List of the Paleozoic life of Indiana

This list of the Paleozoic life of Indiana contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Indiana and are between 538.8 and 252.17 million years of age.

A

 * †Abatocrinus
 * †Abatocrinus grandis
 * Cladida - Abrotocrinus.JPG †[[Abrotocrinus]]
 * †Abrotocrinus coreyi
 * †Abrotocrinus nodosus
 * †Abrotocrinus unicus
 * †Acacocrinus
 * †Acacocrinus americanus
 * †Acanthopecten
 * †Acanthopecten procarboniferous
 * †Achistrum
 * †Achistrum brevis – type locality for species
 * †Achistrum ludwigi
 * †Achistrum nicholsoni
 * †Achistrum triassicum
 * †Achradocrinus
 * †Acidaspis
 * †Acinophyllum
 * †Acinophyllum davisi – type locality for species
 * †Acratia
 * †Acratia similaris
 * †Acrocrinus
 * †Acrocrinus constrictus
 * † Acrophyllum
 * †Acrophyllum ellipticum
 * †Acrophyllum oneidaense
 * †Acrophyllum rugosum
 * Monobathrida - Actinocrinites.JPG †[[Actinocrinites]]
 * †Actinocrinites gibsoni
 * †Actinocrinites grandissimus
 * †Actinocrinites lobatus – tentative report
 * †Actinocrinites lowei
 * †Actinopteria
 * †Actinopteria boydi
 * †Actinostroma
 * †Adinocrinus
 * †Adinocrinus nodosus
 * †Aemuliophyllum
 * †Aemuliophyllum exiguum
 * †Aganaster
 * †Aganaster gregarius
 * †Agaricocrinites
 * †Agaricocrinus
 * Agaricocrinus americanus Carboniferous Indiana.jpg †[[Agaricocrinus americanus]]
 * †Agassizocrinus
 * †Agassizocrinus gibbosus – or unidentified comparable form
 * †Agassizocrinus laevis – or unidentified comparable form
 * †Ageneracrinus
 * †Ageneracrinus basalotumidus
 * †Ahrensisporites
 * †Ahrensisporites guerickei
 * †Aipoceras – tentative report
 * †Alaskadiscus
 * †Alaskadiscus magnus
 * †Alatisporites
 * †Alatisporites trialatus
 * Alethopteris PAMuseum.jpg †[[Alethopteris]]
 * †Alethopteris davreuxi
 * †Alethopteris decurrens
 * †Alethopteris grandini
 * †Alethopteris lonchitica
 * †Alethopteris owenii
 * †Alethopteris serlii
 * †Alisocrinus
 * †Alisocrinus aureatus
 * †Alisocrinus caleyi
 * †Alisocrinus laevis
 * †Allocrinus
 * †Allocrinus benedicti
 * †Allocystites
 * †Allocystites hammeli
 * †Alloprosallocrinus
 * †Alloprosallocrinus conicus
 * †Allorhynchus
 * †Allorhynchus curriei
 * †Alveolites
 * †Alveolites asperus
 * †Alveolites constans
 * †Alveolites dispansus
 * †Alveolites expatiatus
 * †Alveolites goldfussi
 * †Alveolites minimus
 * †Alveolites mordax
 * †Alveolites squamosus
 * †Alveolites winchellana
 * †Amaurotoma
 * †Amaurotoma leavenworthana – type locality for species
 * †Amaurotoma subangulatum – type locality for species
 * †Ambocoelia
 * †Ambonychia
 * †Ambonychia obesa
 * †Ambonychia robusta
 * †Ambonychia suberecta
 * Ammobaculites
 * †Ammobaculites leptos
 * †Ammobaculites pyriformis
 * Ammodiscus
 * †Ammodiscus longexsertus
 * †Ammonellipsites
 * †Ammovertella
 * †Ammovertella inclusa
 * †Ampheristocystis
 * †Ampheristocystis concentricus
 * †Amphipora
 * †Amphipsalidocrinus – type locality for genus
 * †Amphipsalidocrinus inconsuetus
 * †Amphipsalidocrinus scissurus – type locality for species
 * †Amphissites
 * †Amphissites similaris
 * †Amphistrophia
 * †Amphoracrinus
 * †Amplexiphyllum
 * †Amplexiphyllum cruciforme
 * †Amplexiphyllum simplex – tentative report
 * †Amplexiphyllum tenue
 * †Amplexizaphrentis
 * †Amplexizaphrentis spinulosus
 * Amplexopora Trypanites section.jpg †[[Amplexopora]]
 * †Amplexopora discoidea – or unidentified comparable form
 * †Amplexus
 * †Anachoropteris
 * †Anachoropteris involuta
 * †Anapiculatisporites
 * †Anapiculatisporites baccatus
 * †Anapiculatisporites spinosus
 * †Anartiocystis
 * †Anastrophia
 * †Anastrophia internascens
 * †Anchiopsis
 * †Ancyrocrinus
 * †Ancyrocrinus bulbosus
 * †Anematina
 * †Anematina proutana – type locality for species
 * †Angustidontus
 * †Angustidontus seriatus
 * †Angyomphalus
 * †Angyomphalus northviewensis – or unidentified related form
 * †Anisocrinus
 * †Anisocrinus laurelensis
 * †Anisotrypa
 * †Anisotrypa solida
 * †Ankyropteris
 * †Ankyropteris brongnartii
 * Calamitaceae - Annularia stellata.JPG †[[Annularia]]
 * †Annularia mucronata
 * †Annularia radiata
 * †Annularia sphenophylloides
 * †Annularia stellata
 * †Anomalodonta
 * †Anomalodonta gigantea
 * †Anopliopsis
 * †Anopliopsis subcarinata
 * †Anthracospirifer
 * †Anthracospirifer leidyi
 * †Antirhynchonella
 * †Aphelakardia
 * †Aphelakardia indianense
 * †Aphelecrinus
 * †Aphelecrinus oweni
 * †Aphelecrinus randolphensis
 * †Aphelotoxon
 * †Aphlebia
 * †Aphlebia crispa
 * †Apiculatasporites
 * †Apiculatasporites latigranifer
 * †Apiculatisporites
 * †Apiculatisporites abditus
 * †Apiculatisporites lappites
 * †Apiculatisporites setulosus
 * †Arabellites
 * †Arabellites comis
 * †Arabellites conspicuous – or unidentified comparable form
 * †Arabellites cultriformis – or unidentified comparable form
 * †Arabellites hamiltonesis
 * †Arachnophyllum
 * †Arachnophyllum striatum – or unidentified comparable form
 * †Archaeopitys
 * †Archaeopitys eastmanii
 * Fenestellidae - Archimedes species.JPG]] †Archimedes''
 * †Archimedes communis
 * †Archimedes compactus
 * †Archimedes distans
 * †Archimedes intermedius
 * †Archimedes invaginatus
 * †Archimedes lativolvis
 * †Archimedes macfarlani
 * †Archimedes meekanoides
 * †Archimedes meekanus
 * †Archimedes negligens – or unidentified comparable form
 * †Archimedes proutanus
 * †Archimedes swallovanus
 * †Archimedes swallowvanus
 * †Archimedes symmetricus
 * †Archimedes terebriformis
 * †Archinacella
 * †Archinacella indianensis – type locality for species
 * Arctinurus boltoni.jpg †[[Arctinurus]]
 * †Arctinurus boltoni
 * †Arjamannia
 * †Arjamannia aulangonensis
 * †Armenoceras
 * †Armenoceras madisonense
 * †Arnoldella
 * †Arnoldella minuta
 * †Arthroacantha
 * †Arthroacantha carpenteri
 * †Arthropitys
 * †Arthropitys communis
 * †Artisia
 * †Asaphocrinus
 * †Asaphocrinus minor
 * †Ascoceras
 * †Ascoceras newberryi
 * †Ascoceras wabashense
 * †Ascodictyon
 * †Ascopora
 * †Aspidiaria
 * †Asterophyllites
 * †Asterophyllites equisetiformis
 * †Asterophyllites grandis
 * †Asterotheca
 * †Asterotheca crenulata
 * †Asterotheca cyathea
 * †Asterotheca hemitelliodes
 * †Asterotheca miltoni
 * †Asterotheca oreopteridia
 * Asteroxylon.jpg †[[Asteroxylon]]
 * †Asteroxylon setchelli
 * †Astraeospongium
 * †Astylospongia
 * †Astylospongia praemorsa
 * †Atactoporella
 * †Atelodictyon
 * †Athyris
 * †Athyris fultonensis
 * †Athyris lamellosa
 * †Athyris parvirostra
 * †Athyris spiriferoides
 * †Atrypa
 * †Atrypa newsomensis
 * †Atrypa parva – or unidentified comparable form
 * †Atrypa reticularis
 * †Atrypa reticularus
 * †Atrypina
 * †Atrypina disparilis
 * †Aulacophyllum
 * †Aulacophyllum mutabile
 * †Aulacophyllum parvum
 * †Aulacophyllum perlamellosum
 * †Aulacophyllum pinnatum
 * †Aulacophyllum sulcatum
 * †Aulacotheca
 * †Aulocystis
 * †Aulocystis auloporidea
 * †Aulocystis incrustans – tentative report
 * †Aulocystis jacksoni
 * †Aulocystis lucasensis
 * †Aulocystis nobilis
 * †Aulocystis procumbens – tentative report
 * †Aulocystis transitorius – type locality for species
 * AuloporaDevonianSilicaShale.jpg †[[Aulopora]]
 * †Aulopora edithana
 * †Aulopora microbuccinata
 * †Aulopora tubiporoides
 * †Auloporella
 * †Aviculopecten
 * †Aviculopecten colletti
 * †Aviculopecten invalidus
 * †Aviculopecten spinuliferus
 * †Aviculopecten terminalis
 * † Avonia – tentative report
 * † Avonia

