List of the Paleozoic life of Oklahoma

This list of the Paleozoic life of Oklahoma contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Oklahoma and are between 541 and 252.17 million years of age.

A

 * †Abludoglyptocrinus
 * †Abyssocrinus
 * †Abyssocrinus antiquus
 * †Abyssomedon – type locality for genus
 * †Abyssomedon williamsi – type locality for species
 * †Acanthobolbina
 * †Acanthobolbina loeblichi
 * †Acanthocladia
 * †Acanthocladia ouachitensis
 * †Acanthocrania
 * †Acanthocrania erecta
 * †Acanthocrania oklahomensis
 * †Acanthocrania subquadrata
 * †Acanthopecten
 * †Acanthopecten grandis – type locality for species
 * †Acanthospirina
 * †Acanthotriletes
 * †Acheloma
 * †Acheloma cumminsi – or unidentified comparable form
 * †Acheloma dunni – type locality for species
 * †Acidiphorus
 * †Acidiphorus williamsi – or unidentified comparable form
 * Acleistorhinus skull illustration cropped.png †[[Acleistorhinus]] – type locality for genus
 * †Acleistorhinus pteroticus – type locality for species
 * †Acolocrinus
 * †Acolocrinus crinerensis
 * †Actinotodissus
 * †Actinotodissus longitaleosus
 * †Adairia
 * †Adairia adairensis – type locality for species
 * †Adornofusa
 * †Adornofusa microhapsis
 * †Aechmina
 * †Aechmina geneae
 * †Aechmina longispina
 * †Aechmina truncata – tentative report
 * †Aechminaria
 * †Aechminaria ambigua
 * †Aechminaria longispina
 * †Aechminaria truncata – tentative report
 * †Aechminella
 * †Aechminella buchanani – type locality for species
 * †Aechminella trispinosa – type locality for species
 * †Affinocrinus
 * †Affinocrinus grandis – type locality for species
 * †Affinocrinus normalis
 * †Affinocrinus orbis – type locality for species
 * †Affinocrinus politus – type locality for species
 * †Affinocrinus progressus – type locality for species
 * †Alatisporites
 * †Alatisporites pustulatus
 * †Albertoceras
 * †Albertoceras minimum
 * †Alcimocrinus
 * †Alcimocrinus girtyi
 * Alethopteris PAMuseum.jpg †[[Alethopteris]]
 * †Alethopteris ambigua
 * †Alethopteris lesquereuxii
 * †Alethopteris serlii
 * †Alethopteris sullivantii
 * †Alexandrinia
 * †Alexandrinia directa – type locality for species
 * †Alisporites
 * †Alisporites aequus – type locality for species
 * †Alisporites zapfei
 * †Allocrinus
 * †Allocrinus divergens
 * †Allocrinus globulus
 * †Allocrinus irroratus
 * †Alloiopteris
 * †Allorisma
 * †Allorisma albequus
 * †Allorisma maynardwhitei – type locality for species
 * †Allorisma snideri – type locality for species
 * †Allotropiophyllum – or unidentified comparable form
 * †Amarixys
 * †Amarixys gracilis
 * †Amaurotoma – tentative report
 * †Amaurotoma knighti – type locality for species
 * †Ameura
 * †Ameura major
 * Ammobaculites
 * Ammodiscus
 * †Ammovertella
 * †Ammovertella inversa
 * †Ampelocrinus
 * †Ampelocrinus convexus
 * †Amphilichas
 * †Amphilichas subpunctatus
 * †Amphipsalidocrinus
 * †Amphiscapha
 * †Amphiscapha catilloides
 * †Amphisella
 * †Amphissites
 * †Amphissites bradfieldi – type locality for species
 * †Amphissites bushi – type locality for species
 * †Amphissites marginiferus
 * †Amphissites miseri – type locality for species
 * †Amphissites nodosus
 * †Amphissites rugosus
 * †Amphissites wapanuckensis
 * †Amphistrophia
 * †Amphistrophia prolongata
 * †Amsdenina
 * †Amsdenoides
 * †Amygdalocystites
 * †Amygdalocystites florealis
 * †Amygdalocystites tribrachiatus
 * †Anabathra
 * †Anabathra pulcherrima
 * †Anachoropteris
 * †Anachoropteris gillotii
 * †Anachoropteris involuta
 * †Anachroropteris
 * †Anachroropteris involuta
 * †Ananaspis
 * †Ananaspis guttulus
 * †Anapiculatasporites
 * †Anapiculatasporites spinosus
 * †Anapiculatisporites
 * †Anapiculatisporites edgarensis
 * †Anapiculatisporites spinosus
 * †Anaplanisporites
 * †Anasobella
 * †Anastrophia
 * †Anastrophia delicata
 * †Anastrophia grossa – type locality for species
 * †Anataphrus
 * †Anataphrus kermiti – type locality for species
 * †Anatiferocystis
 * †Anatiferocystis papillata
 * †Anchicrinus
 * †Anchicrinus echinosacculus – type locality for species
 * †Anchicrinus planulatus – type locality for species
 * †Anchicrinus rugosus
 * †Ancistrorhyncha
 * †Ancistrorhyncha costata
 * †Ancistrorhyncha globularis
 * †Ancoradella
 * †Ancoradella ploeckensis
 * †Anematina
 * †Angelosaurus
 * †Angelosaurus romeri – type locality for species
 * †Anguisporites
 * †Anguisporites contortus – type locality for species
 * †Anguisporites intonsus – type locality for species
 * † Anisophyllum
 * Annularia Stellata.jpg †[[Annularia]]
 * †Annularia sphenophylloides
 * †Annularia stellata
 * †Anobasicrinus
 * †Anobasicrinus obscurus
 * †Anolotichia
 * †Anolotichia deckeri
 * †Anolotichia impolita
 * †Anolotichia spinulifera
 * †Anomalogramma
 * †Anomalogramma parva
 * †Anomalohymen – type locality for genus
 * †Anomalohymen dochmus – type locality for species
 * †Anomalorthis
 * †Anomalorthis oklahomensis
 * †Anomphalus
 * †Anthracoceras
 * †Anthracoceras oklahomense – type locality for species
 * †Anthracocrinus
 * †Anthracocrinus primitivus
 * †Anthraconeilo
 * †Anthraconeilo taffiana
 * †Anthracospirifer
 * †Anthracospirifer opimus
 * †Anthracotarbus – type locality for genus
 * †Anthracotarbus hintoni – type locality for species
 * †Anthyrsis
 * †Antiquatonia
 * †Antirhynchonella
 * †Antirhynchonella thomasi
 * †Anulocrinus
 * †Anulocrinus drummuckensis – or unidentified related form
 * †Apachella
 * †Apachella capertoni – type locality for species
 * †Aparchites
 * †Aparchites maccoyii
 * †Aparchites millepunctatus
 * †Aparchites perforata
 * †Aphlebia
 * †Apianurus
 * †Apiculatasporites
 * †Apiculatasporites latigranifer
 * †Apiculatasporites setulosus
 * †Apiculatasporites spinulistratus
 * †Apodasmocrinus
 * †Apodasmocrinus daubei
 * †Apographiocrinus
 * †Apotocardium
 * †Apotocardium lanterna
 * †Apotocardium plautum
 * †Apsidoneura
 * †Apsidoneura flexa
 * †Arakespongia – type locality for genus
 * †Arakespongia mega – type locality for species
 * †Araucarites
 * †Arbucklecystis
 * Archaeocidaris brownwoodensis MHNT.jpg †[[Archaeocidaris]]
 * †Archaeocidaris megastyla
 * †Archaeocrinus
 * †Archaeocrinus lacunosus – or unidentified comparable form
 * †Archaeocrinus subglobosus
 * †Archaeocrinus subovalis
 * Archaeolithophyllum
 * †Archaeophiomusium
 * †Archaeophiomusium burrisi
 * †Archaeoscyphia
 * †Archaeoscyphia annulata
 * †Archeria
 * †Archeria victori – type locality for species
 * Fenestellidae - Archimedes species.JPG]] †Archimedes''
 * †Archimedes ardmorensis – type locality for species
 * †Archimedes distans
 * †Archimedes meekanoides
 * †Archimedes meekanus – or unidentified comparable form
 * †Archimedes perminimus – or unidentified related form
 * †Archimedes pitkinensis – type locality for species
 * †Archimedes pseudoswallovanus – type locality for species
 * †Archimedes sublaxus – or unidentified comparable form
 * †Ardmosteges – type locality for genus
 * †Ardmosteges orchamus – type locality for species
 * †Arkacrinus
 * †Arkacrinus constrictus – type locality for species
 * †Arkacrinus dubius
 * †Arkanites
 * †Arkanites relictus
 * †Arthropora
 * †Arthropora simplex
 * †Artinska
 * †Artinska clara
 * †Artinska ovata
 * †Asaphocrinus
 * †Asaphocrinus densus
 * †Ascograptus
 * †Asketopalla
 * †Asketopalla formosula
 * †Aspidosaurus – or unidentified comparable form
 * †Astartella
 * †Astartella concentrica
 * †Astartella vera
 * †Asterophyllites
 * †Asthenohymen
 * †Asthenohymen apicalis – type locality for species
 * †Asthenohymen latus – type locality for species
 * †Asthenohymen minutus – type locality for species
 * †Asthenohymen parvulus – type locality for species
 * †Asthenohymen triangularis – type locality for species
 * †Astraeospongium
 * †Astrocystites
 * †Atactoporella
 * †Atactoporella bellula
 * †Atelelasma
 * †Atelelasma oklahomense
 * †Athlocrinus
 * †Athlocrinus dejustus – type locality for species
 * †Athyris
 * †Atokacrinus
 * †Atokacrinus tumulosus – type locality for species
 * †Atrapocrinus – type locality for genus
 * †Atrapocrinus mutatus – type locality for species
 * †Atribonium
 * †Atribonium evexum – or unidentified comparable form
 * Atrypa reticularis pedunculate Gondelsheim CRF.jpg †[[Atrypa]]
 * †Atrypa arctostriata
 * †Atrypa oklahomensis
 * †Atrypa tennesseensis
 * †Atrypina
 * †Atrypina hami
 * †Aulacotheca – or unidentified comparable form
 * †Aurimorpha
 * †Aurimorpha varia
 * †Auriptygma
 * †Austinella
 * †Austinella multicostella
 * Aviculopecten subcardiformis01.JPG †[[Aviculopecten]]
 * †Aviculopecten halensis
 * †Aviculopecten multilineatus
 * †Aviculopecten nodocosta – type locality for species
 * †Aviculopecten tomlinsoni – type locality for species
 * †Avonia – tentative report
 * †Avonia snideri – type locality for species
 * †Avonia spinosa – type locality for species
 * †Axinolobus

B

 * †Bactrites
 * †Bactrites smithianus
 * †Bactrocrinites
 * †Bactrocrinites oklahomensis
 * †Baeotherates – type locality for genus
 * †Baeotherates fortsillensis – type locality for species
 * †Baiosoma
 * †Baiosoma batilia – type locality for species
 * Bairdia
 * †Bairdia ardmorensis – type locality for species
 * †Bairdia billjohnsoni – type locality for species
 * †Bairdia croneisi – type locality for species
 * †Bairdia folgeri
 * †Bairdia forakerensis
 * †Bairdia multihilosa – type locality for species
 * †Bairdiocypris
 * †Bairdocypris – tentative report
 * †Bairdocypris transversus
 * †Balticella
 * †Balticella deckeri
 * †Balticella elongata
 * †Baltisphaeridium
 * †Baltisphaeridium accinctum
 * †Baltisphaeridium bystrentos
 * †Baltisphaeridium disparicanale
 * †Baltisphaeridium parvigranosum
 * †Baltisphaeridium trophirhapium
 * †Barycrinus – tentative report
 * †Barycrinus herculeus – or unidentified related form
 * †Bascomella
 * †Bascomella gigantea – or unidentified comparable form
 * †Bathysiphon
 * †Bathyurellus
 * †Bathyurellus arbucklensis
 * †Bathyurellus inflatus
 * †Bathyurus
 * †Bathyurus superbus
 * †Batostoma
 * †Batostoma chapparsi
 * †Batostoma chazyensis
 * †Batostoma cumingsi
 * †Batostoma ramosa
 * †Batostoma sheldonensis
 * †Batostoma winchelli
 * †Beecheria
 * †Beedeina
 * †Bellazona
 * †Bellazona bella
 * Bellerophon umbilicalis.jpg †[[Bellerophon (genus)|Bellerophon]]
 * †Bellerophon wewokanus
 * †Bellimurina
 * †Bellimurina compressa
 * †Bellimurina subquadrata
 * †Belodella
 * †Belodella silurica
 * †Benthamaspis
 * †Benthamaspis mediacrista – or unidentified comparable form
 * †Benthamaspis onomeris
 * †Benthamaspis rhochmotis
 * †Berestovia
 * †Bicornella
 * †Bicornella tricornis
 * †Bicornella unicornis – type locality for species
 * †Bigalea
 * †Bilinguites
 * †Bilinguites eliasi – type locality for species
 * †Bisatoceras – type locality for genus
 * †Bisatoceras primum – type locality for species
 * †Bistomiacystis
 * †Boesites
 * †Boesites girtyi
 * †Bolbocephalus
 * †Bolbocephalus convexus – or unidentified comparable form
 * †Bolbocephalus jeffersonensis
 * †Bolbocephalus myktos
 * †Bolbocephalus stitti
 * †Bollia
 * Bolosaurus.jpg  †[[Bolosaurus]]
 * †Bolosaurus grandis – type locality for species
 * †Bolosaurus striatus
 * †Bolterpeton – type locality for genus
 * †Bolterpeton carrolli – type locality for species
 * †Borestus
 * †Borestus pagoda – type locality for species
 * †Bothriocidaris
 * †Botryocrinus
 * †Botryocrinus parcus
 * †Botryopteris
 * †Botryopteris forensis
 * †Botryopteris mediatena
 * †Botryopteris tridentata
 * †Brabeocrinus
 * †Brabeocrinus primus – type locality for species
 * †Brachydegma – tentative report
 * †Brachydegma caelatum
 * †Brachymimulus
 * †Brachymimulus americanus
 * †Brachyprion
 * †Brachyprion arata
 * †Brachyprion attenuata
 * †Brachyprion gibber
 * †Brachyprion gibbera – type locality for species
 * †Brachythyris
 * †Brachythyris chouteauensis
 * †Bradyina
 * †Bransonella – type locality for genus
 * †Bransonella tridentata – type locality for species
 * †Breileenia
 * †Breileenia minnewankensis
 * †Brevilamnulella
 * †Brevilamnulella thebesensis
 * †Bromidechinus – type locality for genus
 * †Bromidechinus rimaporus – type locality for species
 * †Bromidella
 * †Bromidella reticulata
 * †Bromidocrinus
 * †Bromidocystis
 * †Buckhornia
 * †Buckhornia carteri
 * †Bumastoides
 * †Bumastoides milleri – or unidentified comparable form
 * †Buxtonia
 * †Buxtonia incurvatus
 * †Buxtonia semicircularis
 * †Buxtonia suttoni – type locality for species
 * Bythocypris
 * †Bythocypris cylindrica
 * †Bythocypris kershavii
 * †Bythocypris spinosa
 * †Bythocypris tomlinsoni
 * †Bythopora
 * †Bythopora subgracilis