B

 * Bairdia
 * †Bairdia compacta
 * †Bairdia egorovi – or unidentified related form
 * †Bairdia kinderhookensis – or unidentified related form
 * †Barroisella
 * †Barroisella campbelli
 * †Barycrinus
 * †Barycrinus asperrimus
 * †Barycrinus asteriscus
 * †Barycrinus cornutus
 * †Barycrinus hoveyi
 * †Barycrinus stenobrachium
 * †Baryschyr
 * †Baryschyr anosus
 * †Batocrinus
 * †Batocrinus grandis
 * †Batocrinus isodactylus
 * †Batostoma
 * †Batostoma prosseri
 * †Batostoma varians
 * †Batostomella
 * †Beatricea
 * †Beatricea undulata
 * †Beecheria
 * †Beecheria illinoisense
 * †Beecheria shumardanum – tentative report
 * †Beecheria sinuata
 * †Belemnospongia
 * †Belemnospongia fascicularis
 * †Belemnospongia parmula
 * Bellerophon umbilicalis.jpg †[[Bellerophon (genus)|Bellerophon]]
 * †Bellerophon gibsoni – type locality for species
 * †Bellerophon jeffersonensis
 * †Bellerophon spergensis – type locality for species
 * †Belodella
 * †Belodella resima – or unidentified comparable form
 * †Beloitoceras
 * †Beloitoceras amoenum – type locality for species
 * †Beloitoceras bucheri
 * †Beloitoceras chapparsi
 * †Beloitoceras cumingsi
 * †Beloitoceras ohioense
 * †Beloitoceras transiens
 * †Bembexia
 * †Bembexia minima
 * Berenicea
 * †Bethacanthus – type locality for genus
 * †Bethacanthus insolitus – type locality for species
 * †Bethanyphyllum
 * †Bethanyphyllum arctifossa
 * †Bethanyphyllum depresstum
 * †Bethanyphyllum pocillum
 * †Bethanyphyllum robustum
 * †Bethanyphyllum validum
 * †Bethanyphyllum vesiculatum
 * †Beyrichoceras
 * †Bigalea
 * †Bigalea ohioensis – type locality for species
 * †Billingsastrea
 * †Billingsastrea yandelli
 * †Blothrophyllum
 * †Blothrophyllum bellicinctum
 * †Blothrophyllum corium
 * †Blothrophyllum greeni – tentative report
 * †Blothrophyllum romingeri – type locality for species
 * †Blothrophyllum sinuosum
 * †Blothrophyllum tripinnatum
 * †Blothrophyllum trisulcatum
 * †Blothrophyllum zaphrentiforme
 * †Blountia – tentative report
 * †Bordonia
 * †Bordonia knappi
 * †Bothrodendron
 * †Bothrodendron minutifolium
 * †Botryocrinus
 * †Botryocrinus nucleus
 * †Botryocrinus polyxo
 * †Brachythyris
 * †Brachythyris fernglenensis – or unidentified related form
 * †Brachythyris suborbicularis
 * †Brahmacrinus
 * †Brahmacrinus elongatus
 * †Brittsia
 * †Brittsia problematica
 * †Brockocystis
 * †Brockocystis nodosaria
 * †Bucania
 * †Bucania simulatrix – type locality for species
 * †Bucanophyllum
 * †Bucanophyllum ohioense
 * †Bucanopsis
 * †Bulimorpha
 * †Bulimorpha bulimiformis – type locality for species
 * †Bulimorpha elongata – type locality for species
 * †Bullimorpha
 * Bumastus ioxus cropped.jpg †[[Bumastus]]
 * †Bumastus armatus – or unidentified comparable form
 * †Bumastus insignis
 * †Bumastus ioxus
 * †Bumastus niagarense – or unidentified comparable form
 * †Bynumina
 * †Byssonychia
 * †Byssonychia richmondensis
 * †Bythocyproidea
 * †Bythopora
 * †Bythopora delicatula
 * †Bythopora gracilis
 * †Bythopora meeki
 * †Bythopora striata

C

 * Calamites stems.JPG †[[Calamites]]
 * †Calamites cruciatus
 * †Calamites suckowii
 * †Calamodendron
 * †Calamodendron americanum
 * †Calamospora
 * †Calamospora breviradiata
 * †Calamospora flava
 * †Calamospora hartungiana
 * †Calamospora liquida
 * †Calamospora mutabilis
 * †Calamospora straminea
 * †Calamostachys
 * †Calamostachys paniculata – tentative report
 * †Calamostachys superba
 * †Calamostachys tuberculata
 * †Calceocrinus
 * †Calliocrinus
 * †Calliocrinus beachleri
 * †Calliocrinus cornutus
 * †Callipleura
 * †Callipleura nobilis
 * Callipteridium fossil cropped.png †[[Callipteridium]]
 * †Callipteridium sullivanti
 * †Callistophyton
 * †Callistophyton boysettii
 * †Callixylon
 * †Callixylon brownii
 * †Callixylon newberryi
 * †Callocystites
 * †Callocystites brevis
 * †Calocephalites
 * †Calostylis
 * †Calostylis trigemma – tentative report
 * †Calymene
 * †Calymene breviceps
 * †Calymene celebra
 * Calymenidae - Calymene niagarensis.JPG †[[Calymene niagarensis]]
 * †Calyptactis
 * †Calyptactis confragosus
 * †Camarotoechia
 * †Camarotoechia gregaria – tentative report
 * †Camarotoechia horsfordi
 * †Camarotoechia mutata
 * †Camarotoechia neglecta – or unidentified comparable form
 * †Camarotoechia pisa
 * †Camarotoechia tethys
 * †Camptocrinus
 * †Camptocrinus plenicirrus
 * The Eurypterida of New York plate 37.jpg †[[Carcinosoma]]
 * †Carcinosoma newlini
 * †Cardiocarpon
 * †Cardiocarpon annulatum
 * †Cardiocarpon dilatatus
 * †Cardiocarpon ingens – tentative report
 * †Cardiocarpon latealatum
 * †Carneyella
 * †Carpocrinus
 * †Carpocrinus sculptus
 * †Carpomanon
 * †Caryocrinites
 * †Caryocrinites bulbulus
 * †Caryocrinites ellipticus
 * †Caryocrinites indianensis
 * †Caryocrinites laurelensis
 * †Caryocrinites sphaeroidalis
 * †Caryocrinites stellatus
 * Caseodus cropped.png †[[Caseodus]]
 * †Caseodus eatoni – type locality for species
 * †Catazyga
 * †Catazyga headi
 * †Catillocrinus
 * †Catillocrinus turbinatus
 * †Catillocrinus wachsmuthi
 * †Cavellina
 * †Cayrocrinites
 * †Cayugaea
 * †Cayugaea subcylindrica
 * †Cayugea
 * †Centronella
 * †Centronella campbelli
 * †Centronella impressa
 * †Centronella navicella
 * †Ceramopora
 * †Ceramopora imbricata
 * †Ceramopora vesicularis
 * †Ceramoporella
 * †Ceramoporella ohioensis
 * †Ceraurinus
 * †Ceraurinus icarus
 * †Ceraurus
 * †Cervifurca – type locality for genus
 * †Cervifurca nasuta – type locality for species
 * †Chancelloria
 * †Charactoceras
 * †Charactoceras baeri
 * †Charactoceras faberi
 * †Cheilocephalus
 * Trilobite Ordovicien 8127.jpg †[[Cheirurus]]
 * †Cheirurus dilatatus
 * †Chilotrypa
 * †Chilotrypa ostiolata
 * †Chomatodus
 * †Chondrites
 * †Chonetes
 * †Chonetes geniculatus
 * †Chonetes yandellanus
 * †Chonophyllum
 * †Chonophyllum nanum
 * †Chonostegites
 * †Chonostegites clappi
 * †Chonostegites tabulatus
 * †Cincinnaticrinus
 * Cincinnetina meeki (Miller, 1875) slab 3.jpg †[[Cincinnetina]]
 * †Cincinnetina meeki
 * †Cincinnetina multisecta
 * †Cingularia
 * †Cingulizonates
 * †Cingulizonates loricatus
 * †Cirratriradites
 * †Cirratriradites annulatus
 * †Cirratriradites annuliformis
 * †Cladochonus
 * †Cladochonus beecheri
 * †Cladochonus crassus
 * †Cladochonus longi
 * †Cladopora
 * †Cladopora acupicta
 * †Cladopora bifurca
 * †Cladopora gracilis – tentative report
 * †Cladopora gulielmi
 * †Cladopora imbricata – tentative report
 * †Cladopora robusta – tentative report
 * †Cladopora roemeri
 * †Cladoxylon
 * †Clathrodictyon
 * †Clathrospira
 * †Clathrospira subconica
 * †Cleiodictya
 * †Cleiodictya gloriosa
 * Cleiothyridina sublamellosa pedunculate valve.jpg †[[Cleiothyridina]]
 * †Cleiothyridina hirsuta
 * †Cleiothyridina obmaxima
 * †Cleiothyridina parvirostra
 * †Cleiothyridina pravirostra
 * †Cleiothyridina sublamellosa
 * †Cleodictya
 * †Clepsidropsis
 * †Clepsidropsis titan
 * †Clepsydropsis
 * †Clepsydropsis bertrandi
 * †Clepsydropsis chaneyi
 * †Clinopistha
 * †Clinopistha exacutus
 * †Cliotrypa
 * †Clorinda – tentative report
 * †Codonotheca
 * †Codonotheca caduca
 * †Coelocerododontus
 * †Coelocerododontus biconvexus – or unidentified comparable form
 * †Coelochilina
 * †Coelochilina striatomarginata
 * †Coeloclema
 * †Coelospira
 * †Coenites
 * †Coenites brownsportensis
 * †Coenites cryptodens – or unidentified comparable form
 * †Coenites laqueata – or unidentified comparable form
 * †Coenites rectilineatus
 * †Coleophyllum
 * †Coleophyllum romingeri
 * †Columnaria
 * †Columnaria alveolata
 * †Columnaria vacua
 * †Complexisporites
 * †Complexisporites chalonerii
 * Compositafossil.jpg †[[Composita]]
 * †Composita globosa
 * †Composita subquadrata
 * †Composita sulcata
 * †Composita trinuclea
 * †Compressiphyllum
 * †Compressiphyllum davisana
 * †Concavicaris
 * †Conchidium
 * †Conchidium biolularis – or unidentified comparable form
 * †Conchidium exporrecta
 * †Conchidium laqueatum
 * †Conchidium littoni – or unidentified comparable form
 * †Conocardium
 * †Conocardium richmondense – type locality for species
 * Constellaria polystomella Liberty Formation.jpg †[[Constellaria]]
 * †Constellaria limitaris
 * †Constellaria polystomella
 * †Conularia
 * †Conularia formosa
 * †Convolutipora
 * †Convolutipora florida
 * †Convolutispora
 * †Convolutispora fromensis
 * †Coolinia
 * †Coolinia subplana
 * †Cordaianthus
 * †Cordaianthus gemmifer
 * †Cordaicarpon – tentative report
 * †Cordaites
 * †Cordaites borassifolius
 * †Cordaites crassinervis
 * †Cordaites principalis
 * †Cornulitella
 * Cornulites cellulosus.jpg †[[Cornulites]]
 * †Cornulites formosa
 * †Cornulites proprius
 * Cornuspira
 * †Cornuspira semiconstrictus
 * †Coronura
 * †Coronura aspectans
 * †Corynotrypa
 * †Corynotrypa dissimilis
 * †Costalocrinus
 * †Costalocrinus rex
 * †Costatulites
 * †Costatulites richmondensis
 * †Cranaena
 * †Cranaena lincklaeni
 * †Cranaena romingeri
 * †Cranaena subcircularis
 * †Cranaena sulcata
 * †Cranaena sullivanti
 * †Crania
 * †Crania chesterensis
 * †Craniops
 * †Craniops hamiltonae
 * †Craniops hamiltoniae
 * †Crassispora
 * †Crassispora kosankei
 * †Crassispora plicata
 * †Craterophyllum
 * †Craterophyllum latiradium – tentative report
 * †Craterophyllum magnificum
 * †Cribanocrinus
 * †Cribanocrinus coxanus
 * †Cribroconcha – tentative report
 * †Cristatisporites
 * †Cristatisporites alpernii
 * †Crossotheca
 * †Crossotheca sagittata
 * Crinoidea - Crotalocrinites sp. .JPG †[[Crotalocrinites]]
 * †Crotalocrinus
 * †Crotalocrinus cora
 * †Crurithyris
 * †Crurithyris parva
 * †Cryptonella
 * †Cryptonella lens
 * †Cryptonella ovalis
 * †Crytobairdia
 * †Crytobairdia compacta
 * †Ctenocrinus
 * †Ctenocrinus granulosus
 * †Ctenodonta
 * †Ctenodonta iphegenia
 * †Ctenodonta madisonensis
 * †Cuffeyella
 * †Cuffeyella arachnoidea
 * †Cunctocrinus
 * †Cunctocrinus fortunatus
 * †Cuneamya
 * †Cuneamya miamiensis
 * †Cupularostrum
 * †Cupularostrum exima
 * †Cupulocorona
 * †Cupulocorona gemmiformis
 * †Cupulocorona hammeli
 * †Cupulocorona osgoodensis
 * †Cupulocrinus
 * †Cupulocrinus gemmiformis
 * †Cyathaxonia
 * †Cyathaxonia cyndon
 * †Cyathaxonia tantilla
 * [[File:Cyathocrinites multibrachiatus fossil crinoid (Mississippian; Crawfordsville, Indiana, USA) 2 (17385978065).jpg|thumb|upright=0.3|Fossilized calyx and partial stem of the Silurian-Permian crinoid ("sea lily") Cyathocrinites]] †[[Cyathocrinites]]
 * †Cyathocrinites glenni – or unidentified comparable form
 * †Cyathocrinites multibrachiatus
 * †Cyathocrinites parvibrachiatus
 * †Cyathocrinites pauli
 * †Cyathocrinites sanduskyensis
 * †Cyathocrinites striatissimus
 * †Cyathocrinites wilsoni
 * †Cyathophyllum – tentative report
 * †Cycloconcha
 * †Cycloconcha milleri
 * †Cyclocyclopa
 * †Cyclogranisporites
 * †Cyclogranisporites aureus
 * †Cyclogranisporites breviradiatus
 * †Cyclogranisporites microgranus
 * †Cyclogranisporites minutus
 * †Cyclogranisporites obliquus
 * †Cyclogranisporites orbicularis
 * †Cyclogranisporites staplini
 * †Cycloholcus
 * †Cyclonema
 * †Cyclonema bilix
 * †Cyclonema daytonensis
 * †Cyclonema gyronemoides
 * †Cyclonema type locality for species – informal
 * †Cyclopentagonopa
 * Cyclopteris fossil cropped.png †[[Cyclopteris]]
 * †Cyclopteris orbicularis
 * †Cyclopteris trichomanoides
 * †Cyclospongia
 * †Cyclospongia discus
 * †Cyclotrypa
 * †Cylicocrinus
 * †Cylicocrinus canaliculatus
 * †Cylicocrinus indianensis
 * †Cylicocrinus spinosus
 * †Cylindrophyllum
 * †Cylindrophyllum compactum
 * †Cymatonota
 * †Cymatonota recta
 * †Cymatonota suberecta
 * Cyphaspis fossil cropped.png †[[Cyphaspis]]
 * †Cyphaspis christyi
 * †Cyphocrinus
 * †Cyphocrinus gorbyi
 * †Cyphotrypa
 * †Cyphotrypa osgoodensis
 * †Cypricardinia
 * †Cypricardinia indenta
 * †Cypricardinia scitula
 * †Cyrtia
 * †Cyrtia exporrecta
 * †Cyrtina
 * †Cyrtina burlingtonensis
 * †Cyrtina hamiltonensis
 * †Cyrtocerina
 * †Cyrtocerina carinifera
 * †Cyrtocerina madisonensis
 * †Cyrtocerina modesta
 * †Cyrtocerina patella
 * †Cyrtodontula
 * †Cyrtodontula sterlingensis
 * †Cyrtolites
 * †Cyrtolites hornyi
 * †Cyrtolites ornatus
 * †Cyrtolites sinuosus
 * Cyrtospirifer verneuili duo.jpg †[[Cyrtospirifer]]
 * †Cyrtospirifer latior
 * †Cystelasma
 * †Cystihalysites
 * †Cystihalysites magnituba
 * †Cystiphylloides
 * †Cystiphylloides americanum
 * †Cystiphylloides cicatriciferum
 * †Cystiphylloides hispidum
 * †Cystiphylloides infundibuliformis
 * †Cystiphylloides nanum
 * †Cystiphylloides plicatum
 * †Cystiphylloides pustulatum
 * †Cystiphylloides quadrangulare
 * †Cystiphylloides squamosum
 * †Cystiphylloides tenuiradium
 * †Cystiphyllum
 * †Cystodictya
 * †Cystodictya lineata
 * †Cytocrinus

D

 * †Dalejina
 * †Dalejina euorthis
 * †Dalejina hybrida
 * †Dalejina newsomensis
 * SilurianTrilobite.jpg †[[Dalmanites]]
 * †Dalmanites halli
 * †Dalmanites limulurus
 * †Danaea
 * †Danaea meccaensis
 * †Dawsonoceras
 * †Dawsonoceras americanum
 * †Dawsonoceras annulatum
 * †Decadocrinus
 * †Decadocrinus depressus
 * †Decadocrinus stellatus – type locality for species
 * †Decadorinus
 * †Decaschisma
 * †Decaschisma pulchellum
 * †Decatocrinus
 * †Deceptrix
 * †Deceptrix albertina
 * †Deceptrix decipiens – tentative report
 * †Dechenella
 * †Dechenella boteroi
 * †Dechenella lucasensis
 * †Decoroproetus
 * †Delicaster
 * †Delicaster enigmaticus
 * †Dellea
 * †Delthyris
 * †Delthyris clarksvillensis
 * †Deltoidospora
 * †Deltoidospora grandis
 * †Deltoidospora sphaerotriangula
 * †Dendrina – tentative report
 * †Dendrocrinus
 * †Densosporites
 * †Densosporites annulatus
 * †Densosporites irregularis
 * †Densosporites sphaerotriangularis
 * †Densosporites spinifer
 * †Densosporites triangularis
 * †Desmacriocrinus
 * †Desmacriocrinus moreyi
 * †Desmidocrinus
 * †Desmidocrinus dubius
 * †Desmidocrinus laurelianus
 * †Devonochonetes
 * †Devonochonetes coronatus
 * †Devonochonetes fragilis
 * †Devonochonetes fragilus
 * †Devonochonetes scitulus
 * †Diabolirhynchia
 * †Diabolirhynchia acinus
 * †Diabolorhynchia
 * †Diabolorhynchia acinus
 * †Diaphorodendron
 * †Diaphragmus
 * †Diaphragmus fasciculatus
 * †Dichocrinus
 * †Dichocrinus ficus
 * †Dichocrinus simplex
 * †Dichocrinus striatus
 * †Dichocrinus ulrichi
 * †Dichostreblocrinus – type locality for genus
 * †Dichostreblocrinus scrobiculus – type locality for species
 * †Dicksonites – tentative report
 * †Dicksonites pluckeneti
 * †Dicoelosia
 * †Dicoelosia bilobata
 * †Diconularia
 * †Dictyoclostus
 * †Dictyoclostus inflatus
 * †Dictyonema
 * †Dictyospongia – tentative report
 * †Diedrorynchus
 * †Diedrorynchus conalatum
 * †Dielasma
 * †Dielasma arkansana
 * †Dielasma crawfordsvillensis
 * †Dielasma crowfordsvillensis
 * †Dielasma illinoisense
 * †Dielasmella
 * †Dielasmella compressa
 * †Diestoceras
 * †Diestoceras cyrtocerinoides
 * †Diestoceras eos
 * †Diestoceras indianense
 * †Diestoceras pupa
 * †Diestoceras reversum – tentative report
 * †Diestoceras shideleri
 * †Diestoceras shiderleri
 * †Diestoceras vasiforme
 * †Diestoceras waynesvillense – type locality for species
 * †Dimegelasma
 * †Dimerocrinites
 * †Dimerocrinites carleyi
 * †Dimerocrinites inornatus
 * †Dimerocrinites occidentalis
 * Dunkleosteus (15677042802).jpg]] †Dinicthys''
 * †Dinobolus
 * †Dinobolus conradi – or unidentified comparable form
 * †Diplochone
 * †Diplochone greenei
 * †Diplothmema
 * †Diplothmema obtusiloba
 * †Diplotrypa
 * †Diplotrypa nummiformis
 * †Disphyllum
 * †Disphyllum cohaerens
 * †Disphyllum synaptophylloides – type locality for species
 * †Ditoecholasma
 * †Ditoecholasma acutiannulatum
 * Batocrinidae - Dizygocrinus.JPG †[[Dizygocrinus]]
 * †Dizygocrinus indianaensis
 * †Dizygocrinus indianensis
 * †Dizygocrinus venustus – or unidentified comparable form
 * †Dizygocrinus whitei – or unidentified comparable form
 * †Dolatocrinus
 * †Dolatocrinus bellarugosus
 * †Dolatocrinus bulbaceus
 * †Dolatocrinus corporosus
 * †Dolatocrinus greeni
 * †Dolerorthis
 * †Dolerorthis flabellites
 * †Dolerorthis interplicata
 * †Dorycrinus
 * †Dorycrinus gouldi
 * †Douvillina
 * †Douvillina inaequistriata
 * †Drabia – tentative report
 * The Eurypterida of New York figure 69.jpg †[[Drepanopterus]]
 * †Drymopora
 * †Drymopora fascicularis
 * †Drymopora frutectosa
 * †Drymopora jacksoni
 * †Drymopora procumbens
 * †Duncanella
 * †Duncanella borealis
 * †Dyscritella
 * †Dystactospongia
 * †Dystactospongia madisonensis

E

 * †Ecclimadictyon
 * †Ecclimadictyon fastigiatum – or unidentified comparable form
 * †Echinoconchus
 * †Echinoconchus alternatus
 * †Echinoconchus biseriatus
 * †Edaphophyllum
 * †Edaphophyllum bifurcatum
 * †Edaphophyllum bipartitum
 * Edestus protopirata1DB.jpg †[[Edestus]]
 * †Edestus heinrichi
 * †Edmondia
 * †Edmondia varsoviensis
 * †Elasmonema
 * †Elasmonema bellatula
 * †Elaterites
 * †Elaterites triferens
 * †Eldredgeops
 * †Eldredgeops rana
 * †Elita
 * †Elita fimbriata
 * †Elvinia
 * †Elytron
 * †Elytron elimatus
 * †Emmonsia
 * †Emmonsia amplissima
 * †Emmonsia bacula
 * †Emmonsia convexa
 * †Emmonsia cymosa
 * †Emmonsia emmonsi
 * †Emmonsia epidermata
 * †Emmonsia eximia
 * †Emmonsia radiciformis
 * †Emmonsia ramosa
 * †Emmonsia tuberosa
 * †Emperocrinus
 * †Emperocrinus indianensis
 * Encrinurus egani from Wisconsin.JPG †[[Encrinurus]]
 * †Encrinurus indianaensis
 * †Endosporites
 * †Endosporites globiformis
 * †Endosporites plicatus
 * †Enterolasma
 * †Enterolasma caliculum
 * †Eocaudia
 * Eocaudina
 * †Eocaudina marginata
 * †Eocaudina mccormacki
 * †Eochonetes
 * †Eochonetes clarksvillensis
 * †Eodictyonella (formerly Dictyonella)
 * †Eodictyonella coralifera – or unidentified comparable form
 * †Eodictyonella reticulata
 * †Eohalysiocrinus
 * †Eohalysiocrinus stigmatus
 * †Eoparisocrinus
 * †Eoparisocrinus siluricus
 * †Eoplectodonta
 * †Eoplectodonta prolongatus
 * †Eoplectodonta transversalis
 * †Eoplicanoplia
 * †Eospinatrypa
 * †Eospinatrypa nodostriata
 * †Eospirifer
 * †Eospirifer eudora
 * †Eospirifer foggi
 * †Eospirifer niagarensis
 * †Eospirifer radiatus
 * †Eotomaria
 * †Eotomaria laphami
 * †Eotomaria trochoides – type locality for species
 * †Eotrochus
 * †Eotrochus tenuimarginatus – type locality for species
 * †Eratocrinus
 * †Eratocrinus salemensis
 * Batocrinidae - Eretmocrinus.JPG †[[Eretmocrinus]]
 * †Eretmocrinus cassedayanus – tentative report
 * †Eretmocrinus magnificus
 * †Eridophyllum
 * †Eridophyllum apertum
 * †Eridophyllum archiaci
 * †Eridophyllum coagulatum
 * †Eridophyllum conjunctum
 * †Eridophyllum seriale
 * †Eridopora
 * †Eridopora macrostoma
 * †Eridorthis
 * †Eridorthis nicklesi
 * The Eurypterida of New York plate 20 cropped.jpg †[[Erieopterus]]
 * †Erieopterus limuloides
 * †Eucalyptocrinites
 * †Eucalyptocrinites caelatus
 * †Eucalyptocrinites crassus
 * †Eucalyptocrinites tuberculatus
 * †Eucheirocrinus
 * †Eucheirocrinus indianensis
 * †Euchondria
 * †Euchondria grandis – tentative report
 * †Euconospira
 * †Euconospira conula – type locality for species
 * †Euconospira elegantula – type locality for species
 * †Eugeneodus – type locality for genus
 * †Eugeneodus richardsoni – type locality for species
 * †Eumetria
 * †Eumetria costata
 * †Eumetria marcyi
 * †Eumetria vera
 * †Eumetria verneuiliana
 * †Eumetria verneuliana
 * †Eunella
 * †Eunella harmonia
 * †Eunema
 * †Eunema helicteres
 * †Eunicites
 * †Euomphalopterus
 * †Euomphalopterus alatus
 * †Eupachycrinus
 * †Eupachycrinus boydii
 * †Eurychilina
 * †Eurychilina striatomarginata
 * †Eusphenopteris
 * †Euthyrhachis
 * †Euthyrhachis indianense
 * †Eutrophoceras