C

 * Cacops1DB.jpg †[[Cacops]]
 * †Cacops morrisi – type locality for species
 * †Cacops woehri – type locality for species
 * †Cadiospora
 * †Cadiospora magna
 * †Caenanoplia
 * †Caenanoplia burlingtonensis
 * †Calamaspora
 * †Calamaspora breviradiata – or unidentified comparable form
 * Calamites stems.JPG †[[Calamites]]
 * †Calamospora
 * †Calamospora breviradiata
 * †Calamospora hartungiana
 * †Calamospora liquida
 * †Calamospora mutabilis
 * †Calamospora pedata
 * †Calamospora straminea
 * †Calathium
 * †Calceocrinus
 * †Calceocrinus humilis
 * †Callipteris
 * †Callistophyton
 * †Callistophyton boyssetii
 * †Calohymen – type locality for genus
 * †Calohymen permianus – type locality for species
 * †Calycocrinus
 * †Calycocrinus furnishi – type locality for species
 * †Calycocrinus symmetricus – type locality for species
 * Calymene clavicula dorsal.jpg †[[Calymene]]
 * †Calymene clavicula
 * †Calyptaulax
 * †Calyptaulax annulata
 * †Camarophorella
 * †Camarotoechia
 * †Camarotoechia altisulcata
 * †Camarotoechia carmelensis
 * †Camarotoechia filistriata
 * †Camarotoechia haraganensis
 * †Camarotoechia oklahomensis
 * † Camerate
 * †Camerella
 * †Camerella anteroplicata
 * †Camerella oklahomensis
 * †Camorphoria
 * †Campbelloceras
 * †Cancelloceras
 * †Cancelloceras huntsvillense – type locality for species
 * †Cancrinella
 * †Cancrinella boonensis
 * †Caneyella
 * †Capnophyllum
 * †Captorhinikos
 * †Captorhinikos chozaensis
 * †Captorhinikos parvus – type locality for species
 * †Captorhinikos valensis
 * Captorhinus aguti p.jpg †[[Captorhinus]]
 * †Captorhinus aguti
 * †Captorhinus kierani – type locality for species
 * †Captorhinus laticeps – type locality for species
 * †Captorhinus magnus – type locality for species
 * †Carabocrinus
 * †Carabocrinus loeblichi
 * †Carabocrinus logani
 * †Carabocrinus treadwelli
 * †Carabocrinus tumidus
 * †Carabocrinus vancortlandi – or unidentified comparable form
 * †Carbonocoryphe
 * †Carbonocoryphe planucauda
 * †Carboprimitia
 * †Carboprimitia rotunda – or unidentified comparable form
 * Cardiocephalus peabodyi.jpg †[[Cardiocephalus]]
 * †Cardiocephalus peabodyi – type locality for species
 * †Cardiocephalus sternbergi – or unidentified comparable form
 * †Cardiodella
 * †Cardiodella abbreviatus
 * †Cardiodella arcuatus
 * †Cardiodella densus
 * †Cardiodella robustus
 * †Carolinites
 * †Carolinites sibiricus
 * †Caryocaris – tentative report
 * †Caryocrinites
 * †Cavellina
 * †Cavellina lata
 * †Cavellina subovata
 * †Cavernula
 * †Cavernula coccidia
 * †Cavernula pediculata
 * †Centrotarphyceras
 * †Centrotarphyceras powersi
 * †Ceramopora
 * †Ceramopora unapensis
 * †Ceramoporella
 * †Ceramoporella ingenua
 * †Ceratiocaris
 * †Ceratocephala
 * †Ceratocephala graffhami
 * †Ceratonurus
 * †Ceratopea
 * †Ceraurinella
 * Ceraurus fossil cropped.png †[[Ceraurus]]
 * †Ceraurus ruidus
 * †Cerithioides – tentative report
 * †Cerithioides gleanensis
 * †Chaenocardia
 * †Chaenocardia ovata
 * †Chaetetes
 * †Chaetetes milleporaceus – or unidentified comparable form
 * †Chaloneria
 * †Champlainopora
 * †Champlainopora chazyensis
 * †Chapmania
 * †Chapmania carterensis
 * †Chapmania oklahomensis
 * †Chapmania taylori
 * †Chaulistomella
 * †Chaulistomella crassa
 * †Chaulistomella magna
 * †Chaulistomella mira
 * †Chaulistomella mundula
 * †Chaulistomella nitens
 * †Chaulistomella obesa
 * †Cheirocrinus
 * †Cheirocystis
 * †Cheirocystis ardmorensis
 * Trilobite Ordovicien 8127.jpg †[[Cheirurus]]
 * †Cheirurus infensus
 * †Cheirurus phollikodes – type locality for species
 * †Chilotrypa
 * †Chilotrypa distans – type locality for species
 * †Chlidochirus
 * †Choctawites
 * †Choctawites choctawensis
 * †Chonetes
 * †Chonetes decipiens
 * †Chonetes euampygus
 * †Chonetes kingi – type locality for species
 * †Chonetes mesoloba
 * †Chonetinella
 * †Chonetinella flemingi – or unidentified comparable form
 * †Cibecuia
 * †Cibecuia gouldii
 * †Cibolocrinus
 * †Cibolocrinus bellus – type locality for species
 * †Cibolocrinus circulus – type locality for species
 * †Cibolocrinus spinosus – type locality for species
 * †Cibolocrinus tumidus
 * †Cirratriradites
 * †Cirratriradites annulatus
 * †Cirratriradites annuliformis
 * †Cirratriradites maculatus
 * †Cirratriradites saturnii
 * Cladochonus coral KGS.jpg †[[Cladochonus]]
 * †Claritacarpus – type locality for genus
 * †Claritacarpus smithi – type locality for species
 * †Clarkeolepis – type locality for genus
 * †Clarkeolepis clarkei – type locality for species
 * †Clarkeolepis elegans – type locality for species
 * †Clathrocrinus
 * †Clathrocrinus grileyi – type locality for species
 * †Clavasporites – type locality for genus
 * †Clavasporites irregularis – type locality for species
 * †Clavatasporites
 * †Clavatasporites irregularis
 * †Cleiocrinus
 * †Cleiocrinus bromidensis – type locality for species
 * †Cleiocrinus regius
 * Cleiothyridina sublamellosa pedunculate valve.jpg †[[Cleiothyridina]]
 * †Cleiothyridina glenparkensis – or unidentified comparable form
 * †Cleiothyridina orbicularis
 * †Cleithronetrum
 * †Cleithronetrum cancellatum
 * †Cleithyridina
 * †Cleithyridina orbicularis
 * †Clepsydrops
 * †Climacammina
 * Cliona
 * †Cliona fenestralis – type locality for species
 * †Cliona paleodendrica – type locality for species
 * †Cliona stellata – type locality for species
 * †Clionolithes
 * †Clionolithes radicans – or unidentified comparable form
 * †Coelochilina
 * †Coelochilina alata
 * †Coelospira
 * †Coelospira concava
 * †Coelospira saffordi
 * †Coelospira virginia
 * †Colaptomena
 * †Colaptomena bella
 * †Coledium
 * †Coledium simulans
 * Colobomycter1.png †[[Colobomycter]] – type locality for genus
 * †Colobomycter pholeter – type locality for species
 * †Colobomycter vaughni – type locality for species
 * †Colpodecrinus
 * †Complexisporites
 * †Complexisporites polymorphus
 * †Composita
 * †Composita mexicana
 * †Composita rotunda
 * †Composita subcircularis
 * †Composita subtilita
 * †Composita wasatchensis
 * Concavisporites
 * †Concavissimisporites
 * †Condracypris
 * †Condracypris binoda
 * †Condracypris coalensis – type locality for species
 * †Condracypris parallela
 * †Condracypris simplex
 * †Condranema
 * †Condranema magna – or unidentified comparable form
 * †Conularia
 * †Conularia crustula – or unidentified comparable form
 * †Coolinia
 * †Coolinia reedsi
 * †Cordania
 * †Cordania falcata
 * †Cordania wessmani
 * †Cordylodus
 * †Cornigella
 * †Cornigella pushmatahensis – type locality for species
 * †Cornulites
 * †Cornulites inelegans
 * Cornuspira
 * †Cornuspira semiconstrictus
 * Cotylorhynchus romeria from Norman, Oklahoma.jpg   †[[Cotylorhynchus]] – type locality for genus
 * †Cotylorhynchus bransoni – type locality for species
 * †Cotylorhynchus romeri – type locality for species
 * †Cranaena
 * †Cranaena globosa
 * †Cranaena salinensis – type locality for species
 * Crania
 * †Crania minuta – type locality for species
 * †Craniops
 * †Craniops tenuis
 * †Crassispora
 * †Crassispora kosankei
 * †Cravenoceras
 * †Cremacrinus
 * †Cricotillus
 * †Cricotillus brachydens
 * Cricotus heteroclitus Cope.jpg †[[Cricotus]]
 * †Cricotus crassidiscus
 * †Crinerocrinus
 * †Crinisarina
 * †Crinisarina prouti
 * †Crinoedischia
 * †Crinoedischia noblensis – type locality for species
 * †Cromyocrinus
 * †Cromyocrinus grandis
 * †Crossotelos – type locality for genus
 * †Crossotelos annulatus – type locality for species
 * †Crurithyris
 * †Crurithyris planoconvexa
 * †Cruruthyris
 * †Cruruthyris planoconvexa
 * †Crustaesporites
 * †Crustaesporites globulus – tentative report
 * †Cryptophyllus
 * †Cryptophyllus gibbosum
 * †Cryptophyllus nuculopsis
 * †Cryptophyllus simpsoni
 * †Cryptothyrella – tentative report
 * †Cryptothyrella ovoides
 * Ctenacanthus major Agassiz.png †[[Ctenacanthus]] – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Ctenobolbina
 * †Ctenobolbina abrupta
 * †Ctenobolbina bispinata
 * †Ctenobolbina cancellata
 * †Ctenobolbina inflata
 * †Ctenobolbina parva
 * †Ctenobolbina percarinata
 * †Ctenobolbina varicata
 * †Cullisonia
 * †Cullisonia producta
 * †Curtognathus
 * †Curtognathus cordiformis
 * †Curtognathus coronata
 * †Curtognathus limitaris
 * †Cyathocystis
 * †Cyathocystis oklahomae
 * †Cybeloides
 * †Cybelopsis
 * †Cycadopites
 * †Cyclites
 * †Cyclites depressus – type locality for species
 * †Cyclobathmus
 * †Cyclobathmus haworthi – type locality for species
 * †Cycloceras
 * †Cycloceras meeki – type locality for species
 * †Cycloceras randolphensis
 * †Cyclocystoides
 * †Cyclogranisporites
 * †Cyclogranisporites aureus
 * †Cyclogranisporites leopoldi
 * †Cyclogranisporites microgranus
 * †Cyclogranisporites minutus
 * †Cyclogranisporites obliquus
 * †Cyclogranisporites orbicularis
 * †Cyclonema
 * †Cycloplectoceras
 * †Cycloplectoceras miseri
 * Cyclopteris fossil cropped.png †[[Cyclopteris]]
 * †Cyclopuncta – type locality for genus
 * †Cyclopuncta girtyi – type locality for species
 * †Cyclospira
 * †Cyclospira parva
 * †Cyclozyga
 * †Cyclozyga neotenica – type locality for species
 * †Cymatorhiza – type locality for genus
 * †Cymatorhiza kittsi – type locality for species
 * †Cymatospira
 * †Cymatospira montfortianus
 * Cyphaspis fossil cropped.png †[[Cyphaspis]]
 * †Cyphaspis carrolli
 * †Cyphoneurodes
 * †Cyphoneurodes patriciae – type locality for species
 * †Cypricardella – tentative report
 * †Cypricardella enigmatica – type locality for species
 * †Cyrtina
 * †Cyrtina dalmani
 * †Cyrtograptus
 * †Cyrtorizoceras
 * †Cystiphyllum
 * †Cystodictya
 * †Cystodictya elegans – type locality for species

D

 * †Dactylogonia
 * †Dactylogonia sculpturata
 * †Dactylogonia subaequicostellata
 * †Dalejina
 * †Dalejina henryhousensis
 * †Dalejina subtriangularis
 * †Dalmanella
 * †Dalmanella edgewoodensis
 * SilurianTrilobite.jpg †[[Dalmanites]]
 * †Dalmanites ptyktorhion
 * †Dalmanites rutellum
 * †Dapsilodus
 * †Dapsilodus obliquicostatus
 * †Dapsilodus praecipuus
 * †Dapsilodus sparsus
 * †Decoriconus
 * †Decoriconus fragilis
 * †Decoroproetus
 * †Decoroproetus anaglyptus
 * †Decoroproetus corycoeus
 * †Dekayella
 * †Dekayella praenuntia
 * †Delocrinus
 * †Delocrinus densus
 * †Delocrinus hemisphericus
 * †Delocrinus pentanodus – type locality for species
 * †Deloia
 * †Deloia sulcata
 * †Delopsocus
 * †Delopsocus elongatus
 * †Delopterum
 * †Delopterum latum
 * †Delopterum minutum
 * Delorhynchus cifellii cropped.png †[[Delorhynchus]] – type locality for genus
 * †Delorhynchus cifellii – type locality for species
 * †Delorhynchus priscus – type locality for species
 * †Delotaxis
 * †Delthyris
 * †Delthyris kozlowskii
 * †Deltoidospora
 * †Deltoidospora adnata
 * †Deltoidospora grandis
 * †Deltoidospora levis
 * †Deltoidospora priddyi
 * †Deltoidospora sphaerotriangula
 * †Deltoidospora subadnatoides
 * †Dendrocrinus
 * †Dendrocrinus latibranchiatus – or unidentified comparable form
 * †Dendrocrinus rusticus
 * †Densosporites
 * †Densosporites sphaerotriangularis
 * †Derbyia
 * †Derbyia crassa – or unidentified comparable form
 * †Derbyoides – or unidentified related form
 * †Desmoinesia
 * †Desmoinesia muricatina
 * †Desmorthis
 * †Diabolocrinus
 * †Diacalymene
 * †Diacalymene clavicula
 * Diadectes phaseolinus.JPG  †[[Diadectes]]
 * †Diadectes zenos
 * †Dianulites
 * †Dianulites fastigiatus
 * †Dianulites petropolitana
 * †Diaphoroceras
 * †Diaphorodendron
 * †Diaphorodendron dicentricum
 * †Diaphorodendron scleroticum
 * †Diaphragmus
 * †Diaphragmus fasciculatus
 * †Dibunophyllum
 * †Dibunophyllum hansoni – type locality for species
 * †Dicamaropsis
 * †Dicamaropsis parva
 * †Dicellograptus
 * †Dicellograptus gurleyi
 * †Dicellograptus mensurans
 * †Diceromyonia
 * †Diceromyonia tersa – or unidentified comparable form
 * †Dichentomum
 * †Dichentomum tinctum
 * †Dichognathus
 * †Dichognathus extensa
 * †Dichognathus typica
 * †Dicoelosia
 * †Dicoelosia oklahomenesis – type locality for species
 * †Dicoelosia oklahomensis
 * †Dicoelosia varica
 * †Dicranella
 * †Dicranella fragilis
 * †Dicranella macrocarinata
 * [[File:Dicranurus hamatus elegantus, Early Devonian, Haragan Formation, Coal County, Oklahoma, USA - Houston Museum of Natural Science - DSC01680.JPG|thumb|upright|Dicranurus]] †[[Dicranurus]]
 * †Dicranurus elegantus
 * †Dicranurus hamatus
 * †Dicromyocrinus
 * †Dicromyocrinus medius – type locality for species
 * †Dicromyocrinus optimus
 * †Dicromyocrinus subaplatus – type locality for species
 * †Dictybolos – type locality for genus
 * †Dictybolos tener – type locality for species
 * †Dictyoclostus
 * †Dictyoclostus ingrata – or unidentified related form
 * †Dictyoclostus mesialis
 * †Dictyonema
 * †Dictyonema francesiae
 * †Dictyonema rockcrossingensis
 * †Dictyospongia
 * †Dielasma
 * †Dielasma oklahomensis – type locality for species
 * †Dierespongia – type locality for genus
 * †Dierespongia palla – type locality for species
 * †Dimeropygiella
 * Dimetrodon8DB.jpg †[[Dimetrodon]]
 * †Dimetrodon dollovianus
 * †Dimetrodon limbatus – or unidentified comparable form
 * †Dimetrodon loomisi
 * †Dimetrodon macrospondylus
 * †Diphuicrinus
 * †Diphuicrinus croneisi
 * †Diphuicrinus dovelyensis
 * †Diphuicrinus faustus – type locality for species
 * †Diphuicrinus mammifer – type locality for species
 * †Diphuicrinus pentanodus – type locality for species
 * Exhibit Museum of Natural History, Ann Arbor - IMG 9136.JPG †[[Diplocaulus]] – type locality for genus
 * †Diplocaulus magnicornis
 * †Diplocaulus parvus – type locality for species
 * †Diplocaulus primus – type locality for species
 * †Diplograptus
 * †Diplograptus maxwelli
 * †Diplothmema
 * †Diplothmema pachyderma
 * †Diplotrypa
 * †Diplotrypa bassleri
 * †Discitoceras
 * †Disparifusa
 * †Disparifusa hystricosa
 * †Distacodus
 * †Distacodus oklahomensis – type locality for species
 * †Ditaxineura
 * †Ditaxineura cellulosa
 * †Ditoecholasma
 * †Ditomopyge
 * †Ditomopyge parvulus – or unidentified comparable form
 * †Dizygopleura
 * †Doleotheca
 * †Doleroides
 * †Doleroides compressus
 * †Doleroides oklahomensis
 * †Doleroides vescus
 * †Dolerophyllum – tentative report
 * †Dolerorthis
 * †Dolerorthis hami
 * †Dolerorthis nanella
 * †Dolerorthis savagei
 * †Doleserpeton – type locality for genus
 * †Doleserpeton annectens – type locality for species
 * †Dolichoharpes
 * †Dolichoharpes reticulata
 * †Doliocrinus
 * †Domatoceras
 * †Domatoceras collinsvillense – type locality for species
 * †Domatoceras williamsi
 * †Donaldina
 * †Donaldina attenuata
 * †Donaldina grantonensis
 * †Donezella
 * †Donovaniconus
 * †Donovaniconus oklahomensis – type locality for species
 * †Drepanoistodus
 * †Drepanoistodus suberectus
 * †Dudleyaspis
 * †Dunbarites
 * †Dunbarites rectilateralis
 * †Dunbarites wewokensis – type locality for species
 * †Duncanella

E

 * †Earlandinita
 * †Eatonia
 * †Eatonia exserta
 * †Ecculiomphalus – tentative report
 * †Echinaria
 * †Echinoconchus
 * †Echinoconchus elegans
 * †Echinocrinus
 * †Echinocrinus cratis – or unidentified related form
 * †Echinoencrinites – tentative report
 * †Echinoencrinites ornatus
 * †Echinoprimitia
 * †Echinoprimitia imputata
 * Echinosphaerites.JPG †[[Echinosphaerites]]
 * †Echinosphaerites aurantium
 * †Economolopsis
 * †Economolopsis anodontoides
 * †Ectenaspis
 * †Ectenaspis burkhalteri – type locality for species
 * †Ectenocrinus
 * †Ectenoglossa – tentative report
 * †Ectenoglossa sculpta
 * †Ectosteorhachis
 * †Ectosteorhachis nitidus – or unidentified comparable form
 * Edaphosaurus-cruciger jconway cropped.jpg †[[Edaphosaurus]]
 * †Edaphosaurus cruciger
 * †Edestus – type locality for genus
 * †Edestus vorax – type locality for species
 * †Edmondia
 * †Edmondia rotunda – type locality for species
 * †Edmondia senilis – or unidentified comparable form
 * †Edmondia splendens – type locality for species
 * †Edriocrinus
 * †Edriophus
 * †Ehlersia
 * †Elibatocrinus
 * †Elibatocrinus elongatus – or unidentified comparable form
 * †Elmoa
 * †Elmoa trisecta
 * †Elpidocrinus
 * †Elpidocrinus tuberosus
 * †Embolaster – type locality for genus
 * †Embolaster graffhami – type locality for species
 * †Emilites
 * †Emilites bennisoni – type locality for species
 * †Enchostoma – tentative report
 * †Enchostoma bicarinatum – or unidentified comparable form
 * †Endelocrinus
 * †Endelocrinus matheri
 * †Endosporites
 * †Endosporites globiformis
 * †Endosporites plicatus
 * †Endosporites zonalis
 * †Endothyra
 * †Endothyra bowmani
 * †Endothyranella
 * †Enteletes
 * †Entelophyllum
 * †Enterolasma
 * †Eoasianites
 * †Eochiton
 * †Eochiton arbucklensis – type locality for species
 * †Eochonetes
 * †Eochonetes magna
 * †Eodictyonella (formerly Dictyonella)
 * †Eodictyonella gibbosa
 * †Eohippioceras
 * †Eohippioceras ferratum
 * †Eohollina
 * †Eohollina depressa
 * †Eohollina papillata
 * †Eoleperditia
 * †Eoleperditia fabulites
 * †Eoleperditia inflativentralis
 * †Eolissochonetes
 * †Eomartiniopsis
 * †Eomartiniopsis rostrata
 * †Eomonorachus
 * †Eomonorachus divaricatus
 * †Eopinnacrinus
 * †Eopleurophorus – type locality for genus
 * †Eopleurophorus immaturus
 * †Eopleurophorus spinulosa – or unidentified comparable form
 * †Eoprimitia
 * †Eoprimitia bailyana
 * †Eoprimitia cooperi
 * †Eoprimitia quadrata
 * †Eoprimitia subnodosa
 * †Eorobergia
 * †Eorobergia marginalis – or unidentified comparable form
 * †Eoschistoceras
 * †Eoschistoceras strawnense
 * †Eospirifer
 * †Eospirifer acutolineatus
 * †Eotomaria
 * †Ephedripites
 * †Ephedripites corrugatus – type locality for species
 * †Epiphyton
 * †Equisetites
 * †Equisetosporites
 * †Eridoconcha
 * †Eridoconcha magna
 * †Eridoconcha simpsoni
 * †Eridopora
 * †Eridopora radiata
 * †Eridopora stellata
 * †Eridotrypa
 * †Eridotrypa abrupta
 * †Erismodus – tentative report
 * †Erisocrinus
 * †Erisocrinus wapanucka
 * Eryops1DB.jpg †[[Eryops]]
 * †Eryops megacephalus
 * †Escharopora
 * †Escharopora recta
 * †Estheria
 * †Ethelocrinus – tentative report
 * †Ethelocrinus kirki
 * CrinoidHoldfastRoots.JPG †[[Eucalyptocrinites]]
 * †Eucalyptocrinites pernodosus
 * †Euchondria
 * †Euchondria subquadrata – type locality for species
 * †Eucraterellina
 * †Eucraterellina oblonga
 * †Eucraterellina randolphi
 * †Eucraterellina spitznasi
 * †Eucystis
 * †Eudissoceras – type locality for genus
 * †Eudissoceras collinsvillense – type locality for species
 * †Eukloedenella
 * †Eumartynovia – type locality for genus
 * †Eumartynovia raaschi – type locality for species
 * †Eumetria
 * †Eumetria deltoides – type locality for species
 * †Eumetria matheri – type locality for species
 * †Eumetria vera
 * †Eumetria verneuiliana
 * †Eumorphoceras
 * †Eumorphoceras bisulcatum
 * †Eumorphoceras girtyi
 * †Eumorphocystis
 * †Eumorphocystis multiporata
 * †Euonychocrinus
 * †Eupachycrinus
 * †Eupachycrinus magister – or unidentified comparable form
 * †Eupachycrinus verrucosus
 * †Euphemites
 * †Euphemites carbonarius
 * †Euphemites compressus – type locality for species
 * †Eurychilina
 * †Eurychilina papillata
 * †Eurychilina subradiata
 * †Eurychilina ventrosa
 * †Eurygonum
 * †Eurygonum nodosum
 * †Euryodus
 * †Euryodus dalyae – type locality for species
 * †Euryodus primus – or unidentified comparable form
 * †Eusphenopteris
 * †Eusphenopteris scribanii-striata – informal
 * †Euspirocrinus
 * †Euspirocrinus cirratus
 * †Exocrinus
 * †Exoriocrinus

F

 * †Failleana
 * †Failleana limbata – or unidentified comparable form
 * †Falcisporites
 * †Falcisporites zapfei
 * †Fardenia
 * †Fardenia attenuata
 * †Fardenia reedsi
 * †Fascichnus
 * †Fascichnus dactylus
 * †Fascichnus frutex
 * †Fascifera
 * †Fascifera dalmanelloidea
 * †Fastigatisporites
 * †Fastigatisporites physema – type locality for species
 * †Favosites
 * †Fayella – type locality for genus
 * †Fayella chickashaensis – type locality for species
 * Feeserpeton cropped.png †[[Feeserpeton]] – type locality for genus
 * †Feeserpeton oklahomensis – type locality for species
 * †Fenestella
 * †Fenestella ardmorensis
 * †Fenestella bendensis – type locality for species
 * †Fenestella cestriensis
 * †Fenestella chesterensis – or unidentified comparable form
 * †Fenestella cumingsi
 * †Fenestella exigua
 * †Fenestella frutex – or unidentified comparable form
 * †Fenestella granularis – type locality for species
 * †Fenestella kosomensis – type locality for species
 * †Fenestella morrowensis
 * †Fenestella oklahomensis – type locality for species
 * †Fenestella ovatipora – type locality for species
 * †Fenestella paradisensis
 * †Fenestella rara – type locality for species
 * †Fenestella serratula
 * †Fenesteverta – type locality for genus
 * †Fenesteverta nicklesi – type locality for species
 * †Fernglenia
 * †Fernglenia vernonensis
 * †Finkelnburgia
 * †Finkelnburgia crassicostata
 * †Fistulipora
 * †Flexifenestella
 * †Flexifenestella grandis – type locality for species
 * †Florinites
 * †Florinites mediapudens
 * †Florinites millotti
 * †Florinites similis
 * †Florinites visendus
 * †Florinites volans
 * †Foerstediscus
 * †Foerstia
 * †Foerstia ohioensis
 * †Fragiscutellum
 * †Fragiscutellum glebalis
 * †Fragiscutum
 * Frencrinuroides capitonis roled dorsal.jpg †[[Frencrinuroides]]
 * †Frencrinuroides capitonis
 * †Fusulina