F

 * †Fabalicypris
 * †Fardenia
 * †Fardenia subplana
 * FavositesOrdovicianIndiana.jpg †[[Favosites]]
 * †Favosites arbor
 * †Favosites baculus
 * †Favosites biloculi
 * †Favosites clelandi
 * †Favosites cristatus
 * †Favosites discoideus
 * †Favosites favosus
 * †Favosites forbesi
 * †Favosites forbsei
 * †Favosites goodwini
 * †Favosites hisingeri
 * †Favosites hispidus – or unidentified comparable form
 * †Favosites impeditus
 * †Favosites mundus
 * †Favosites niagarensis
 * †Favosites occidentalis
 * †Favosites patellatus – type locality for species
 * †Favosites pirum
 * †Favosites placentus
 * †Favosites proximatus
 * †Favosites quercus
 * †Favosites ramulosus
 * †Favosites rotundituba
 * †Favosites spinigerus
 * †Favosites turbinatus
 * †Fayettoceras
 * †Fayettoceras thompsoni
 * Fenestella from Couvin Belgium.jpg †[[Fenestella]]
 * †Fenestella burlingtonensis
 * †Fenestella cestriensis
 * †Fenestella exigua
 * †Fenestella matheri
 * †Fenestralia
 * †Ferganella
 * †Fimbrispirifer
 * †Fimbrispirifer divaricatus
 * †Fimbrispirifer venustus
 * †Finitiporus
 * †Finitiporus boardmani
 * †Fistulipora
 * †Fistulipora compressa
 * †Fistulipora compressus
 * †Fistulipora excellens
 * †Fistulipora incrustans
 * †Fistulipora perdensa
 * †Fistulipora promiscua
 * †Fistulipora spergenensis
 * †Fletcheria
 * †Flexaria
 * †Flexaria annosa – or unidentified related form
 * †Flexaria floydensis
 * Flexicalymene-ouzregui-rolled.jpg †[[Flexicalymene]]
 * †Flexicalymene meeki
 * †Florinites
 * †Florinites antiquus
 * †Florinites millotti
 * †Florinites similis
 * †Florinites visendus
 * †Florinites volans
 * †Floweria
 * †Floweria chemungensis

G

 * †Gattendorfia
 * †Gattendorfia alteri – type locality for species
 * †Gazacrinus
 * †Gazacrinus depressus
 * †Gazacrinus inornatus
 * †Gazacrinus magnus
 * †Gazacrinus ventricosus
 * †Gennaeocrinus
 * †Gennaeocrinus carinatus
 * †Gigantopteris
 * †Gigantopteris dawsoni
 * Rhodocrinidae - Gilbertsocrinus tuberosus.JPG †[[Gilbertsocrinus]]
 * †Gilbertsocrinus tuberosus
 * †Gilliodus
 * †Gilliodus orvillei – type locality for species
 * †Gilliodus peyeri – type locality for species
 * †Girtyella
 * †Girtyella brevilobata
 * †Girtyella indianensis
 * †Girtyspira
 * †Girtyspira canaliculata – type locality for species
 * †Gissocrinus
 * †Glabrocingulum
 * Glikmanius1DB.jpg †[[Glikmanius]]
 * †Glikmanius occidentalis
 * Glomospira
 * †Glomospira articulosa
 * †Glyphodeta
 * †Glyphodeta terebriformis – type locality for species
 * †Glyptambon
 * †Glyptambon verrucosus
 * †Glyptaster
 * †Glyptocrinus
 * †Glyptodesma
 * †Glyptopora
 * †Glyptorthis
 * †Glyptorthis insculpta
 * Gomphoceras characters.PNG †[[Gomphoceras]]
 * †Gomphoceras projectum
 * †Gomphoceras wabashense
 * †Gomphocystites
 * †Gomphocystites indianensis
 * †Gorbyoceras
 * †Gorbyoceras crossi
 * †Gorbyoceras duncanae
 * †Gorbyoceras gorbyi
 * †Gorbyoceras hammelli
 * †Gosseletina
 * †Gosseletina subglobosa – type locality for species
 * †Granasporites
 * †Granasporites medius
 * †Granatocrinus
 * †Granatocrinus granulosus – tentative report
 * †Granulatisporites
 * †Granulatisporites granularis
 * †Granulatisporites minutus
 * †Granulatisporites pallidus
 * †Granulatisporites parvus – or unidentified comparable form
 * †Granulatisporites tuberculatus
 * †Graphiadactyllis
 * †Graphiadactyllis fayettevillensis
 * †Graphiadactyllis fernglenesis
 * †Graphiadactyllis granopunctatus
 * †Graphiadactylloides
 * †Graphiadactylloides imopmemsos
 * †Graphiadactylloides lineatus – or unidentified related form
 * †Graphiadactylloides moridgei
 * †Graphiadactylloides unionensis
 * †Graphiadactylus
 * †Graphosterigma
 * †Graphosterigma grammodes
 * †Graptodictya
 * †Greenops
 * †Greenops chilmanae
 * †Greenops pleione
 * RugosaOrdovician.jpg †[[Grewingkia]]
 * †Grewingkia canadensis
 * †Grewingkia rusticum
 * †Griffithidella
 * †Griffithidella doris
 * †Griffithidella welleri
 * †Gypidula
 * †Gypidula nucleus

H
†Hyolithes
 * †Hadroblastus
 * †Hadrophyllum
 * †Hadrophyllum nettelrothi
 * †Hadrophyllum orbignyi
 * Hallopora multitabulata fossil bryozoan (Ordovician; Frankfort IL.jpg †[[Hallopora]]
 * †Hallopora elegantula
 * †Hallopora subnodosa
 * †Halysiocrinus
 * †Halysiocrinus tunicatus
 * †Halysites
 * †Halysites catenularia
 * †Halysites labyrinthicus
 * †Halysites microporus
 * †Hamburgia
 * †Haplistion
 * †Haplistion armstrongi
 * †Hapsiphyllum
 * †Hapsiphyllum cassedayi
 * †Harpidella
 * †Harpidella christyi
 * †Harpidium – tentative report
 * †Healdia
 * †Hebertella
 * †Hebertella alveata
 * †Hebertella occidentalis
 * †Hebertella sinuata
 * †Hebertella subjugata
 * †Hedeina
 * †Hedeina eudora
 * †Hederella
 * †Hederella alpenensis
 * †Hederella delicatula
 * †Hederella filiformis
 * †Hederella thedfordensis
 * †Helicotoma
 * †Helicotoma marginata
 * †Heliolites
 * †Heliolites megastoma
 * Heliophyllum halli Bethany Center Centerfield 2.jpg †[[Heliophyllum]]
 * †Heliophyllum agassizi
 * †Heliophyllum denticulatum
 * †Heliophyllum halli
 * †Heliophyllum incrassatum
 * †Heliophyllum latericrescens
 * †Heliophyllum venatum
 * †Heliophyllum verticale
 * †Helodus
 * †Helodus incisus
 * †Helopora
 * †Helopora inexpectata
 * †Hemitrypa
 * †Hennigopora
 * †Hennigopora apta
 * †Heslerodus
 * †Heslerodus divergens
 * †Hesperorthis
 * †Heteralosia
 * †Heteralosia keokuk
 * †Heterangium
 * †Heterophrentis
 * †Heterophrentis annulata
 * †Heterophrentis cyathiformis
 * †Heterophrentis duplicata
 * †Heterophrentis inflata
 * †Heterophrentis irregularis
 * †Heterophrentis nitida – tentative report
 * †Heterophrentis ovalis
 * †Heterophrentis prolifica
 * †Heterophrentis rafinesqui
 * †Heterophrentis simplex
 * †Heterophrentis trisutura
 * †Heterotrypa
 * †Heterotrypa microstigma
 * †Heterotrypa perplexa
 * †Heterotrypa prolifica
 * †Heterotrypa singularis
 * †Heterotrypa subramosa
 * Hexagonaria percarinata close view.JPG †[[Hexagonaria]]
 * †Hexagonaria bella
 * †Hexagonaria cincta
 * †Hexagonaria curta
 * †Hexagonaria ovoidea
 * †Hexagonaria partita
 * †Hexagonaria ponderosa
 * †Hexagonaria prisma
 * †Hexameroceras
 * †Hexameroceras cacabiforme
 * †Hexameroceras delphicolum
 * †Hindella – tentative report
 * †Hindia
 * †Hippocardia
 * †Hippocardia ohioense
 * †Hirneacrinus
 * †Hirneacrinus cupellaeformis – type locality for species
 * †Hirneacrinus perplanus – type locality for species
 * †Hiscobeccus
 * †Hiscobeccus capax
 * †Histocrinus
 * †Histocrinus coreyi
 * †Histocrinus grandis
 * †Histocrinus graphicus
 * †Hizemodendron
 * †Hizemodendron serratum
 * †Hoareicardia
 * †Hoareicardia cunea
 * †Holcocrinus
 * †Holcocrinus nodobrachiatus
 * †Holcospermum
 * †Holocystites
 * †Holocystites abnormalis
 * †Holocystites abnormis
 * †Holocystites alternatus
 * †Holocystites clavus
 * †Holocystites faberi – or unidentified comparable form
 * †Holocystites ornatus
 * †Holocystites ovatus
 * †Holocystites parvulus
 * †Holocystites perlongus
 * †Holocystites scutellatus
 * †Holocystites spangleri
 * †Holocystites splendens
 * Holopeidae - Holopea praestans.JPG †[[Holopea]]
 * †Holopea ampla
 * †Holtedahlina
 * †Holtedahlina sulcata
 * †Homalophyllum
 * †Homalophyllum fusiformis
 * †Homalophyllum herzeri
 * †Homalophyllum ungulum
 * †Homocrinus
 * †Homoeospira
 * †Homoeospira evax
 * †Homotrypa
 * †Homotrypa alta – or unidentified related form
 * †Homotrypa austini – or unidentified comparable form
 * †Homotrypa communis
 * †Homotrypa flabellaris
 * †Homotrypa gelasinosa
 * †Homotrypa nodulosa – or unidentified comparable form
 * †Homotrypa richmondensis
 * †Homotrypa wortheni
 * †Homotrypella
 * †Hondichnus
 * †Hondichnus monroensis
 * †Hormotoma
 * †Hormotoma gracilis
 * †Howellella
 * †Howellella crispa
 * †Howellella crispus
 * †Hydnoangulus – type locality for genus
 * †Hydnoangulus quadratus – type locality for species
 * †Hydriodictya – tentative report
 * †Hydriodictya cyclix
 * †Hylodecrinus
 * †Hylodecrinus sculptus
 * †Hyolithes monroensis
 * Hyperammina
 * †Hyperammina bulbosa
 * †Hyperammina casteri
 * †Hyperammina constricta
 * †Hyperammina gracilenta
 * †Hyperammina kentuckyensis
 * †Hyperammina rockfordensis
 * †Hypergonia
 * †Hypergonia attenuata – type locality for species
 * †Hypergonia turritella – type locality for species
 * †Hypergonia vermicula – type locality for species
 * †Hypselocrinus
 * †Hypselocrinus hoveyi
 * †Hypselocrinus indianensis