G

 * †Galateacrinus
 * †Gardenasporites
 * †Gardenasporites heisselii
 * †Garwoodia
 * †Gastrioceras
 * †Gastrioceras adaense
 * †Gastrioceras fittsi
 * †Gastrioceras prone – type locality for species
 * †Gastrioceras retiferum – type locality for species
 * †Gazacrinus
 * †Gazacrinus stellatus
 * †Gelasinocephalus
 * †Gelasinocephalus pustulosus
 * †Gelasinocephalus whittingtoni
 * †Geniculifera
 * †Geniculifera siphuncula – type locality for species
 * †Gigagramma – type locality for genus
 * †Gigagramma carpenteri – type locality for species
 * †Gigantopteris
 * †Gigantopteris americana
 * †Girtycoelia
 * †Girtyella
 * †Girtyspira
 * †Girtyspira alvaensis – type locality for species
 * †Girvanella
 * †Gissocrinus
 * †Gissocrinus quadratus
 * †Glabovalvulina – tentative report
 * †Glabrocingulum
 * †Glabrocingulum grayvillense
 * †Glabrocingulum stellaeformis
 * †Glabrocingulum wannense – type locality for species
 * †Glaphurochiton
 * †Glaphyrites
 * †Glaphyrites angulatus
 * †Glaphyrites excelsus – type locality for species
 * †Glaphyrites hyattianus
 * †Glaphyrites subdiscus
 * †Glaphyrites warei – type locality for species
 * †Glaphyrophlebia
 * †Glaphyrophlebia anderhalterorum – type locality for species
 * †Glaukosocrinus
 * †Globivalvulina
 * †Globovalvulina
 * †Globulocystites
 * †Globulocystites cristatus
 * †Globulocystites infundus
 * †Glosella
 * †Glosella liumbona
 * †Gloverilima
 * †Gloverilima pratti
 * †Glymmatobolbina
 * †Glymmatobolbina quadrata
 * †Glyprorthis
 * †Glyprorthis costellata
 * †Glyptocystella
 * †Glyptocystella loeblichae
 * †Glyptocystites
 * †Glyptocystites forbesi
 * †Glyptocystites loeblichae
 * †Glyptocystites logani
 * †Glyptocystites multiporus
 * †Glyptocystites regnelli – or unidentified comparable form
 * †Glyptopleura
 * †Glyptopleura geisi – type locality for species
 * †Glyptopleura scotti – type locality for species
 * †Glyptopleura warthini – type locality for species
 * †Glyptorthis
 * †Glyptorthis crenulata – type locality for species
 * †Glyptorthis glaseri
 * †Glyptorthis obesa – type locality for species
 * †Glyptorthis uncinata – type locality for species
 * †Gnathodus
 * GnathorhizaDB.jpg †[[Gnathorhiza]]
 * †Gnathorhiza serrata
 * †Gnetalesaccus
 * †Gnetalesaccus variabilis
 * †Gnorimocrinus
 * †Gnorimocrinus pontotocensis
 * †Goniasma
 * Goniatitidae - Goniatites species.JPG †[[Goniatites]]
 * †Goniatites multiliratus – type locality for species
 * †Gonioglyphioceras
 * †Gonioglyphioceras gracile
 * †Gonioloboceratoides
 * †Goniophora
 * †Gorgonisphaeridium
 * †Gorgonisphaeridium antiquum
 * †Gotlandochiton
 * †Gotlandochiton hami – type locality for species
 * †Graffhamicrinus
 * †Graffhamicrinus antiquus
 * †Grammolomatella
 * †Granasporites
 * †Granasporites medius
 * †Grandfieldia – type locality for genus
 * †Grandfieldia callilepidota – type locality for species
 * †Granulatisporites
 * †Granulatisporites granularis
 * †Granulatisporites granulatus
 * †Granulatisporites microgranifer
 * †Granulatisporites minutus
 * †Granulatisporites verrucosus
 * †Graptodictya
 * †Graptodictya elegantula
 * †Griffithidella
 * †Griffithidella alternata
 * †Griffithidella doris
 * †Gryphellina
 * †Gryphellina sellardsi – type locality for species
 * †Grypocrinus
 * †Gyalorhethium
 * †Gyalorhethium chondrodes
 * [[File:Gymnophyllum wardi - National Museum of Nature and Science, Tokyo - DSC07730 cropped.jpg|thumb|upright=0.702|Fossils of the Carboniferous coral Gymnophyllum, also known as button coral]] †[[Gymnophyllum]]
 * †Gymnophyllum wardi
 * †Gypidula
 * †Gypidula multicostata
 * †Gyronema

H

 * †Hagnocrinus
 * †Halliella
 * †Halliella labiosa
 * Hallopora multitabulata fossil bryozoan (Ordovician; Frankfort IL.jpg †[[Hallopora]]
 * †Hallopora dubia
 * †Hallopora macrostoma
 * †Hallopora multitabulata
 * †Hallopora pachymura
 * †Halysites
 * †Hamiapollenites – type locality for genus
 * †Hamiapollenites karrooensis
 * †Hamiapollenites saccatus – type locality for species
 * †Hamiapollenites tractiferinus
 * †Haplistion
 * †Haplistion apletum – type locality for species
 * †Hapsidopareion – type locality for genus
 * †Hapsidopareion lepton – type locality for species
 * †Harpidella
 * †Harpidella butorus
 * †Harpillaenus
 * †Healdia
 * †Healdia caneyensis
 * †Healdia compressa
 * †Healdia harltoni – type locality for species
 * †Healdia simplicissima – type locality for species
 * †Hebetorthoceras
 * †Hebetorthoceras brokenarrowense
 * †Heliolites
 * †Heliosocrinus
 * †Heliosocrinus neotosus – type locality for species
 * †Helminthochiton
 * †Helminthochiton riddlei
 * †Hemiliroceras
 * †Hemiliroceras reticulatum – type locality for species
 * †Hemiphragma
 * †Hemiphragma irrasum
 * †Hemiphragma pulchra
 * †Hesperocystis
 * †Hesperocystis deckeri
 * †Hesperorthis
 * †Hesperorthis crinerensis
 * †Hesperorthis rowlandi
 * †Hesperorthis sulcata
 * †Heterangium
 * †Heteropecten
 * †Heteropecten vanvleeti – type locality for species
 * †Heterotrypa
 * †Heterotrypa taffi
 * †Hexacrinites
 * †Hexacrinites adaensis
 * †Hexacrinites carinatus
 * †Hibbertia
 * †Hindia
 * †Hindiodella
 * †Hippocrepina
 * †Hippocrepina bendensis
 * †Hiscobeccus
 * †Hiscobeccus capax
 * †Hoffmeisterites – type locality for genus
 * †Hoffmeisterites microdens – type locality for species
 * †Holcospermum
 * †Hollinella
 * †Hollinella burlingamensis
 * †Hollinella radiata
 * †Holmesella
 * †Holmesella triangularis – type locality for species
 * †Holmesella wapanuckensis – type locality for species
 * Holopeidae - Holopea praestans.JPG †[[Holopea]] – tentative report
 * †Homocladus
 * †Homocladus grandis
 * †Homoeospira
 * †Homoeospira costatula
 * †Homoeospira foerstei
 * †Homoeospira subgibbosa
 * †Homotrypa
 * †Homotrypa callitoecha
 * †Homotrypa dickeyvillensis
 * †Homotrypa multitabulata
 * †Homotrypa sagittata
 * †Homotrypa tuberculata
 * †Homotrypa ulrichi
 * †Hormotoma
 * †Howellella
 * †Howellella cycloptera
 * †Howellella henryhousensis
 * †Howellella splendens
 * †Hudsonaster
 * †Huntonella – type locality for genus
 * †Huntonella unicornis – type locality for species
 * Huntoniatonia oklahomae CRF 1.jpg †[[Huntoniatonia]]
 * †Huntoniatonia huntonensis
 * †Huntoniatonia lingulifer
 * †Huntoniatonia oklahomae
 * †Huntoniatonia purduei
 * †Hustedia
 * †Hustedia mormoni – or unidentified comparable form
 * †Hybocrinus
 * †Hybocrinus conicus
 * †Hybocrinus crinerensis
 * †Hybocrinus nitidus
 * †Hybocrinus pyxidatus
 * †Hydreionocrinus
 * †Hydreionocrinus patulus
 * Hyperammina
 * †Hyperammina elongata
 * †Hyperammina johnsvalleyensis – type locality for species
 * †Hyperammina rugosa
 * †Hyperamminoides
 * †Hyperamminoides glabra
 * †Hyperchilarina
 * †Hyperchilarina nodosimarginata
 * †Hypergonia
 * †Hypergonia quadricarinata – or unidentified comparable form
 * †Hypergonia tatei – or unidentified related form

I

 * †Ianthinopsis
 * †Icthyocrinus
 * †Icthyocrinus corbis
 * †Idiognathodus
 * †Idiognathodus delicates
 * †Idiognathodus sinuatus
 * Illaenidae - Illaenus tauricornis.JPG †[[Illaenus]]
 * †Illaenus utahensis – or unidentified comparable form
 * †Illenites
 * †Illenites delasaucei
 * †Illenites parvus
 * †Inflatia
 * †Inflatia cherokeensis
 * †Inflatia clydensis
 * †Inflatia cooperi
 * †Inflatia gracilis
 * †Inflatia inflata
 * †Inflatia pusilla
 * †Inflatia succincta – type locality for species
 * †Ischyrotoma
 * †Ischyrotoma sila
 * †Isoallagecrinus
 * †Isoallagecrinus barnettensis – type locality for species
 * †Isochilina
 * †Isochilina bulbosa
 * †Isorthis
 * †Isorthis arcuaria
 * †Isorthis pygmaea
 * †Isoteloides
 * †Isoteloides peri
 * Isotelus brachycephalus.JPG †[[Isotelus]]
 * †Isotelus bradleyi – type locality for species
 * †Isotelus violaensis – type locality for species
 * †Ivanovia – tentative report
 * †Ivoechiton
 * †Ivoechiton calathicolus – type locality for species
 * †Ivoechiton oklahomensis – type locality for species

J

 * †Janusella
 * †Janusella biceratina
 * †Jeffersonia
 * †Jeffersonia granosa
 * †Jeffersonia jenni
 * †Jeffersonia ulrichi
 * †Jonesina
 * †Jonesina spinigera – or unidentified comparable form
 * †Jonesites
 * †Jonesites circa
 * †Jonesites huntonensis – type locality for species
 * †Juresania

K

 * Kainops invius lateral and ventral.JPG †[[Kainops]]
 * †Kainops invius
 * †Kainops raymondi
 * †Kallimorphocrinus
 * †Kallimorphocrinus eaglei – type locality for species
 * †Kawina
 * †Kayina
 * †Kayina hybosa
 * †Kayina porosa
 * †Kennedya
 * †Kennedya fraseri – type locality for species
 * †Kennedya mirabilis
 * †Keokukia
 * †Keokukia sulcata
 * †Kettneraspis
 * †Kettneraspis williamsi
 * †Kirkbya
 * †Kirkbya bendensis – type locality for species
 * †Kirkbya moorei
 * †Kirkbya symmetrica
 * †Kirkbyella
 * †Kirkbyella obliqua
 * †Kirkidium
 * †Kirkocystis – type locality for genus
 * †Kirkocystis papillata – type locality for species
 * †Kitakamithyris
 * †Kitakamithyris cooperensis
 * †Klausipollenites
 * †Klausipollenites aequus
 * †Klausipollenites schaubergeri
 * †Knightites
 * †Knightites montfortianum
 * †Knightoceras
 * †Knightoceras patulum
 * †Kockelella
 * †Kockelella amsdeni
 * †Kockelella crassa
 * †Kockelella ortus
 * †Kockelella patula
 * †Kockelella ranuliformis
 * †Kockelella stauros
 * †Kockelella variabilis
 * †Kockelella walliseri
 * †Kosovopeltis
 * †Kozlowskia
 * †Kozlowskia splendens
 * †Kozlowskiellina
 * †Kozlowskiellina vaningeni
 * †Krausella
 * †Krausella arcuata
 * †Krotovia
 * †Kukalova – type locality for genus
 * †Kukalova americana – type locality for species

L

 * †Labidosaurikos – type locality for genus
 * †Labidosaurikos meachami – type locality for species
 * Labidosaurus.jpg †[[Labidosaurus]]
 * †Labiisporites
 * †Labiisporites granulatus
 * †Laeviatosporites
 * †Laeviatosporites ovalis
 * Laevidentalium
 * †Laevidentalium venustum – or unidentified comparable form
 * †Laevigatosporites
 * †Laevigatosporites desmoinesensis
 * †Laevigatosporites globosus
 * †Laevigatosporites medius
 * †Laevigatosporites ovalis
 * †Laevigatosporites striatus
 * †Laevigatosporites vulgaris
 * †Lamellosathyris
 * †Lamellosathyris lamellosa
 * †Lampterocrinus
 * †Lampterocrinus fatigatus
 * †Lasanocrinus
 * †Lasanocrinus daileyi
 * †Lasanocrinus minutus – type locality for species
 * †Lasanocrinus multinodulus – type locality for species
 * †Lasanocrinus nodatus – type locality for species
 * †Lasanocrinus nodus – type locality for species
 * †Lasanocrinus strigosus
 * †Latosporites
 * †Latosporites minutus
 * †Leangella
 * †Leangella dissiticostella
 * †Lecanocrinus
 * †Lecanocrinus erectus
 * †Lecythiocrinus
 * †Lecythiocrinus asymmetricus – type locality for species
 * †Leioclema
 * †Leioclema dozierense
 * †Leioclema pushmatahensis – type locality for species
 * †Leiovalia
 * †Leiovalia scaberula
 * †Leiovalia teretis
 * †Lemmatophora
 * †Lemmatophora typa
 * LeonaspisDeflexa-NaturalHistoryMuseum-August23-08.jpg †[[Leonaspis]]
 * †Leonaspis williamsi
 * †Lepadocystites
 * †Lepadocystites moorei – tentative report
 * †Leperditella
 * †Leperditella aequilatera
 * †Leperditella altiforma
 * †Leperditella deckeri
 * †Leperditella incisa
 * †Leperditella jonesinoides
 * †Leperditella minima
 * †Leperditella porosa
 * †Leperditella rex
 * †Leperditella tumida
 * †Leperditia
 * †Lepidocoelus
 * †Lepidocyclus
 * †Lepidocyclus cooperi
 * †Lepidocyclus manniensis – tentative report
 * †Lepidocyclus oblongus
 * †Lepidocyclus perlamellosus
 * Lepidodendron.png †[[Lepidodendron]]
 * †Lepidodendron hickii
 * †Lepidophloios
 * †Lepidophloios hallii/johnsonii
 * †Leptaena
 * †Leptaena acuticuspidata – type locality for species
 * †Leptaena oklahomensis – type locality for species
 * †Leptaenisca
 * †Leptaenisca concava
 * †Leptaenisca irregularis
 * †Leptagonia
 * †Leptagonia analoga
 * †Leptochirognathus
 * †Leptochirognathus extensa
 * †Leptodesma
 * †Leptodesma gouldii – type locality for species
 * †Leptodesma matheri – type locality for species
 * †Leptodesma stenzeli – type locality for species
 * †Leptoskelidion – tentative report
 * †Leptoskelidion septulosum
 * †Leptostrophia
 * †Leptostrophia beckii
 * †Levenea
 * †Levenea subcarinata
 * †Ligogramma – type locality for genus
 * †Ligogramma sinuosa – type locality for species
 * †Ligogramma wichita – type locality for species
 * †Limipecten
 * †Limipecten newelli – type locality for species
 * †Lindosroemella
 * †Lindosroemella patula – or unidentified comparable form
 * †Lindostoemella
 * †Lindostoemella patula – or unidentified comparable form
 * †Lindostroemella
 * †Lindostroemella patula – or unidentified comparable form
 * Lingula
 * †Lingula carbonaria – or unidentified comparable form
 * †Lingula eva
 * †Lingula paracletus – or unidentified comparable form
 * †Lingulasma
 * †Lingulasma oklahomense
 * Lingulella caelata 1.png †[[Lingulella]]
 * †Lingulella galba
 * †Lingulella glypta
 * †Linoproductus
 * †Linoproductus delawarii – type locality for species
 * †Linoproductus ovatus
 * †Linoproductus prattenianus
 * †Liomolgocrinus
 * †Liomopterella
 * †Liomopterella pediaecetae – type locality for species
 * †Liomopterum
 * †Liomopterum ornatum
 * †Liospira
 * †Liroceras
 * †Liroceras liratum
 * †Lisca
 * †Lisca minuta
 * †Lissatrypa
 * †Lissatrypa clairensis
 * †Lissatrypa concentrica
 * †Lissatrypa decaturensis
 * †Lissatrypa henryhousensis
 * †Lissatrypa parvula
 * †Lissostrophia
 * †Lissostrophia cooperi
 * †Lissostrophia lindenensis
 * †Lissostrophia lindensis
 * Lithophaga
 * Lituotuba
 * Llistrofus.jpg †[[Llistrofus]] – type locality for genus
 * †Llistrofus pricei – type locality for species
 * †Lonchodomas
 * †Lonchodomas mcgeheei
 * †Lonchodus
 * †Lophamplexus
 * †Lophamplexus brevifolius – type locality for species
 * †Lophamplexus lutarius – type locality for species
 * †Lophamplexus spanius – type locality for species
 * †Lophamplexus vagus – type locality for species
 * †Lophophyllidium
 * †Lophophyllidium asarcum – type locality for species
 * †Lophophyllidium compressum – type locality for species
 * †Lophophyllidium hadrum
 * †Lophophyllidium profundum
 * †Lophophyllidium wewokanum – type locality for species
 * †Lophophyllum
 * †Lophospira
 * †Lophotichium
 * †Lophotichium amoenum
 * †Lophotriletes
 * †Lophotriletes commissuralis
 * †Lophotriletes ibrahimii
 * †Lophotriletes microsaetosus
 * †Lophotriletes pseudaculeatus
 * †Lophotriletes rarispinosus
 * †Lophpophyllum
 * †Lophpophyllum profundum – or unidentified comparable form
 * †Loxoedischia – type locality for genus
 * †Loxoedischia drewi – type locality for species
 * †Lueckisporites
 * †Lueckisporites fimbriatus
 * †Lueckisporites virkkiae
 * †Lunaferamita
 * †Lunaferamita bassleri
 * †Lunaferamita virginiensis
 * †Lundbladispora
 * †Lunulasporites – type locality for genus
 * †Lunulasporites vulgaris – type locality for species
 * †Lutesvillia
 * †Lutesvillia bispinosa
 * †Lycospora
 * †Lycospora granulata
 * †Lycospora micropapillata
 * †Lycospora pellucida
 * †Lycospora pusilla
 * †Lycospora rotuda
 * †Lycospora rotunda
 * †Lyroschizodus
 * †Lyroschizodus oklahomensis – type locality for species
 * Lysorophus.jpg †[[Lysorophus]]
 * †Lysorophus tricarinatus

M

 * †Maclurites
 * Macroleter1DB.jpg †[[Macroleter]]
 * †Macroleter agilis – type locality for species
 * †Macropotamorhynchus
 * †Macropotamorhynchus tuta
 * †Macrostylocrinus
 * †Macrostylocrinus striatus
 * †Mandalocystis – type locality for genus
 * †Mandalocystis dockeryi – type locality for species
 * †Manespira
 * †Manespira costata
 * †Manespira elongata
 * †Manespira magnicostata
 * †Marginatia
 * †Marginatia magna
 * †Marginifera
 * †Marginovatia
 * †Marginovatia manardensis
 * †Marginovatia minor
 * †Marginovatia pumila
 * †Mariopteris
 * †Mariopteris nervosa
 * †Mariopteris occidentalis
 * †Marsupiocrinus
 * †Marsupiocrinus stellatus
 * †Marsupipollenites
 * †Marsupipollenites striatus
 * †Martynovia
 * †Martynovia halli – type locality for species
 * †Martynovia longipennis – type locality for species
 * †Mastigograptus
 * †Matonisporites
 * †Maurotarion
 * †Maurotarion axitiosum
 * †Maximites
 * †Maximites oklahomensis – type locality for species
 * †Mcqueenoceras
 * †Meekella
 * †Meekella striatocostata
 * †Meekopinna
 * †Meekopora
 * †Meekospira
 * †Meekospira choctawensis
 * †Meekospira peracuta
 * †Megactenopetalus
 * †Megactenopetalus kaibabanus
 * †Megaglossoceras
 * †Megakozlowskiella
 * †Megakozlowskiella velata
 * †Megaliocrinus
 * †Megaliocrinus aplatus
 * †Megamyonia
 * †Megamyonia mankini
 * †Meganeuropsis
 * †Meganeuropsis americana – type locality for species
 * †Merista
 * †Merista oklahomensis
 * Meristella two views.png †[[Meristella]]
 * †Meristella atoka
 * †Meristina
 * †Meristina claritensis
 * †Meristina roemeri
 * †Mescalites
 * †Mescalites discoidalis
 * †Mesolobus
 * †Mesotrypa
 * †Mesotrypa angularis
 * †Mesotrypa favosa
 * †Mesotrypa tubulifera
 * †Mesoxylon
 * †Metachorus
 * †Metachorus striolatus – type locality for species
 * Metacoceras discoideum 01.jpg †[[Metacoceras]]
 * †Metacoceras cornutum
 * †Metacoceras sinuosum
 * †Metacoceras vagans – type locality for species
 * †Metaconularia
 * †Metacromyocrinus
 * †Metacromyocrinus fundundus – type locality for species
 * †Metacromyocrinus papulosus
 * †Metutharocrinus
 * †Metutharocrinus cockei
 * †Metutharocrinus spinifer – type locality for species
 * †Metutharocrinus undulatus – type locality for species
 * †Michelinia
 * †Michelinia meekana
 * †Michelinoceras
 * †Michelinoceras directum
 * †Michelinoceras wapanuckense
 * Micraroter.jpg †[[Micraroter]] – type locality for genus
 * †Micraroter erythrogeios – type locality for species
 * †Microcaracrinus
 * †Microcaracrinus delicatus
 * †Microcoelodus
 * †Microcoelodus asymmetricus
 * †Microcoelodus inornatus
 * †Microcoelodus intermedius
 * †Microcoelodus minutidentatus
 * †Microcoelodus typus
 * †Microleter – type locality for genus
 * †Microleter mckinzieorum – type locality for species
 * †Microreticulatisporites
 * †Microreticulatisporites nobilis
 * †Microreticulatisporites sulcatus
 * †Microschmidtella
 * †Microschmidtella berdanae – type locality for species
 * †Microschmidtella hami – type locality for species
 * †Microspermopteris
 * †Microspermopteris aphyllum
 * †Micula – tentative report
 * †Midcopterum – type locality for genus
 * †Midcopterum evidens – type locality for species
 * †Mimella
 * †Mimella extensa
 * †Mimella subquadrata
 * †Misthodotes
 * †Misthodotes edmundsi – type locality for species
 * †Misthodotes ovalis
 * †Mitorthoceras
 * †Mitorthoceras crebriliratum – type locality for species
 * †Mitorthoceras perfilosum
 * †Modiolopsis – tentative report
 * Modiolus
 * †Monoceratella
 * †Monoceratella brevispinata
 * †Monoceratina
 * †Monoceratina ardmorensis
 * †Monoceratina ventralis
 * Spirograptus spiralis cropped.jpg †[[Monograptus]]
 * †Monticuliporella
 * †Monticuliporella croneisi
 * †Monticuliporella peculiaris
 * †Monticuliporella shideleri
 * †Mooreina
 * †Mooreina johnsvalleyensis – type locality for species
 * †Mooreisporites
 * †Mooreisporites inusitatus
 * †Mooreoceras
 * †Moorites
 * †Moravia
 * †Moravia grandis – type locality for species
 * †Moundocrinus
 * †Moundocrinus coalensis – type locality for species
 * †Mucrosaccus
 * †Mucrosaccus alatus – type locality for species
 * †Multicostella
 * †Multicostella convexa
 * †Multicostella sulcata
 * †Multidentodus – type locality for genus
 * †Multidentodus brevis – type locality for species
 * †Multidentodus gracilis – type locality for species
 * †Multidentodus irregularis – type locality for species
 * †Multidentodus johnsvalleyensis – type locality for species
 * †Multidentodus typicus – type locality for species
 * †Multidentodus wapanuckensis – type locality for species
 * †Murinella
 * †Murinella partita
 * †Murospora
 * †Murospora kosankei
 * †Myalina
 * †Myalina lepta
 * Mycterosaurus NT small.jpg †[[Mycterosaurus]] – type locality for genus
 * †Mycterosaurus longiceps – type locality for species
 * †Myeinocystites
 * †Myeinocystites natus
 * †Myelodactylus

N

 * †Nanicrinus
 * †Nanicrinus papillatus
 * †Nannaroter – type locality for genus
 * †Nannaroter mckinziei – type locality for species
 * †Nannospondylus – type locality for genus
 * †Nannospondylus stewarti – type locality for species
 * †Naticonema
 * Neritopsidae - Naticopsis.JPG †[[Naticopsis]]
 * †Naticopsis transversa – type locality for species
 * †Navispira
 * †Navispira saffordi
 * †Neoarchaeocrinus
 * †Neoarchaeocrinus necopinus
 * †Neochonetes
 * †Neochonetes granulifer
 * †Neodimorphoceras
 * †Neodimorphoceras oklahomae
 * †Neoglyphioceras
 * †Neoglyphioceras caneyanum – type locality for species
 * †Neoisorophusella
 * †Neoisorophusella whitesidei – type locality for species
 * †Neokoninckophyllum
 * †Neokoninckophyllum acolumnatum
 * †Neokoninckophyllum tushanense
 * †Neoraistrickia
 * †Neospirifer
 * †Neospirifer dunbari
 * †Neostrophia
 * †Neostrophia gregaria
 * †Neothlipsura
 * †Neothlipsura furca
 * Neuropteris PAMuseum.jpg †[[Neuropteris]]
 * †Neuropteris heterophylla
 * †Neuropteris macrophylla
 * †Neuropteris obliqua
 * †Neuropteris osmundae
 * †Neuropteris rarinervis
 * †Nicholsonella
 * †Nicholsonella acanthobscura
 * †Nicholsonella irregularis
 * †Nicholsonella laminata
 * †Nicholsonella moniliformis
 * †Nobloedischia – type locality for genus
 * †Nobloedischia rasnitsyni – type locality for species
 * †Nodosinella
 * †Nodosinella glennensis – type locality for species
 * †Nucleospira
 * †Nucleospira concentrica
 * †Nucleospira ventricosa
 * Nuculidae - Nucula piacentina.jpg [[Nucula]]
 * Nuculana
 * †Nuculavus
 * †Nuculopsis
 * †Nuculopsis girtyi
 * †Nuculopsis subventricosa
 * †Nuculopsis wewoka
 * †Nuculopsis wewokana
 * †Nudauris
 * †Nudauris reticulata
 * †Nuferella
 * †Nuferella rothi – type locality for species
 * †Nummicrinus
 * †Nummicrinus brevis
 * †Nummicrinus papilloseous
 * †Nummulostegina
 * †Nummulostegina ardmorensis – type locality for species
 * †Nuskoisporites
 * †Nuskoisporites renulatus – type locality for species