I

 * †Ichthyorachis
 * †Icriodus
 * †Icriodus latericrescens
 * †Icthyocrinus
 * †Icthyocrinus corbis
 * †Icthyocrinus subangularis
 * †Ildraites
 * †Ildraites howelli
 * †Illaenoides
 * †Illaenus
 * †Imbrexia
 * †Imbrexia forbesi
 * †Imbrexia montgomeryensis
 * †Imbrexia mortonana
 * †Imitoceras
 * †Imitoceras rotatorium
 * †Iniopera – type locality for genus
 * †Iniopera richardsoni – type locality for species
 * Iniopteryxrushlaui.JPG †[[Iniopteryx]]
 * †Iniopteryx rushlaui
 * †Inocaulis
 * †Intrapora
 * †Intrapora irregularis
 * †Iocrinus
 * †Ischadites
 * †Ischadites subturbinatus
 * †Ischadites tenuis
 * †Ischyrodonta
 * †Ischyrodonta decipiens
 * †Ischyrodonta ovalis
 * †Ischyrodonta truncata
 * †Isobuthus
 * †Isobuthus pottsvillensis – type locality for species
 * †Isochilina
 * †Isochilina subnodosa
 * †Isorthis
 * †Isorthis arcuaria – or unidentified related form
 * Isotelus brachycephalus.JPG †[[Isotelus]]
 * †Isotelus gigas
 * †Isotelus maximus

K

 * †Kallimorphocrinus – type locality for genus
 * †Kallimorphocrinus astrus – type locality for species
 * †Kalymma
 * †Kalymma lirata
 * †Karinopteris
 * †Kaskia
 * †Kaskia chesterensis
 * †Kindbladia
 * †Kindleoceras
 * †Kindleoceras cumingsi
 * †Kindleoceras equilaterale
 * †Kindleoceras rotundum
 * †Kingstonia
 * †Kionelasma
 * †Kionelasma coarticum
 * †Kionelasma conspicuum
 * †Kionelasma mammiferum
 * Kionoceras doricum.JPG †[[Kionoceras]]
 * †Kionoceras bellense – or unidentified comparable form
 * †Kionoceras cancellatum
 * †Kionoceras delphiense
 * †Kirkbya
 * †Kirkbya fernglenensis
 * †Kirkbya keiferi
 * †Kirkbyella
 * †Kirkbyella annensis
 * †Kirkidium
 * †Kirkidium knighti – or unidentified comparable form
 * †Kirkidium laqueatum
 * †Knightites
 * †Knoxina
 * †Knoxisporites
 * †Knoxisporites rotatus
 * †Knoxisporites triradiatus
 * †Kodonophyllum
 * †Kodonophyllum mulleri – or unidentified comparable form
 * The Eurypterida of New York plate 54.jpg †[[Kokomopterus]]
 * †Kokomopterus longicaudatus
 * †Kosovopeltis

L

 * †Labechia
 * †Laevigatosporites
 * †Laevigatosporites desmoinensis
 * †Laevigatosporites desmoinesensis
 * †Laevigatosporites globosus
 * †Laevigatosporites medius
 * †Laevigatosporites minutus
 * †Laevigatosporites ovalis
 * †Laevigatosporites punctatus
 * †Laevigatosporites vulgaris
 * †Lambeoceras
 * †Lambeoceras richmondense
 * †Lampadosocrinus
 * †Lampadosocrinus minutus
 * †Langepis
 * †Langepis campbelli – type locality for species
 * †Laurelocrinus
 * †Laurelocrinus gibbosus
 * †Laurelocrinus paulensis
 * †Laurelocrinus spinoradialis
 * †Laurelocrinus wilsoni
 * †Leangella
 * †Lebedictya
 * †Lebedictya crinita
 * †Lebetocrinus
 * †Lebetocrinus grandis
 * †Lecanocrinus
 * †Lecanocrinus elongatus
 * †Lecanocrinus pusillus
 * †Lechritochoceras
 * †Lechritochoceras desplainense
 * †Lecythiocrinus – tentative report
 * †Leiorhynchus
 * †Leiorhynchus limitare
 * †Leiorhynchus quadricostatum
 * †Leiotriletes
 * †Leiotriletes adnatoides
 * †Leiotriletes levis
 * †Leiotriletes notatus
 * †Leodicites
 * †Leodicites imparilis – or unidentified related form
 * †Leodicites variedentatus
 * †Lepadocystis
 * †Leperditia
 * †Leperditia caecigena
 * †Leperditia caecigenia
 * †Lepetopsis
 * †Lepetopsis levettei – type locality for species
 * †Lepidocarpon
 * †Lepidocyclus
 * †Lepidocyclus perlamellosum
 * Stigmaria Heimans.jpg †[[Lepidodendron]]
 * †Lepidodendron aculeatum
 * †Lepidodendron baylense
 * †Lepidodendron dichotomum
 * †Lepidodendron hickii
 * †Lepidodendron lanceolatum – tentative report
 * †Lepidodendron latifolium
 * †Lepidodendron modulatum
 * †Lepidodendron obovatum
 * †Lepidodendron ophiurus
 * †Lepidodendron vestitum
 * †Lepidodendron wortheni
 * †Lepidophloios
 * †Lepidophloios hallii
 * †Lepidophloios laricinus – or unidentified comparable form
 * †Lepidophyllum
 * †Lepidophyllum longifolium
 * †Lepidostrobophyllum
 * †Lepidostrobophyllum affine
 * †Lepidostrobophyllum ovatifolius
 * †Lepidostrobophyllum princeps – or unidentified comparable form
 * †Lepidostrobus
 * †Lepidostrobus incertus – or unidentified comparable form
 * †Lepidostrobus variabilis
 * †Leptaena
 * †Leptaena convexa
 * †Leptaena gibbosa
 * †Leptaena rhomboidalis
 * †Leptaena richmondensis
 * †Leptoconocardium
 * †Leptoconocardium catastomum – type locality for species
 * †Leptodesma
 * †Leptodesma rogersi
 * †Leptotrypella
 * †Leptotrypella ohioensis
 * †Lesueurilla
 * †Lesueurilla beloitensis
 * †Lichas
 * †Lichas breviceps
 * †Lichenalia
 * †Liljevallospira
 * †Limoptera
 * Lingula anatina 7 .JPG †[[Lingula (genus)|Lingula]]
 * †Lingula otheri
 * †Lingula spatulata
 * †Lingulops
 * †Linoproductus
 * †Linoproductus altonensis
 * †Linoproductus pileiformis
 * †Linopteris
 * †Liospira
 * †Liospira micula
 * †Liospira obtusa
 * †Liospira vitruvia
 * †Lissatrypa
 * †Litocrinus
 * †Llanoaspis – tentative report
 * †Lobatopteris
 * †Lobatopteris vestita – or unidentified comparable form
 * †Lobomelocrinus
 * †Lobomelocrinus obconicus
 * †Lophoblastus
 * †Lophoblastus inopinatus – or unidentified comparable form
 * †Lophospira
 * †Lophospira milleri
 * †Lophospira perangulata
 * †Lophospira serrulata
 * †Lophospira ventricosa
 * †Lophotriletes
 * †Lophotriletes commissuralis
 * †Lophotriletes pseudaculeatus
 * †Lophotriletes rarispinosus
 * †Loxonema
 * †Lumbriconerites
 * †Lumectaster
 * †Lumectaster howelli
 * †Lunulazona – tentative report
 * †Lunulazona springeri
 * †Lycospora
 * †Lycospora granulata
 * †Lycospora micropapillata
 * †Lycospora noctuina
 * †Lycospora orbicula
 * †Lycospora paulula
 * †Lycospora pellucida
 * †Lycospora punctata
 * †Lycospora pusilla
 * †Lycospora rotunda
 * †Lycospora subjuga
 * †Lyginorachis
 * †Lyginorachis dineuroides
 * †Lyriocrinus
 * †Lyriocrinus melissa
 * †Lyrodesma
 * †Lyrodesma major
 * †Lyropora
 * †Lyropora devonica
 * †Lyroporella
 * †Lyroporella divergens
 * †Lysocystites
 * †Lysocystites sculptus
 * †Lytospira
 * †Lytospira undulatus

M

 * †Macrocrinus
 * †Macrocrinus mundulus – tentative report
 * †Macrocrinus strotobasilaris
 * †Macrocrinus strotobasilarsis
 * Macrocypris – tentative report
 * †Macrostachya
 * †Macrostachya infundibuliformis
 * †Macrostylocrinus
 * †Macrostylocrinus fasciatus
 * †Macrostylocrinus striatus
 * †Manicrinus
 * †Manicrinus erectus
 * †Manicrinus hybocriniformis
 * †Manitoulinoceras
 * †Manitoulinoceras erraticum
 * †Manitoulinoceras gyroforme
 * †Manitoulinoceras moderatum
 * †Marginatia
 * †Marginatia burlingtonensis
 * †Marginatia crawfordsvillensis
 * †Marginirugus
 * †Marginirugus magnus
 * †Mariopteris
 * †Mariopteris hymenophylloides – tentative report
 * †Mariopteris mazoniana
 * †Mariopteris muricata
 * †Mariopteris nervosa
 * †Marsupiocrinus
 * †Marsupiocrinus laurelensis
 * †Marsupiocrinus pauciornatus
 * †Marsupiocrinus turbinatus
 * †Martinia
 * †Martinia contracta
 * †Maurotarion
 * †Maurotarion christi
 * †Mediospirifer
 * †Mediospirifer audaculus
 * †Medullosa
 * †Meekopora
 * †Meekopora eximia
 * †Megakozlowskiella
 * †Megakozlowskiella sculptilis
 * †Megalomphala
 * †Megalomphala crassa
 * †Megalomus
 * †Megalomus canadensis
 * †Megastrophia
 * †Megastrophia concava
 * †Megastrophia profunda
 * †Megistocrinus
 * †Megistocrinus expansus
 * †Melocrinites
 * †Melocrinites aequalis
 * †Melocrinites oblongus
 * †Melonechinus
 * †Mendacella
 * †Mendacella circulus
 * †Meniscophyllum
 * †Meniscophyllum minutum
 * †Menoeidina
 * †Merista
 * †Merista nitida
 * Meristella two views.png †[[Meristella]]
 * †Meristella nasuta
 * †Meristina
 * †Meristina maria
 * †Meristina rectirostra
 * †Meristina rectirostris
 * †Merocanites
 * †Mesocyridira
 * †Mesocyridira bifurcata
 * †Mesocyridira flagrocosta
 * †Mesocyridira keokuk
 * †Mesocyridira pallaensis – or unidentified related form
 * †Mesocyridira pellaensis – or unidentified related form
 * †Mesocyridira washingtonensis
 * †Mesoleptostrophia
 * †Mesoneuron
 * †Mesoneuron simplex
 * †Mesotrypa
 * †Metriophyllum
 * †Metriophyllum deminutivum
 * †Miamoceras
 * †Miamoceras shideleri
 * †Michelinia
 * †Michelinia manucus
 * †Microantyx
 * †Microantyx botoni – type locality for species
 * †Microcheilinella
 * †Microcheilinella spinosa
 * †Microplasma
 * †Microreticulatisporites
 * †Microreticulatisporites nobilis
 * †Microreticulatisporites sulcatus
 * †Mirocheilinella
 * †Mixoneura – tentative report
 * †Mixoneura jenneyi
 * †Modiolopsis
 * †Modiolopsis concentrica – tentative report
 * †Modiolopsis modiolaris
 * †Modiolopsis versaillesensis
 * †Modiomorpha
 * †Modiomorpha concentrica
 * †Monodechenella
 * †Monodechenella macrocephala
 * †Monomorella
 * †Monotrypa
 * †Monotrypa benjamini
 * †Monotrypa exserta
 * †Monotrypella
 * †Monotrypella aequalis
 * †Mooreisporites
 * †Mooreisporites inusitatus
 * †Mooreoceras
 * †Mooreoceras chouteauense
 * †Mooreoceras indianense
 * †Mourlonia
 * †Mucophyllum
 * Mucrospirifer mucronatus Silica Shale.JPG  †[[Mucrospirifer]]
 * †Mucrospirifer mucronatus
 * †Mucrospirifer profundus
 * †Mucrospirifer prolificus
 * †Muensteroceras
 * †Muensteroceras oweni
 * †Muensteroceras parallelum
 * †Mulceodens
 * †Mulceodens jaanussoni – or unidentified comparable form
 * †Murchisonia
 * †Murchisonia laphami
 * †Murchisonia subulata
 * †Murchisonia vincta – type locality for species
 * †Murchisonida
 * †Myalina
 * †Myalina keokuk
 * †Myelodactylus
 * †Myelodactylus ammonis
 * †Myelodactylus convolutus
 * †Mysticocrinus