O

 * †Obturamentella – type locality for genus
 * †Obturamentella wadei
 * †Octonaria
 * Odontochile sp lateral.jpg †[[Odontochile]]
 * †Odontochile syncrama
 * †Odontochile taffi
 * †Odontopteris
 * †Odontopteris permiensis – or unidentified comparable form
 * †Oepikina
 * †Oepikina expatiata
 * †Oepikina extensa
 * †Oepikina formosa
 * †Oepikina gregaria
 * †Oinochoe
 * †Oinochoe coccymelum – type locality for species
 * †Oistodus
 * †Oistodus abundans
 * †Oistodus inclinatus
 * †Oklahomacrinus
 * †Oklahomacrinus frostae
 * †Oklahomacystis
 * †Oklahomacystis spissus
 * †Oklahomacystis tribrachiatus
 * †Oklahomasporites – type locality for genus
 * †Oklahomasporites majori – type locality for species
 * †Oligophyllum – or unidentified comparable form
 * †Oligotypus
 * †Oligotypus tillyardi
 * † Oliveria
 * †Oltulocrinus
 * †Omphalotrochus
 * †Omphalotrochus wolfcampensis
 * †Onniella – tentative report
 * †Onychoplecia
 * †Onychoplecia tenuis
 * †Onychotreta
 * †Onychotreta multiplicata
 * Ophiacodon mirus cropped.png †[[Ophiacodon]]
 * †Ophiacodon major
 * †Ophiacodon mirus – or unidentified comparable form
 * †Ophiacodon uniformis
 * †Ophiletina
 * †Ophiletina bromidensis – type locality for species
 * †Opisthodontosaurus – type locality for genus
 * †Opisthodontosaurus carrolli – type locality for species
 * †Orbiculoidea
 * †Orbiculoidea eximia
 * †Orbignyella
 * †Orbignyella sublamellosa
 * †Orobias
 * †Orobias ciscoensis
 * †Oromycter – type locality for genus
 * †Oromycter dolesorum – type locality for species
 * †Orovenator – type locality for genus
 * †Orovenator mayorum – type locality for species
 * Orthacanthus BW.jpg †[[Orthacanthus]]
 * †Orthacanthus compressus
 * †Orthoceras
 * †Orthograptus
 * †Orthograptus eucharis
 * †Orthonema
 * †Orthosphaeridium
 * †Orthosphaeridium vibrissiferum
 * †Orthostrophella
 * †Orthostrophella clairensis
 * †Orthostrophia
 * †Orthostrophia brownsportensis – or unidentified comparable form
 * †Orthostrophia strophomenoides
 * †Orthotetes
 * †Orthotetes kaskaskiensis
 * †Orthotetes springerensis – type locality for species
 * †Otarion
 * †Otarion axitosum – type locality for species
 * †Ottonosia
 * †Oulodus
 * †Oulodus siluricus
 * †Ovatia
 * †Ovatia laevicosta
 * †Oxoplecia
 * †Oxoplecia filosa
 * †Oxoplecia gouldi
 * †Oxyprora
 * †Oxyprora oklahomaense
 * †Oxyprora sayrei – type locality for species
 * †Ozarkodina
 * †Ozarkodina bohemica
 * †Ozarkodina confluens
 * †Ozarkodina crassa
 * †Ozarkodina sagitta

P

 * †Pachydictya
 * †Pachydictya bromidensis
 * †Pachydictya sheldonensis
 * †Pachydomella
 * †Pachydomella sohni – type locality for species
 * †Pachyglossella
 * †Pachyglossella biconvexa
 * †Pachylyroceras
 * †Pachylyroceras cloudi
 * [[File:Paciphacops claviger, Early Devonian, Wenban Limestone, Cortez Range, Nevada, USA - Houston Museum of Natural Science - DSC01635.JPG|thumb|upright=0.636|Fossil of the trilobite Paciphacops]] †[[Paciphacops]]
 * †Paciphacops birdsongensis – or unidentified comparable form
 * †Paciphacops campbelli
 * †Paciphacops raymondi
 * †Paladin
 * †Paladin morrowensis
 * †Paladin mucronatus – tentative report
 * Palaeoaplysina – tentative report
 * †Palaeocapulus – tentative report
 * †Palaeocapulus acutirostre – or unidentified comparable form
 * †Palaeocrinus
 * †Palaeocrinus hudsoni
 * †Palaeocystites – tentative report
 * †Palaeolima
 * †Palaeolima inequicostata
 * †Palaeoneilo
 * †Palaeostylus
 * †Palaeotextularia
 * †Palaeozygopleura
 * †Palaeozygopleura parva – tentative report
 * †Palecocrinus – tentative report
 * †Paleochiton
 * †Paleochiton kindbladensis – type locality for species
 * †Paleohyperamum – type locality for genus
 * †Paleohyperamum pottsvillensis – type locality for species
 * †Paleotextularia
 * †Paleuthygramma
 * †Paleuthygramma acuta – type locality for species
 * †Paleyoldia
 * †Paleyoldia glabra
 * †Palliseria
 * †Palliseria robusta
 * †Palmerocrinus
 * †Palmerocrinus profundus – type locality for species
 * †Paltodus
 * †Paltodus compressus
 * †Pandaspinapyga
 * †Pandaspinapyga salsa
 * †Panderodus
 * †Panderodus equicostatus
 * †Panderodus gracilis
 * †Panderodus greenlandensis
 * †Panderodus panderi
 * †Panderodus unicostatus
 * †Parabolbina
 * †Parabolbina scotti
 * †Paraconularia
 * †Paracremacrinus
 * †Paracremacrinus laticardinalis
 * †Paracromyocrinus
 * †Paracromyocrinus oklahomensis
 * †Paracromyocrinus planatus – type locality for species
 * †Paradiabolocrinus
 * †Paraechmina
 * †Paragassizocrinus
 * †Paragassizocrinus tarri
 * †Parahealdia
 * †Parahealdia quaesita
 * †Paralegoceras
 * †Paralegoceras iowense
 * †Paralegoceras textum
 * †Parallelodon
 * †Parallelodon vokesi – type locality for species
 * †Paramelocrinus
 * †Paramelocrinus ubaghsi
 * †Paramphicrinus
 * †Paraparchites
 * †Paraparchites circulantis
 * †Paraparchites elongatus – or unidentified comparable form
 * †Paraparchites wapanuckensis
 * †Parapermopsylla – type locality for genus
 * †Parapermopsylla tricubita – type locality for species
 * †Parapostibulla
 * †Parapostibulla graysoni – type locality for species
 * †Paraprisca
 * †Paraprisca fragilis
 * †Pararchaeocrinus
 * †Pararchaeocrinus decoratus
 * †Parasaccites
 * †Parasaccites korbaenis
 * †Paraschmidtella
 * †Parastrophinella
 * †Parastrophinella lepida
 * †Parazophocrinus
 * †Parazophocrinus callosus
 * †Parelmoa – type locality for genus
 * †Parelmoa obtusa – type locality for species
 * †Parelmoa radialis – type locality for species
 * †Parelmoa revelata – type locality for species
 * †Parulrichia
 * †Parulrichia haragenensis
 * †Pasawioops – type locality for genus
 * †Pasawioops mayi – type locality for species
 * †Passalocrinus
 * †Paucicrura
 * †Paucicrura oklahomensis
 * †Paucicrura rogata – or unidentified comparable form
 * †Paurorthis
 * †Paurorthis macrodeltoidea
 * Pecopteris villosa.jpg †[[Pecopteris]]
 * †Pecopteris cyathea
 * †Pecopteris geinitzi
 * †Pecopteris hemitelioides
 * †Pecopteris miltonii
 * †Pecopteris plumosa-dentata – informal
 * †Pecopteris sarefolia
 * †Pelidocrinus
 * †Pelidocrinus exiguus
 * †Peltabellia
 * †Peltabellia implexa
 * †Peltacrinus
 * †Peltacrinus sculptatus
 * †Penicillicrinus
 * †Penniretepora
 * †Penniretepora ardmorensis – type locality for species
 * †Pennsylvanioxylon
 * †Pentameroides
 * Pentremites Glen Dean Fm KY.jpg †[[Pentremites]]
 * †Periglyptocrinus
 * †Periglyptocrinus priscus
 * †Perimestocrinus
 * †Perimestocrinus teneris
 * †Peripetoceras
 * †Permoberotha
 * †Permoberotha villosa – tentative report
 * †Permoblattina
 * †Permoblattina curta
 * †Permocoleus – type locality for genus
 * †Permocoleus wellingtonensis – type locality for species
 * †Permopanorpa
 * †Permopanorpa inaequalis
 * †Permophorus
 * †Permophorus albequus
 * †Permophorus immaturis
 * †Permophorus mexicanus
 * †Permopsylla
 * †Permopsylla americana – tentative report
 * †Perrinites
 * †Perrinites hilli
 * †Perryella – type locality for genus
 * †Perryella olsoni – type locality for species
 * Petalodus ohioensis fossil.jpg †[[Petalodus]]
 * †Petigurus
 * †Petigurus cullisoni
 * †Petraia – tentative report
 * †Petraster
 * †Petrocrania
 * †Petrocrania inflata
 * †Phacellopegma
 * †Phacellopegma schizoderma
 * †Phacelocrinus
 * †Phacelocrinus brevis – type locality for species
 * †Phacelocrinus rosei
 * †Phanassymetria
 * †Phanassymetria quadrupla
 * †Phanassymetria triserrata
 * †Phanelactis
 * †Phaneroneura – type locality for genus
 * †Phaneroneura martynovae – type locality for species
 * †Phaneroneura reducta – type locality for species
 * †Phanocrinus
 * †Phanocrinus alexanderi – type locality for species
 * †Pharkidonotus
 * †Pharkidonotus percarinatus
 * †Phenopterum
 * †Phenopterum elongatum
 * †Phestia
 * †Phestia inflata
 * †Philhedra
 * †Phillipsia – tentative report
 * †Phimocrinus
 * †Pholidocidaris – tentative report
 * †Pholidocidaris irregularis – or unidentified comparable form
 * †Phragmodus
 * †Phragmodus inflexus
 * †Phragmodus undatus
 * †Phragmolites
 * †Phricodothyris
 * †Phyloblatta
 * †Phyloblatta curvata
 * †Phymatopleura
 * †Phymatopleura heteropleura – type locality for species
 * †Phymatopleura nodosa
 * †Pidelocrinus
 * †Pidelocrinus planus
 * †Pilosisporites
 * †Pilosisporites aculeolatus
 * †Pilosisporites williamsii
 * Pinnularia Teilung.jpg †[[Pinnularia]]
 * †Pirocystella
 * †Pisocrinus
 * †Pisocrinus quinquelobus
 * †Pisocrinus spatulatus
 * †Pisocrinus spatulus
 * †Pisocrinus tennesseensis
 * †Pityosporites
 * †Pityosporites westphalensis
 * †Placotriplesia
 * †Placotriplesia praecipta
 * Plaesiomyiidae - Plesiomys subquadrata.JPG †[[Plaesiomys]]
 * †Plaesiomys bellistriatus
 * †Plaesiomys proavitus
 * †Plaesiomys subquadrata
 * †Plagioglypta
 * †Plagioglypta annulostriatum
 * †Planisporites
 * †Planobola
 * †Planobola macrogota
 * †Platyceras
 * †Platyceras subelegans
 * Platycrinitidae - Platycrinites hemisphaericus cropped.jpg †[[Platycrinites]]
 * †Platycystites
 * †Platycystites bassleri
 * †Platycystites bromidensis
 * †Platycystites faberi
 * †Platycystites fimbriatus
 * †Platycystites infundus
 * †Platycystites levatus
 * †Platyfundocrinus
 * †Platyfundocrinus webbersensis – type locality for species
 * †Platymena – tentative report
 * †Platymena bellatula
 * †Platyrhomboides
 * †Platyrhomboides quadratus
 * †Platysaccus
 * †Platysaccus papilionis
 * †Platysaccus saarensis
 * Platysomus gibbosus.jpg †[[Platysomus]]
 * †Platysomus palmaris – or unidentified comparable form
 * †Platystrophia
 * †Platystrophia prima
 * †Platystrophia sutherlandi
 * †Platystrophia uncinata
 * †Plectambonites
 * †Plectambonites sericeus
 * †Plectodonta
 * †Plectodonta petila
 * †Plectoglossa
 * †Plectoglossa oklahomensis
 * †Plectorthis
 * †Plectorthis punctata
 * †Plectorthis symmetrica
 * †Pleuracanthus
 * †Pleuracanthus gracilis
 * Pleurocystites squamosus.jpg †[[Pleurocystites]]
 * †Pleurocystites watkinsi
 * †Plicochonetes
 * †Pliomerops
 * †Pliomerops canadensis – or unidentified comparable form
 * †Pluchratia
 * †Plummericrinus
 * †Plummericrinus expansus – type locality for species
 * †Poikilofusa
 * †Poikilofusa plethysticha
 * †Polidevcia
 * †Polidevcia bellistriata
 * †Polidevcia vaseyana – or unidentified comparable form
 * †Poloniella
 * †Poloniella chaleurensis – or unidentified comparable form
 * †Polyancistrodorus
 * †Polyancistrodorus columbariferus
 * †Polycaulodus
 * †Polycaulodus bidentatus
 * †Polycaulodus tridentatus
 * †Polycladiopora
 * †Polycladiopora pinnata – or unidentified comparable form
 * †Polydeltoideus
 * †Polydeltoideus enodatus
 * †Polygnathodella – type locality for genus
 * †Polygnathodella ouachitensis – type locality for species
 * †Polygnathoides
 * †Polygnathoides siluricus
 * †Polygnathus
 * †Polygnathus wapanuckensis – type locality for species
 * †Polylophothylax
 * †Polylophothylax crossii
 * †Polyplacognathus
 * †Polyplacognathus sweeti
 * †Polypora
 * †Polypora debilis – type locality for species
 * †Polypora ovicellata – type locality for species
 * †Polytylites
 * †Polytylites coryelli – type locality for species
 * †Polytylites kellettae – type locality for species
 * †Polytylites levinsoni – type locality for species
 * †Porocrinus
 * †Porocrinus bromidensis
 * †Postibulla
 * †Postibulla westergaardi – type locality for species
 * †Poteriocrinus – tentative report
 * †Potonieisporites
 * †Potonieisporites simplex – type locality for species
 * †Praecursoricrinus
 * †Praecursoricrinus sulphurensis
 * †Praepleurocystis
 * †Praepleurocystis watkinsi
 * †Prasopora
 * †Prasopora fritzae
 * †Primitiella
 * †Primitiella varicata
 * †Primitiopsis
 * †Primitiopsis bassleri
 * †Primitiopsis elegans
 * †Primitiopsis excavatus
 * †Primitiopsis minutus
 * †Prioniodus
 * †Prioniodus altodus – type locality for species
 * †Prioniodus gerdae
 * †Prismopora
 * †Proallosocrinus
 * †Proallosocrinus exemptus – type locality for species
 * †Proallosocrinus glenisteri – type locality for species
 * †Probnis
 * †Probnis speciosa
 * †Probolichas
 * †Prodentalium
 * †Productella
 * †Productella recensis – type locality for species
 * †Productus
 * †Productus parvus
 * †Productus stehlii – type locality for species
 * Proetus concinnus reconstruction cropped.png †[[Proetus (trilobite)|Proetus]]
 * †Proetus foculus
 * †Progoneura
 * †Progoneura grimaldii – type locality for species
 * †Progoneura nobilis – type locality for species
 * †Progoneura venula – type locality for species
 * †Prokopicrinus
 * †Prokopicrinus laevis
 * †Prokopicrinus tuberculatus
 * †Promopalaeaster
 * †Proshumardites
 * †Protencrinus
 * †Protencrinus atoka – type locality for species
 * †Protereisma
 * †Protereisma arcuatum – or unidentified comparable form
 * †Protereisma latum
 * †Prothalassoceras
 * †Prothalassoceras inexpectans – type locality for species
 * †Prothyris
 * †Prothyris soleniformis – type locality for species
 * †Protocaptorhinus
 * †Protocaptorhinus pricei
 * †Protohaploxypinus
 * †Protohaploxypinus duivenii
 * †Protohaploxypinus rugosus
 * †Protohaploxypinus samoilovichii
 * †Protohaploxypinus suchonensis – or unidentified comparable form
 * †Protohymen
 * †Protohymen anomalus – type locality for species
 * †Protohymen bifurcatus – type locality for species
 * †Protohymen curvatus – type locality for species
 * †Protohymen largus – type locality for species
 * †Protohymen latus – type locality for species
 * †Protohymen pictus – type locality for species
 * †Protohymen readi
 * †Protohymen shafferi – type locality for species
 * †Protohymen venustus – type locality for species
 * †Protozyga
 * †Protozyga loeblichi
 * †Prouddenites
 * †Prouddenites primus
 * †Pseodorthoceras
 * †Pseudelmoa – type locality for genus
 * †Pseudelmoa ampla – type locality for species
 * †Pseudoconocardium
 * †Pseudocryptophyllum – or unidentified comparable form
 * †Pseudodielasma
 * †Pseudodielasma perplexa
 * †Pseudoiasvia – type locality for genus
 * †Pseudoiasvia sinuosa – type locality for species
 * †Pseudolingula
 * †Pseudolingula elegantula – or unidentified comparable form
 * †Pseudolingula imperfecta
 * †Pseudomera
 * †Pseudomera barrandei
 * †Pseudomonotis – tentative report
 * †Pseudomulceodens
 * †Pseudomulceodens cancellatus – or unidentified related form
 * †Pseudoolenoides
 * †Pseudoolenoides acicaudus
 * †Pseudoolenoides carterensis – type locality for species
 * †Pseudoolenoides derbyi – type locality for species
 * †Pseudooneotodus
 * †Pseudooneotodus bicornis
 * †Pseudooneotodus linguicornis
 * †Pseudoparalegoceras
 * †Pseudoparalegoceras brazoense
 * †Pseudopronorites
 * †Pseudopronorites arkansasense
 * †Pseudopronorites quinni
 * †Pseudorthoceras
 * †Pseudorthoceras knoxense
 * †Pseudosyrinx
 * †Pseudosyrinx missouriensis – or unidentified comparable form
 * †Pseudothoceras
 * †Pseudozygopleura
 * †Pseudozygopleura multicostata – tentative report
 * †Pseudozygopleura peoriense
 * †Pseudozygopleura plebium – tentative report
 * †Pseudozygopleura scitula
 * †Psilokirkbyella
 * †Psilokirkbyella magnopuncata
 * †Psophosphaera
 * †Psophosphaera greeri
 * †Pteroconus – tentative report
 * †Pteroconus abbreviatus
 * †Pteronites
 * †Pteronites angustatus – or unidentified comparable form
 * †Pterotocrinus – tentative report
 * †Pterotocrinus springerensis – type locality for species
 * †Ptychocladia
 * †Ptychocladia bassleri
 * †Ptychopleurella
 * †Ptychopleurella rugiplicata
 * †Pudoproetus
 * †Pudoproetus chappelensis
 * †Pulchratia
 * †Pulchrilamina
 * †Pulchrilamina spinosa
 * †Punctaparchites
 * †Punctaparchites rugosus
 * †Punctatisporites
 * †Punctatisporites flavus
 * †Punctatisporites glaber
 * †Punctatisporites minutus
 * †Punctatosporites
 * †Punctatosporites minutus
 * †Punctospirifer
 * †Punctospirifer kentuckensis
 * †Punctospirifer subtexta
 * †Punctospirifer transversa
 * †Punctothyris
 * †Punctothyris kenwoodensis
 * †Punka
 * †Punka akoura
 * †Punka verecunda
 * †Pustula
 * †Pustula kenwoodensis – type locality for species
 * †Pustula oklahomae – type locality for species
 * †Pycnopora
 * †Pycnopora ovatipora – type locality for species
 * †Pygmaeocrinus
 * †Pyrgocystis