N

 * †Natica
 * †Natica littonana – type locality for species
 * †Naticonema
 * Neritopsidae - Naticopsis.JPG †[[Naticopsis]]
 * †Naticopsis carleyana – type locality for species
 * †Naticopsis plebeia
 * †Navispira
 * †Navispira kennethensis
 * †Neilsonia
 * †Neilsonia insculpta – type locality for species
 * †Nematopora
 * †Neolageniocrinus
 * †Neolageniocrinus cassidus – type locality for species
 * †Neopalaeaster
 * †Neopalaeaster crawfordsvillensis
 * †Neozaphrentis
 * †Nereidavis
 * Neuropteris cropped.jpg †[[Neuropteris]]
 * †Neuropteris fimbriata
 * †Neuropteris flexuosa
 * †Neuropteris heterophylla
 * †Neuropteris macrophylla
 * †Neuropteris obliqua
 * †Neuropteris ovata
 * †Neuropteris rarinervis
 * †Neuropteris scheuchzeri
 * †Neuropteris tenuifolia
 * †Neuropteris violetta
 * †Nicklesopora
 * †Nikiforovella
 * †Nipterocrinus
 * †Nipterocrinus monroensis
 * †Nucleocrinus
 * †Nucleocrinus angularis
 * †Nucleospira
 * †Nucleospira concentrica – or unidentified comparable form
 * †Nucleospira concinna
 * †Nucleospira pisiformis
 * †Nucleospira rowleyi – or unidentified related form
 * †Nucularca
 * †Nucularca cingulata
 * †Nuculites
 * †Nuculopsis
 * †Nuculopsis hians

O

 * †Odontophyllum
 * †Odontophyllum convergens
 * Odontopleura ovata reconstruction.jpg †[[Odontopleura]] – tentative report
 * †Odontopteris
 * †Odontopteris subcuneata
 * †Ohiocrinus
 * †Ohiocrinus brauni
 * †Oligocarpia
 * †Oligocarpia missouriensis
 * †Omospira
 * †Omospira alexandra – or unidentified comparable form
 * †Omphalophloios
 * †Omphalophloios wagneri – type locality for species
 * †Oncoceras
 * †Oncoceras anomalum
 * †Oncoceras duncanae
 * †Oncoceras exile
 * †Oncoceras insuetum
 * †Onniella
 * †Onniella macerata
 * †Onychaster
 * †Onychaster flexilis
 * Synerocrinidae - Onychocrinus.JPG †[[Onychocrinus]]
 * †Onychocrinus exculptus
 * †Onychocrinus exsculptus
 * †Onychocrinus pulaskiensis
 * †Onychocrinus ramulosus
 * †Onychopterella
 * †Onychopterella kokomoensis
 * †Oonoceras
 * †Oonoceras fennemani
 * †Oonoceras rejuvenatum
 * †Oonoceras shideleri
 * †Ophiletina
 * †Ophiletina sublaxa
 * †Opisthoptera
 * †Opisthoptera casei
 * †Orbiculoidea
 * †Orbiculoidea keokuk
 * †Orbiculoidea lodiensis
 * †Oriostoma
 * †Oriostoma globosum – or unidentified comparable form
 * †Oriostoma hoyi
 * †Ornithoprion – type locality for genus
 * †Ornithoprion hertwigi – type locality for species
 * Orodus sp1DB.jpg †[[Orodus]]
 * †Orodus greggi – type locality for species
 * †Orodus micropterygius – type locality for species
 * †Orthis
 * †Orthis biforata
 * †Orthis pyramidalis
 * †Orthodesma
 * †Orthodesma curvatum
 * †Orthonybyoceras
 * †Orthonybyoceras dyeri
 * †Orthonychia
 * †Orthonychia conicum
 * †Orthopleura
 * †Orthostrophia
 * †Orthostrophia fissistriata
 * †Orthotetes
 * †Orthotetes kaskaskiensis
 * †Orthotetes keokuk
 * †Ortonella
 * †Ortonella hainesi
 * †Osgoodicystis
 * †Osgoodicystis biessetti
 * †Osgoodicystis cooperi
 * †Osgoodicystis wykoffi
 * †Otarion
 * †Otarion niagarensis
 * †Ovatia
 * †Ovatia ovata – tentative report
 * †Ovatia ovatus
 * †Oxyprora
 * †Oxyprora carinatum – type locality for species

P

 * †Pachydictya
 * †Pachydictya crassa
 * †Pachylocrinus
 * †Pachylocrinus aequalis
 * †Pachylocrinus briareus
 * †Pachylocrinus gibsoni
 * †Pachytesta
 * †Pachytesta vera – or unidentified comparable form
 * †Palaeacis
 * †Palaeacis enormis
 * †Palaeocapulus
 * †Palaeocapulus acutirostre
 * †Palaeocapulus equilateralis
 * †Palaeoconcha
 * †Palaeoconcha faberi
 * †Palaeoneilo
 * †Palaeoneilo sulcatina
 * †Palaeoneilo truncata
 * †Palaeostachya
 * †Palaeostachya elongata
 * †Paleofavosites – tentative report
 * †Paleofavosites prolificus
 * †Paleospora
 * †Paleospora fragila
 * †Paleostachya
 * †Paliphyllum
 * †Paliphyllum suecicum brassfieldense
 * †Palmatolepis
 * †Palmatolepis linguiformis
 * †Palmatolepis pseudofoliatus
 * †Palmatolepis timorenis
 * †Palmatopteris
 * †Palmatopteris furcata
 * †Paolia – type locality for genus
 * †Paolia vetusta – type locality for species
 * †Paoliola
 * †Paoliola gurleyi – type locality for species
 * †Paracolocrinus
 * †Paracolocrinus paradoxicus
 * †Paraconularia
 * †Paraconularia chesterensis – tentative report
 * †Paraconularia crawfordsvillensis
 * †Paracyclas
 * †Paracyclas occidentalis
 * †Paracyclas proavia
 * †Paradichocrinus
 * †Paradichocrinus planus
 * †Paradichocrinus polydactylus
 * †Paragazacrinus
 * †Paragazacrinus rotundus
 * †Parallelodon
 * †Parallelodon obsoletus – tentative report
 * †Parallelodon tenuistriatus
 * †Paralycopodites
 * †Paralycopodites brevifolius
 * †Paraparchites
 * [[File:Paraspirifer bownockeri, pyritized brachiopods, Middle Devonian, Silica Shale, Lucas County, Ohio, USA - Houston Museum of Natural Science - DSC01732.JPG|thumb|upright=0.745|Assemblage of the Early-Middle Devonian brachiopod Paraspirifer]] †[[Paraspirifer]]
 * †Paraspirifer acuminatus
 * †Parazyga
 * †Parazyga hirsuta
 * †Parichthyocrinus
 * †Parichthyocrinus crawfordsvillensis
 * †Parichthyocrinus meeki
 * †Parisocrinus
 * †Parisocrinus crawfordsvillensis
 * †Parvohallopora
 * †Parvohallopora ramosa
 * †Passalocrinus
 * †Passalocrinus triangularis
 * †Patelliocrinus
 * †Patelliocrinus indianensis
 * †Patelliocrinus laevis
 * †Patelliocrinus ornatus
 * †Patelliocrinus rugosus
 * †Paulicystis
 * †Paulicystis densus
 * †Paulicystis sparsus
 * †Paulocrinus
 * †Paulocrinus biturbinatus
 * †Paupospira
 * †Paupospira bowdeni
 * †Paupospira moorei – type locality for species
 * †Paupospira tropidophora
 * Pecopteris villosa.jpg †[[Pecopteris]]
 * †Pecopteris cisti
 * †Pecopteris clintoni
 * †Pecopteris miltonii
 * †Pecopteris polymorpha
 * †Pecopteris pseudovestita – tentative report
 * †Pecopteris serpillifolia – tentative report
 * †Pecopteris squamosa
 * †Pelagiella
 * †Pellecrinus
 * †Pellecrinus hexadactylus
 * †Pemtremites
 * †Pemtremites patei
 * †Penniretepora
 * †Pennsylvanioxylon
 * †Pennsylvanioxylon nauertianum
 * †Pentacystis
 * †Pentacystis gibsoni
 * †Pentacystis wykoffi
 * †Pentagonia
 * †Pentagonia biplicata
 * †Pentamerella
 * †Pentamerella arata
 * †Pentamerella pavilionensis
 * †Pentameroceras
 * †Pentameroceras cumingsi
 * †Pentamerus
 * †Pentamerus fornicata
 * †Pentamerus oblungus
 * †Pentaramicrinus
 * †Pentaramicrinus bimagnaramus
 * Pentremites Glen Dean Fm KY.jpg †[[Pentremites]]
 * †Pentremites abruptus
 * †Pentremites angularis
 * †Pentremites buttsi
 * †Pentremites clavatus
 * †Pentremites conoideus
 * †Pentremites elegans
 * †Pentremites girtyi
 * †Pentremites halli
 * †Pentremites hambachi
 * †Pentremites maccalliei
 * †Pentremites okawensis
 * †Pentremites patei
 * †Pentremites platybasis
 * †Pentremites pyramidatus
 * †Pentremites pyriformis
 * †Pentremites robustus
 * †Pentremites springeri
 * †Pentremites symmetricus
 * †Pentremites tulilpaformis
 * †Pentremites tulipaformis
 * †Pentremites welleri
 * †Pentremitidea – tentative report
 * †Pentremitidea approximata
 * †Perditocardinia
 * †Perditocardinia dubia
 * †Periastron
 * †Periastron perforatum
 * †Periastron reticulatum
 * †Pericyclus
 * †Periechocrinites
 * Periechecrinidae - Periechocrinus costatus.JPG †[[Periechocrinus]]
 * †Periechocrinus umbrosus
 * †Peronopora
 * †Peronopora decipiens
 * †Petalocrinus
 * †Petalocrinus inferior
 * †Petalocrinus longus
 * †Petigopora
 * †Petrocrania
 * †Petrocrania scabiosa
 * †Phacelocrinus
 * †Phacelocrinus longidactylus
 * Phacops rana crassituberculata lateral.jpg †[[Phacops]]
 * †Phaenopora
 * †Phaenopora ensiformis
 * †Phaenoschisma
 * †Phanocrinus
 * †Phanocrinus formosus
 * †Phanocrinus parvaramus
 * †Phestia
 * †Philhedra
 * †Philhedra crenistriata
 * †Philhedra laelia
 * †Philhedra stewarti
 * †Phillipsia
 * †Phillipsia bufi
 * †Phillipsia bufo
 * †Phimocrinus – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Pholadomorpha
 * †Pholadomorpha pholadiformis
 * †Pholidops – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Pholidostrophia
 * †Pholidostrophia iowaensis
 * †Phosphannulus
 * †Phractopora
 * †Phragmoceras
 * †Phragmoceras parvum
 * †Phragmodictya
 * †Phragmodictya catilliforme
 * †Phragmolites
 * †Phragmolites dyeri
 * †Phragmolites triangularis
 * †Phymatophyllum
 * †Phymatophyllum multiplicatum
 * †Physospongia
 * †Physospongia colletti
 * †Physospongia dawsoni
 * †Pietzschia
 * †Pietzschia polyupsilon
 * †Pinna
 * †Pinna subspatulata
 * †Pinnularia
 * †Pisocrinus
 * †Pisocrinus benedicti – or unidentified comparable form
 * †Pisocrinus campana
 * †Pisocrinus gemmiformis
 * †Pisocrinus gorbyi
 * †Pisocrinus quinquelobus
 * Plaesiomyiidae - Plesiomys subquadrata.JPG †[[Plaesiomys]]
 * †Plaesiomys subquadrata
 * †Plaesiomys subquatra
 * †Planalvus – tentative report
 * †Planalvus densa
 * †Plasmopora
 * †Plasmopora follis
 * †Platyaxum
 * †Platyaxum alicornis
 * †Platyaxum foliatum
 * †Platyaxum orthosoleniskum
 * †Platyaxum undosum
 * PlatycerasLoganOhio.jpg †[[Platyceras]]
 * †Platyceras argo – tentative report
 * †Platyceras brownsportense
 * †Platyceras bucculentum
 * †Platyceras clintonensis
 * †Platyceras cornutum – or unidentified comparable form
 * †Platyceras crassum
 * †Platyceras daytonense
 * †Platyceras echinatum
 * †Platyceras erectum
 * †Platyceras lineatum
 * †Platyceras niagarense
 * †Platyceras niagarensis
 * †Platyceras plebium
 * †Platycrinites
 * †Platycrinites bonoensis
 * †Platycrinites hemispericus
 * †Platycrinites hemisphericus
 * †Platycrinites nodostriatus
 * †Platycrinites saffordi
 * †Platycrinites safordi
 * †Platycrinus
 * †Platyrachella
 * †Platyrachella macbridei
 * †Platyrachella oweni
 * PlatystrophiaOrdovician.jpg †[[Platystrophia]]
 * †Platystrophia acutilirata
 * †Platystrophia annieana
 * †Platystrophia attenuata
 * †Platystrophia biforata – or unidentified comparable form
 * †Platystrophia clarksvillensis
 * †Platystrophia cummingsi
 * †Platystrophia cypha
 * †Platystrophia daytonensis
 * †Platystrophia elkhornensis
 * †Platystrophia foerstei
 * †Platystrophia hopensis
 * †Platystrophia laticosta
 * †Platystrophia moritura
 * †Platystrophia ponderosa
 * †Platyzona
 * †Platyzona trilineata – type locality for species
 * †Pleapopleurus
 * †Pleapopleurus tenuicostatus
 * †Pleapopleurus tenuicostus
 * †Pleapopluerus
 * †Pleapopluerus tenuicostatus – tentative report
 * †Plectatrypa
 * †Plectodonta
 * †Plectodonta elegantula
 * †Plectodonta transversalis
 * †Plectorthis
 * †Plectorthis plicatella
 * †Plectospira
 * †Plectospira sexplicata
 * †Plectospirifer
 * †Pleurocornu
 * †Pleurocornu amissum – or unidentified comparable form
 * Pleurodictyum americanum Kashong.jpg †[[Pleurodictyum]]
 * †Pleurodictyum cornu
 * †Pleurodictyum cylindricum
 * †Pleurodictyum insigne
 * †Pleurodictyum maximum
 * †Pleurodictyum michelinoidea
 * †Pleurodictyum papillosa
 * †Pleurodictyum planum
 * †Pleurodictyum speciosus
 * †Pleurodictyum spiculata
 * †Pleurodictyum wardi
 * †Pleuronotus
 * †Pleuronotus decewi
 * †Pleurorthoceras
 * †Pleurorthoceras clarksvillense
 * †Poleumita
 * †Poleumita scamnata
 * Polygnathus Pa elements.png †[[Polygnathus]]
 * †Polypora
 * †Polypora corticosa
 * †Polypora multispinosa
 * †Polypora nodolinearis
 * †Polysacos – type locality for genus
 * †Polysacos vickersianum – type locality for species
 * †Polytryphocycloides
 * †Polyxylon
 * †Polyxylon elegans
 * †Portlockiella
 * †Poterioceras – tentative report
 * †Poteriocrinites
 * †Poteriocrinites amplus – type locality for species
 * †Potonieisporites
 * †Potonieisporites elegans
 * †Prasopora
 * †Prasopora hospitalis
 * Priscopedatus
 * †Prismopora
 * †Prismopora serrulata
 * †Pristiograptus
 * †Pristiograptus jaegeri
 * †Probillingsites
 * Proboscina
 * †Prodromites
 * †Prodromites gorbyi
 * †Productus
 * †Productus cestriensis
 * †Productus fasiculatus
 * Proetus concinnus reconstruction cropped.png †[[Proetus (trilobite)|Proetus]]
 * †Proetus crassimarginatus
 * †Proetus folliceps
 * †Prolecanites
 * †Prolecanites lyoni
 * †Prolecythiocrinus
 * †Prolecythiocrinus problematicus
 * †Promexyele
 * †Promexyele bairdi
 * †Promexyele peyeri – type locality for species
 * †Propora
 * †Propora exigua
 * †Prosolarium
 * †Prosolarium crenulata
 * †Protaraea
 * †Protaraea richmondensis
 * †Protatrypa
 * †Protatrypa marginalis
 * †Proteonina
 * †Proteonina cumberlandiae
 * †Protocalamites
 * †Protocalamites dorfii
 * †Protocanites
 * †Protochonetes – tentative report
 * †Protokoinoceras
 * †Protokoinoceras medullare
 * †Protolepidodendron
 * †Protolepidodendron microphyllum
 * †Protoleptostrophia
 * †Protoleptostrophia perplana
 * †Protomegastrophia
 * †Protoniella
 * †Protoniella parva – or unidentified related form
 * †Protophragmoceras
 * †Protophragmoceras hercules
 * †Protosalvinia
 * †Protosalvinia rarenna
 * Psammosphaera
 * Reconstruction of Psaronius.jpg †[[Psaronius]]
 * †Pseudagnostus
 * †Pseudastrorhiza
 * †Pseudastrorhiza conica
 * †Pseudaviculopecten
 * †Pseudaviculopecten indianensis
 * †Pseudoatrypa
 * †Pseudoatrypa devoniana
 * †Pseudobythocypris
 * †Pseudocolpomya
 * †Pseudocolpomya elongata
 * †Pseudolingula
 * †Pseudostrohiza
 * †Pseudostrohiza delicata
 * †Pseudosyrinx
 * †Pseudosyrinx gigas
 * †Pseudozygopleura
 * †Pseudozygopleura yandellana – type locality for species
 * †Psiloconcha
 * †Psiloconcha grandis
 * †Psilokirkbyella
 * †Psilokirkbyella ozarkensis
 * [[File:Naturalis Biodiversity Center - RMNH.MOL.318252 - Pteria fibrosa (Reeve, 1857) - Pteriidae - Mollusc shell.jpeg|thumb|upright|Interior and exterior of the shell of a Pteria, or winged oyster]] †[[Pteria (genus)|Pteria]]
 * †Pterinea
 * †Pterinea brisa
 * †Pterinea demissa
 * †Pterinopecten
 * †Pterinopecten hermes
 * †Pterinopecten princeps
 * †Pterocephalia
 * †Pterotheca
 * †Pterotheca expansa
 * †Pterotheca intermedia – type locality for species
 * †Pterotocrinus
 * †Pterotocrinus acutus
 * †Pterotocrinus armatus – or unidentified comparable form
 * †Pterotocrinus bifurcatus
 * †Pterotocrinus birfurcatus
 * †Pterotocrinus convexus
 * †Pterotocrinus depressus
 * †Pterotocrinus lingulaformis
 * †Pterotocrinus rugosus
 * †Pterotocrinus spatulatus
 * Pterygotus anglicus reconstruction.jpg †[[Pterygotus]]
 * †Pterygotus ventricosus
 * †Ptychocarpus
 * †Ptychocarpus unitus
 * †Ptychopleurella
 * †Ptylopora
 * †Punctatisporites
 * †Punctatisporites decorus
 * †Punctatisporites flavus
 * †Punctatisporites glaber
 * †Punctatisporites incomptus
 * †Punctatisporites minutus
 * †Punctatisporites nahannensis
 * †Punctatisporites obesus
 * †Punctatisporites orbicularis
 * †Punctatosporites
 * †Punctatosporites minutus
 * †Punctospirifer
 * †Punctospirifer obtusus
 * †Punctospirifer transversus
 * †Pustulocystis
 * †Pustulocystis ornatissimus
 * †Pycnosaccus
 * †Pycnosaccus laurelensis

Q

 * †Quasillinites
 * †Quasillinites diversiformis
 * †Quasillites – tentative report
 * †Quassilites