Q

 * †Quadrocystis
 * †Quadrocystis graffhami

R

 * †Raaschia – type locality for genus
 * †Raaschia oklahomensis – type locality for species
 * †Rafinesquina
 * †Raistrickia
 * †Raistrickia abdita
 * †Raistrickia aculeata
 * †Raistrickia aculeolata
 * †Raistrickia breveinens
 * †Raistrickia crinita
 * †Raistrickia crocea
 * †Rakverella – tentative report
 * †Ranapeltis
 * †Ranapeltis rowlandi – type locality for species
 * †Ranasasus
 * †Ranasasus brevicephalus
 * †Ranasasus colossus
 * †Ranasasus conicus
 * †Randaynia
 * †Randaynia leatherburyi
 * †Raphistoma
 * †Rayella
 * †Rayella calvini
 * †Rayella parva
 * †Raymondites
 * †Rayonnoceras
 * †Rayonnoceras vaughanianum – type locality for species
 * †Rectifenestella
 * †Rectifenestella tenax
 * †Redstonia
 * †Redstonia cooperi
 * †Reedops
 * †Reedops deckeri
 * †Regulaecystis
 * †Remopleurides
 * †Renalcis
 * †Renaultia
 * †Rensselaerina
 * †Rensselaerina haraganana
 * Reophax
 * †Reophax oacuhitensis – type locality for species
 * †Resserella
 * †Resserella brownsportensis
 * †Reteocrinus
 * †Reteocrinus depressus – type locality for species
 * †Reticestus – tentative report
 * †Reticestus retiferus
 * †Reticulaiina
 * †Reticulariina
 * †Reticulatisporites
 * †Reticulatisporites reticulatus
 * †Reticulopteris
 * †Reticulopteris muensteri
 * †Retispira
 * †Retispira meekiana
 * †Retispira reticulata – type locality for species
 * †Rhabdomeson
 * †Rhabdomeson foerstei – type locality for species
 * †Rhabdomeson rogersi – type locality for species
 * †Rhabdomeson ulrichi – type locality for species
 * †Rhipidomella
 * †Rhipidomella acutisulcata – type locality for species
 * †Rhipidomella diminutiva
 * †Rhipidomella henryhousensis – type locality for species
 * †Rhipidomella oklahomensis – type locality for species
 * †Rhipidomella subtriangularis – type locality for species
 * †Rhipidomelloides
 * †Rhipidomelloides oblata
 * †Rhiptosocherma
 * †Rhiptosocherma improcera
 * †Rhizomaspora – type locality for genus
 * †Rhizomaspora divaricata – type locality for species
 * †Rhizomaspora lemniscata – type locality for species
 * †Rhizomaspora radiata – type locality for species
 * †Rhizomospora
 * †Rhizophyllum
 * †Rhombocladia
 * †Rhombopora
 * †Rhombopora johnsvalleyensis – type locality for species
 * †Rhombopora nitidula – type locality for species
 * †Rhopalia
 * †Rhopalia catenata
 * Rhynchonkos.jpg †[[Rhynchonkos]]
 * †Rhynchonkos stovalli – type locality for species
 * †Rhynchopora
 * †Rhynchopora kollari – type locality for species
 * †Rhynchopora persinuata
 * †Rhynchospirina
 * †Rhynchospirina maxwelli – type locality for species
 * †Rhynchotrema
 * †Rhynchotrema increbescens – tentative report
 * †Richardsonites
 * †Richardsonites richardsonianus – type locality for species
 * †Rishona
 * Rogerella elliptica Jurassic.JPG [[Rogerella]]
 * †Rollia
 * †Rollia goodwini
 * Rostricellula
 * †Rostricellula cuneata
 * †Rothella
 * †Rothella haraganensis – type locality for species
 * †Rothella obliqua
 * †Rothella recta
 * †Rothianiscus
 * †Rothianiscus robusta – type locality for species
 * †Roundyella
 * †Roundyella bellatula
 * †Rowleyella
 * †Rowleyella fabulites
 * †Rugosochinetes
 * †Rugosochonetes
 * †Rugosochonetes multicostus

S

 * †Saccocrinus
 * †Saccocrinus benedicti
 * †Saffordotaxis
 * †Sagenodus
 * †Sagenodus vinslovi
 * †Sandia
 * †Sanguinolites
 * †Sanguinolites omalianus
 * †Sanguinolites raleighensis
 * †Sanguinolites simulans
 * †Sansabella
 * †Sansabella keslingi – type locality for species
 * †Sansabella truncata – or unidentified comparable form
 * †Sansabelloides
 * †Sargentina
 * †Sargentina allani – or unidentified comparable form
 * †Saucrophyllum
 * †Scaphiocrinus – tentative report
 * †Schellwienella
 * †Schellwienella marcidula
 * †Schistoceras
 * †Schistoceras unicum – type locality for species
 * †Schizambon
 * †Schizambon perspinosum
 * †Schizodus
 * †Schizodus chesterensis
 * †Schizodus ovatus
 * †Schizodus texanus
 * †Schizonema
 * †Schizonema hami
 * †Schizophoria
 * †Schizophoria mayesensis – type locality for species
 * †Schmidtella
 * †Schmidtella affinis
 * †Schmidtella asymmetrica
 * †Schmidtella brevis
 * †Schmidtella crassimarginata
 * †Schmidtella excavata
 * †Schmidtella minuta
 * †Schmidtella ovalis
 * †Schmidtella transversa
 * †Schopfipollenites
 * †Schopfipollenites signatus – type locality for species
 * †Schuchertella
 * †Schuchertella attentuata
 * †Schuchertella haraganensis
 * †Sciadiocrinus
 * †Sciadiocrinus cascus – type locality for species
 * †Sciadiocrinus crassacanthus
 * †Sciadiocrinus planulatus
 * †Scolecia
 * †Scolecia filosa
 * †Scolecopteris
 * †Scolecopteris altissima
 * †Scolecopteris gnoma
 * †scolerodont
 * †Scolopodus
 * †Scolopodus oklahomensis – type locality for species
 * †Scolopodus striatum – type locality for species
 * †Scutepustula
 * †Scutepustula arctifossa
 * †Scyphocrinites
 * Scytalocrinidae - Scytalocrinus.JPG †[[Scytalocrinus]]
 * †Scytalocrinus crassibrachiatus – type locality for species
 * †Scytalocrinus sansabensis
 * †Sedgwickia
 * †Sedgwickia rugosa – type locality for species
 * †Seminolites
 * †Seminolites kosomensis – type locality for species
 * †Seminolites perforatus – type locality for species
 * †Seminolites pushmatahensis – type locality for species
 * †Seminolithes
 * †Seminolithes clarkei – type locality for species
 * †Senftenbergia
 * †Septimyalina
 * †Septimyalina burmai
 * †Septopora
 * Seymouria1.jpg   †[[Seymouria]]
 * †Seymouria baylorensis
 * †Shaleria – tentative report
 * †Shansiella
 * †Shansiella carbonaria – tentative report
 * †Shumardoceras
 * †Sibyrhynchus
 * †Sieberella
 * †Sieberella roemeri
 * †Sievertsia
 * Stanhope Tree - geograph.org.uk - 2531669.jpg †[[Sigillaria]]
 * †Sigmophlebia – type locality for genus
 * †Sigmophlebia engeli – type locality for species
 * †Sillerpeton – type locality for genus
 * †Sillerpeton permianum – type locality for species
 * †Sinclairocystis
 * †Sinclairocystis angulatus
 * †Sinclairocystis praedicta
 * †Sinclairocystis sulphurensis
 * †Sinuitina
 * †Sinuitina cordiformis – type locality for species
 * †Sinuopea
 * †Sinuopea basiplanata
 * †Sinuopea vera
 * †Siphonocrinus
 * †Siphonocrinus dignus
 * †Skenidioides
 * †Skenidioides henryhousensis
 * †Skenidioides oklahomensis
 * †Skenidioides perfectus
 * †Skenidium
 * †Skenidium insigne
 * Bivalvia fossils cropped.jpg [[Solecurtus]]
 * †Solecurtus gardneri – type locality for species
 * Solemya – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Soleniscus
 * †Soleniscus primigenia
 * †Soleniscus regularis
 * †Solenochilus
 * †Solenomorpha – tentative report
 * †Solenomorpha nitida – or unidentified comparable form
 * †Somoholites
 * †Sowerbyella
 * †Sowerbyella indistincta
 * †Sowerbyella plicatifera
 * †Sowerbyella variabilis
 * †Sowerbyella vulgata
 * †Sowerbyites
 * †Sowerbyites hami
 * †Sowerbyites lamellosus
 * †Spaniocrinus
 * †Speyeris
 * †Speyeris hami
 * Cheiruridae - Sphaerexochus mirus cropped.jpg †[[Sphaerexochus]]
 * †Sphaerexochus glaber
 * †Sphaerirhynchia
 * †Sphaerirhynchia glomerosa – type locality for species
 * †Sphaerirhynchia lindenensis
 * †Sphaerocoryphe
 * †Sphaerodoma
 * †Sphaerodoma gracilis
 * †Sphaerolepis
 * †Sphaerolepis arctata
 * Sphenophyllum miravallis cropped.jpg †[[Sphenophyllum]]
 * †Sphenophyllum emarginatum
 * †Sphenophyllum gilmorei
 * †Sphenophyllum latifolium – or unidentified comparable form
 * †Sphenophyllum obovatum
 * †Sphenophyllum stoukenbergi – tentative report
 * †Sphenopteris
 * †Sphenopteris macilenta
 * †Spinobairdia
 * †Spinocarinifera
 * †Spinocarinifera semicostata
 * †Spinosporites
 * †Spinosporites exiguus
 * Spirifer perlamosus pedunculate valve.jpg †[[Spirifer]]
 * †Spirifer casteri – type locality for species
 * †Spirifer grimesi
 * †Spirifer opimus
 * †Spiriferellina
 * †Spirillina
 * †Spirillina bendensis – type locality for species
 * Spirorbis
 * †Spirorbis elegans – type locality for species
 * †Spongophylloides
 * †Squamularia
 * †Stacheia
 * †Stacheia congesta
 * †Staffella
 * †Stegerhynchus
 * †Stegerhynchus carmelensis
 * †Stegerhynchus clairensis
 * †Stegerhynchus concinna
 * †Stegnopsis
 * †Stegnopsis erythragora – type locality for species
 * †Stegnopsis wellingensis – type locality for species
 * †Stegocoelia
 * †Stellarocrinus
 * †Stellarocrinus cuneatus
 * †Stenocladia – tentative report
 * †Stenocladia bassleri
 * †Stenopecrinus
 * †Stenopecrinus ornatus – type locality for species
 * †Stenopora
 * †Stephanozyga
 * †Steptognathodus
 * †Stereobrachicrinus – type locality for genus
 * †Stereobrachicrinus pustullosus – type locality for species
 * †Stereostylus
 * †Stereostylus perversus
 * †Stictopora
 * †Stictopora fenestrata
 * †Strabocystis – type locality for genus
 * †Strabocystis fayi – type locality for species
 * †Straparollus
 * †Straparolous
 * †Straparolous catilloides
 * †Straparolous catiloides
 * †Streblochondria – tentative report
 * †Streblochondria tenuilineata
 * †Strebloplax – type locality for genus
 * †Strebloplax crustacea – type locality for species
 * †Streblotrypa
 * †Streblotrypa nicklesi
 * †Streptognathodus
 * †Streptorhynchus
 * †Striatites
 * †Striatites richteri
 * †Striatopodocarpites
 * †Striatopodocarpites caricicostatus
 * †Striatopodocarpites communis
 * †Striatopodocarpites olsonii
 * †Strigigenalis
 * †Strigigenalis caudata
 * †Strigigenalis crassimarginata
 * †Strigigenalis derbyi
 * †Strigigenalis implexa
 * †Strigigenalis insentis
 * †Strigigenalis knighti – or unidentified comparable form
 * †Strimplecystis – type locality for genus
 * †Strimplecystis oklahomensis – type locality for species
 * †Strixella
 * †Strixella acutisulcata
 * †Strobeus
 * †Strobeus brevis
 * †Strobeus gouldiana – type locality for species
 * †Strobeus intercalaris
 * †Strobeus paludinaeformis
 * †Stroboceras
 * †Stroboceras furnishi – type locality for species
 * †Stromatotrypa
 * †Stromatotrypa frondosa
 * †Strongylocrinus
 * †Strongylocrinus hansoni – type locality for species
 * †Strongylocrinus ornatus – type locality for species
 * †Strophochonetes
 * Strophomena costellata brachial.jpg †[[Strophomena]]
 * †Strophomena clermontensis
 * †Strophomena costellata
 * †Strophomena crinerensis
 * †Strophomena neglecta
 * †Strophomena oklahomensis
 * †Strophomena perconcava – or unidentified comparable form
 * †Strophomena planumbona
 * †Strophomena trentonensis
 * †Strophonella
 * †Strophonella alterniradiata
 * †Strophonella bransoni – type locality for species
 * †Strophonella laxiplicata
 * †Strophonella loeblichi
 * †Strophonella prolongata
 * †Strophostylus
 * †Strotersporites – type locality for genus
 * †Strotersporites communis – type locality for species
 * †Stylocrinus
 * †Sulcatisporites
 * †Sulcatisporites potoniei
 * †Sylvohymen
 * †Sylvohymen ingens – type locality for species
 * †Synchirocrinus
 * †Synchirocrinus divisus
 * †Synchirocrinus quadratus
 * †Synerocrinus
 * †Synerocrinus farishi
 * †Syngastrioceras
 * †Syngastrioceras clinei – type locality for species
 * †Syngastrioceras scotti
 * †Syringaxon

T

 * †Tabulipora
 * †Tabulipora macnairi – type locality for species
 * †Tabulipora simplex – type locality for species
 * †Tabulipora tuberculata – or unidentified comparable form
 * †Taeniaesporites
 * †Taeniaesporites noviaulensis – or unidentified comparable form
 * †Taeniopteris
 * †Taeniopteris abnormis
 * †Taeniopteris multinervis
 * †Tainoceras
 * †Tainoceras murrayi
 * †Tanaocystis
 * †Tanaocystis watkinsi
 * †Tarphyceras
 * †Tarphyceras chadwickense
 * †Teguliferina
 * †Teguliferina parva – type locality for species
 * †Tegulocrea
 * †Tegulocrea incerta
 * †Teiichispira
 * †Teiichispira affinis – or unidentified comparable form
 * †Tellinomorpha
 * †Tellinomorpha schencki – type locality for species
 * Tentaculitid041011.jpg †[[Tentaculites]]
 * †Terpnocrinus
 * †Tersomius
 * †Tersomius dolesensis – type locality for species
 * †Tersomius mosesi – type locality for species
 * †Tersomius texensis – or unidentified comparable form
 * †Tetradellina
 * †Tetradellina henningsmoeni
 * †Tetrataxis
 * †Tetrataxis decurrens – or unidentified comparable form
 * †Tetrataxis lata
 * Textularia.jpg [[Textularia]]
 * †Textularia grahamensis – or unidentified comparable form
 * †Thalamocrinus
 * †Thalamocrinus elongatus
 * †Thalattocanthus
 * †Thalattocanthus consonus
 * †Thaleops
 * †Thaleops jaanussoni
 * †Thallograptus
 * †Thamniscus
 * †Thamniscus erectus – type locality for species
 * †Thigriffides
 * †Thigriffides roundyi
 * †Thlipsura
 * †Thlipsura furca
 * †Thlipsurella
 * †Thlipsurella fossata
 * †Thlipsurella muricurva
 * †Thlipsurella murrayensis – type locality for species
 * †Thlipsurella putea
 * †Thlipsuroides
 * †Thomasatia
 * †Thomasatia auricula
 * †Thomasatina
 * †Thomasatina bromidensis
 * †Thomasatina simplex
 * †Thoracoceras
 * †Thrausmosaurus – type locality for genus
 * †Thrausmosaurus serratidens – type locality for species
 * †Thuroholia
 * †Thuroholia crinerensis
 * †Thuroholia croneisi
 * †Thuroholia overbrookensis
 * †Thymnospora
 * †Thymnospora pseudothiessenii – or unidentified comparable form
 * †Thymospora
 * †Thymospora pseudothiessenii
 * †Tolypammina
 * †Torispora
 * †Torispora securis
 * †Torynifer
 * †Trematospira
 * †Trematospira costata – or unidentified comparable form
 * †Trematospira hippolyte – or unidentified comparable form
 * †Trepospira
 * †Trepospira depressa
 * †Trigonirhynchia
 * †Trigonirhynchia acutirostella
 * Trimerorhachis insignis.JPG   †[[Trimerorhachis]]
 * †Trimerorhachis insignis
 * †Triquitrites
 * †Triquitrites additus
 * †Triquitrites bransonii
 * †Triquitrites exiguus
 * †Triquitrites sculptilis
 * †Triquitrites spinosus
 * †Triquitrites subspinosus
 * †Triquitrites tribullatus
 * †Tririctus – type locality for genus
 * †Tririctus reticulatus – type locality for species
 * †Tritonoceras
 * †Trochonodella
 * †Trochonodella obtusa
 * †Trochosporites – type locality for genus
 * †Trochosporites reniformis – type locality for species
 * †Trucherognathus
 * †Trucherognathus distorta
 * †Trucherognathus irregularis
 * †Tryplasma
 * †Tuberculatosporites
 * †Tuberculatosporites robustus
 * †Tubulibairdia
 * †Tubulibairdia simplex
 * †Tupus
 * †Tupus gracilis – type locality for species
 * †Turgidacystis – type locality for genus
 * †Turgidacystis graffhami – type locality for species
 * †Turrilepas
 * †Turrilepas whithersi – type locality for species

U

 * †Ulocrinus
 * †Ulrichia
 * †Ulrichidiscus
 * †Ulrichidiscus forbesi – type locality for species
 * †Unibothriocidaris
 * Urasterella asperula.jpg †[[Urasterella]]
 * †Utharocrinus
 * †Utharocrinus pentanodus

V

 * †Valcourea
 * †Valcourea transversa
 * Varanodon1DB.jpg †[[Varanodon]] – type locality for genus
 * †Varanodon agilis – type locality for species
 * †Varanops
 * †Varanops brevirostris – or unidentified comparable form
 * †Veliberychia
 * †Vermiporella – tentative report
 * †Verrucosisporites
 * †Verrucosisporites grandiverrucosus
 * †Verrucosisporites microtuberosus
 * †Verrucosisporites verrucosus – or unidentified comparable form
 * †Veryhachium
 * †Veryhachium bromidense
 * †Veryhachium irroratum
 * †Vesicaspora
 * †Vesicaspora schemelii
 * †Vesicaspora wilsonii
 * †Vestispora
 * †Vestispora fenestrata
 * †Vestispora foveata
 * †Vestispora pseudoreticulata
 * †Vestispora wanlessii
 * †Victoriacystis
 * †Victoriacystis holmesorum – or unidentified related form
 * †Villosacapsula
 * †Villosacapsula entriche
 * †Vinella
 * †Vinella bilineata – type locality for species
 * †Virginiata
 * †Virginiata arkansana
 * †Vittatina
 * †Vittatina costabilis – type locality for species
 * †Vittatina lata – type locality for species
 * †Vittatina simplex
 * †Vittatina verrucosa
 * †Vogdesia
 * †Vogdesia bromidensis
 * †Voiseyella
 * †Voiseyella novamexicana

W

 * †Waagenella
 * †Waagenella crassus – or unidentified comparable form
 * Walchia piniformis.jpg †[[Walchia]]
 * †Walchia gracilis – or unidentified comparable form
 * †Walchia imbricata – tentative report
 * †Walliserodus
 * †Watongia – type locality for genus
 * †Watongia meieri – type locality for species
 * †Wedekindellina
 * †Wellerella
 * †Wellergyi
 * †Wellergyi brazerianum
 * †Wellerites
 * †Wellerites mohri
 * †Wewokella
 * †Wewokella solida
 * †Wewokites
 * †Wewokites venatus
 * †Whitspakia
 * †Whitspakia schucherti
 * †Wichitoceras
 * †Wichitoceras crassum
 * †Wichitoceras decipiens
 * †Wiedeyoceras
 * †Wilkingia
 * †Wilkingia rothi
 * †Wilsonites
 * †Wilsonites delicatus
 * †Wilsonites vesicatus
 * †Winchellatina
 * †Winchellatina cornuta
 * †Winchellatina longispina
 * †Worthenia
 * †Worthenia tabulata
 * †Wurmiella
 * †Wurmiella excavata
 * †Wurmiella posthamata

X

 * Xenacanthus NT small cropped.png †[[Xenacanthus]]

Y

 * †Yochelsonospira
 * †Yochelsonospira thomasi – type locality for species
 * Yoldia
 * †Youngiella
 * †Youngiella wapanuckensis – type locality for species

Z

 * †Zaphrentites
 * †Zaphrentites arkansanus
 * Zatrachys1DB.jpg †[[Zatrachys]]
 * †Zatrachys serratus
 * †Zeilleria
 * †Zelophyllum
 * †Zenocrinus
 * †Zenocrinus zeus – type locality for species
 * †Zonalasporites
 * †Zonalasporites punctaticus – type locality for species
 * †Zonalasporites punctatus
 * †Zophocrinus
 * †Zophocrinus angulatus
 * †Zosterosporites
 * †Zosterosporites triangularis
 * †Zygopleura
 * †Zygopteris
 * †Zygopteris illinoiensis