R

 * †Rafinesquina
 * †Rafinesquina alternata
 * †Rafinesquina ponderosa
 * †Raistrickia
 * †Raistrickia breveminens
 * †Raistrickia carbondalensis
 * †Raistrickia crinita
 * †Raistrickia crocea
 * †Raistrickia lowellensis
 * †Raistrickia subcrinita
 * †Raistrickia superba
 * †Raphistomina
 * †Raphistomina modesta – or unidentified comparable form
 * †Rasmussenoceras
 * †Rasmussenoceras variable
 * †Rectifenestella
 * †Rectifenestella tenax
 * †Rectobaidia
 * †Rectobaidia fragosa – or unidentified related form
 * †Reimannia
 * †Reimannia indianensis
 * †Renalcis – tentative report
 * †Renaultia
 * †Renaultia chaerophylloides
 * Reophax
 * †Reophax lachrymosa
 * †Resserella
 * †Resserella elegantula
 * †Resserella waldronensis
 * †Reticulariina
 * †Reticulariina salemensis
 * †Reticulariina spinosa
 * †Reticulatisporites
 * †Reticulatisporites polygonalis
 * †Reticulatisporites reticulatus
 * †Reticulitriletes
 * †Reticulitriletes falsus
 * †Reticulopteris
 * †Reticulopteris muensteri
 * †Retispira
 * †Retispira textilis – type locality for species
 * †Retoporina
 * †Retoporina striata
 * †Retrorsirostra
 * †Retrorsirostra carleyi
 * †Retzia
 * †Retzia raricosta
 * †Rhabdocarpus
 * †Rhabdocarpus mamillatus
 * †Rhabdocarpus mansfieldi – or unidentified comparable form
 * †Rhabdocarpus multistriatus
 * †Rhabdomeson
 * †Rhadinichthys
 * †Rhegmaphyllum – tentative report
 * †Rhegmaphyllum daytonensis
 * †Rhineoderma
 * †Rhineoderma nodulostriata – type locality for species
 * †Rhineoderma wortheni – type locality for species
 * †Rhinidictya
 * †Rhipdomella
 * †Rhipdomella perminuta
 * †Rhipidium
 * †Rhipidomella
 * †Rhipidomella hybrida
 * †Rhipidomella missouriensis
 * †Rhipidomella penelope
 * †Rhipidomella perminuta
 * †Rhipidomella tenuicosta – or unidentified comparable form
 * †Rhipidomella vanuxemi
 * †Rhipidothyris
 * †Rhombopora
 * †Rhombopora simplex
 * †Rhombotrypa
 * †Rhombotrypa quadrata
 * Rhynchonellidae - Rhynchonella species.JPG †[[Rhynchonella]]
 * †Rhynchonella gainesi
 * †Rhynchonella scobina
 * †Rhynchonella tenuistriata
 * †Rhynchopora
 * †Rhynchopora beecheri
 * †Rhynchopora perryensis – tentative report
 * †Rhynchopora rowleyi – tentative report
 * †Rhynchotrema
 * †Rhynchotrema denatum
 * †Rhynchotrema dentatum
 * †Rhynchotreta
 * †Rhynchotreta americana
 * †Rhysocamax
 * †Rhysocamax grandis
 * †Rhytimya
 * †Rhytimya byrnesis
 * †Rhytimya mickleboroughi
 * †Richmondoceras – type locality for genus
 * †Richmondoceras brevicameratum – type locality for species
 * †Rineceras
 * †Rineceras digonum – tentative report
 * †Romingerella
 * †Romingerella major – or unidentified comparable form
 * †Romingeria
 * †Romingeria commutata
 * †Romingeria fasciculata
 * †Romingeria umbellifera
 * †Romingeria uva
 * †Ropalonaria
 * † Rota
 * †Rotiphyllum
 * †Rotiphyllum calyculum
 * †Roundyella
 * †Roundyella mopacifa
 * †Rugomena
 * †Rugomena vetusta
 * †Rugosochonetes
 * †Rugosochonetes illinoisensis
 * †Rugosochonetes planumbona

S

 * †Saccocrinus
 * †Saccocrinus benedicti
 * †Saccocrinus christyi
 * †Saccosompsis
 * †Saccosompsis poterium
 * †Saffordotaxis
 * †Salpingostoma
 * †Salpingostoma buelli
 * †Salpingostoma richmondense
 * †Samaropsis
 * †Samaropsis crampii – or unidentified comparable form
 * †Sandalodus
 * †Sanguinolites
 * †Sanguinolites herricki – tentative report
 * †Sanguinolites tropidophorus
 * †Sapphicorhynchus
 * †Sapphicorhynchus sappho
 * †Sarocrinus
 * †Sarocrinus nitidus
 * †Savitrisporites
 * †Savitrisporites nux
 * †Scalarituba
 * †Scalarituba missouriensis
 * †Scalites
 * †Scalites richmondensis
 * †Scenophyllum
 * †Scenophyllum conigerum
 * †Schellwienella
 * †Schellwienella ulrichi
 * †Schizobolus
 * †Schizobolus concentricus
 * †Schizonema – tentative report
 * †Schizophoria
 * †Schlotheimophyllum
 * †Schlotheimophyllum typicum
 * †Schoenaster
 * †Schoenaster fimbriatus
 * †Schopfites
 * †Schopfites colchesterensis
 * †Schopfites dimorphus
 * †Schuchertella
 * †Schuchertella costatula
 * †Schuchertella lens – tentative report
 * †Schuchertella subplana
 * †Schuchertoceras
 * †Schuchertoceras geniculatum
 * †Schuchertoceras prolongatum
 * †Schuchertoceras rotundum
 * †Schulzospora
 * †Schulzospora rara
 * Scytalocrinidae - Scytalocrinus.JPG †[[Scytalocrinus]]
 * †Scytalocrinus decadactylus
 * †Scytalocrinus disparilis – or unidentified comparable form
 * †Scytalocrinus robustus
 * †Senftenbergia
 * †Senftenbergia pennaeformis
 * †Septopora
 * †Septopora cestriensis
 * †Septopora subquadrans
 * †Serpulopsis
 * †Serpulopsis jacobschapelensis
 * †Serpulospira
 * †Serpulospira planispira
 * †Setigerites
 * †Setigerites setiger
 * †Setigerites setigerus
 * †Shideleroceras
 * †Shideleroceras gracile
 * †Shivaella
 * †Shivaella nicklesi
 * †Sibyrhynchus – type locality for genus
 * †Sibyrhynchus denisoni – type locality for species
 * †Siderella
 * †Siderella scotti
 * †Sidetes
 * †Sievertsia
 * Stanhope Tree - geograph.org.uk - 2531669.jpg †[[Sigillaria]]
 * †Sigillaria brardii
 * †Sigillaria davreuxi
 * †Sigillaria kidstoni – tentative report
 * †Sigillaria mamillaris – or unidentified comparable form
 * †Sigillaria monostigma
 * †Sigillaria scutellata
 * †Sigillariostrobus
 * †Sigillariostrobus quadrangularis
 * †Silenites
 * †Silenites warei – or unidentified comparable form
 * †Sinochonetes
 * †Sinochonetes lepidus
 * †Sinuites
 * †Sinuites cancellatus
 * †Sinuites subcompressa
 * †Sinuitina
 * †Siphonophrentis
 * †Siphonophrentis elongata
 * †Siphonophrentis planima
 * †Siphonophrentis yandelli
 * †Skelidorygma
 * †Skelidorygma subcardiiformis
 * †Skenidioides
 * Sorosphaera – tentative report
 * †Sowerbyella
 * †Sowerbyella rugosa
 * †Spackmanites
 * †Spackmanites facierugosus – or unidentified comparable form
 * †Spackmanites habibii
 * †Spathella
 * †Spathella illinoiensis
 * †Spathiocaris
 * †Spathognathodus
 * †Spathognathodus snadjri – or unidentified comparable form
 * †Spatiopora
 * †Sphaerexochus
 * †Sphaerexochus romingeri
 * †Sphaerirhynchia
 * †Sphaerirhynchia stricklandi
 * †Sphaerocodium
 * †Sphaerocyclus – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Sphaerocyclus tuber
 * †Sphenophyllostachys
 * Sphenophyllum miravallis cropped.jpg †[[Sphenophyllum]]
 * †Sphenophyllum cuneifolium
 * †Sphenophyllum emarginatum
 * †Sphenophyllum hauchecornei
 * †Sphenophyllum myriophyllum
 * †Sphenophyllum plurifoliatum
 * †Sphenopteris
 * †Sphenopteris broadheadi
 * †Sphenopteris shatzlarensis
 * †Sphenosphaera
 * †Sphenosphaera mohri
 * †Sphenosphaera subangularis – type locality for species
 * †Spinocyrtia
 * †Spinocyrtia euryteines
 * †Spinozonotriletes
 * †Spinulicosta
 * †Spinulicosta spinulicosta
 * †Spinyplatyceras
 * †Spinyplatyceras milleri
 * Spirifer perlamosus pedunculate valve.jpg †[[Spirifer]]
 * †Spirifer angusta
 * †Spirifer bifurcatus
 * †Spirifer byrnesi
 * †Spirifer crawfordsvillensis
 * †Spirifer floydensis – tentative report
 * †Spirifer fornaculus
 * †Spirifer increbescens
 * †Spirifer keokuk
 * †Spirifer macrus
 * †Spirifer montgomeryensis
 * †Spirifer mundulus – or unidentified comparable form
 * †Spirifer pellaensis – tentative report
 * †Spirifer rostellatus
 * †Spirifer shepardi – or unidentified related form
 * †Spirifer shephardi – or unidentified related form
 * †Spirifer tenuicostatus
 * †Spirifer tenuimarginatus
 * †Spirifer varicosus
 * †Spirifer veronensis – or unidentified comparable form
 * †Spirifer washingtonensis
 * Spiropteris
 * Spirorbis spirorbis Scotland.jpg [[Spirorbis]]
 * †Spiroscala
 * †Sporangites
 * †Sporangites huronensis
 * †Springericrinus
 * †Springericrinus doris – tentative report
 * †Springericrinus magniventrus – tentative report
 * †Spyroceras
 * †Spyroceras nuntium
 * †Stacheia
 * †Stacheia cicatrix
 * †Stacheia trepeilopsiformis
 * †Staurocephalus
 * †Stegerhynchus
 * †Stegerhynchus indianense
 * †Stegerhynchus indianensis
 * †Stegerhynchus neglectum – or unidentified comparable form
 * †Stegerhynchus neglectus
 * †Stegerhynchus whitii
 * †Stelastellara
 * †Stelastellara parvula
 * †Stelliporella
 * †Stelliporella lamellata – or unidentified comparable form
 * †Stenoloron
 * †Stenoloron swallovana – type locality for species
 * †Stenopareia
 * †Stenoscisma
 * †Stenoscisma explanatum
 * †Stephanocrinus
 * †Stephanocrinus cornetti
 * †Stephanocrinus elongatus
 * †Stephanocrinus gemmiformis
 * †Stephanocrinus obpyramidalis
 * †Stephanocrinus quinquepartitus
 * †Stereolasma
 * †Stereolasma exile – tentative report
 * †Stereolasma parvulum
 * †Stethacanthulus – type locality for genus
 * †Stethacanthulus longipeniculus – type locality for species
 * †Stethacanthulus meccaensis
 * Steth pair1 cropped.jpg †[[Stethacanthus]]
 * †Stethacanthus altonensis
 * †Stethacanthus longipeniculus – type locality for species
 * †Stictoporina
 * †Stictoporina granulifera
 * †Stigmaria
 * †Stigmaria ficoides
 * †Stigmaria wedingtonensis
 * †Stigmatella
 * †Stigmatella dubia
 * †Stinocrinus
 * †Stiptocrinus
 * †Stiptocrinus benedicti
 * †Stiptocrinus howardi
 * †Stiptocrinus ornatus
 * Stomatopora
 * †Straparollus
 * †Straparollus planodiscus
 * †Straparollus quadrivolvis – type locality for species
 * †Straparollus spergenensis – type locality for species
 * †Streblotrypa
 * †Streblotrypella
 * †Streptelasma
 * †Streptelasma divaricans
 * †Streptelasma vagans
 * †Striatopora
 * †Striatopora alba – tentative report
 * †Striatopora bellistriata
 * †Striatopora cavernosa
 * †Striatopora flexuosa
 * †Stricklandia – tentative report
 * †Striispirifer
 * †Stromatopora
 * †Stromatopora antiqua
 * †Stropeodonta
 * †Stropheodonta
 * †Stropheodonta demissa
 * †Strophochonetes
 * †Strophochonetes novascotica
 * †Strophodonta
 * †Strophodonta demissa
 * Strophomena costellata brachial.jpg †[[Strophomena]]
 * †Strophomena concordensis
 * †Strophomena erratica
 * †Strophomena extenuata
 * †Strophomena fissicosta
 * †Strophomena inequistriata
 * †Strophomena neglecta
 * †Strophomena nutans
 * †Strophomena planoconvexa
 * †Strophomena planumbona
 * †Strophomena scottensis
 * †Strophomena sulcata
 * †Strophomena vestusta
 * †Strophonella
 * †Strophonella semifasciata
 * †Strophonella williamsi
 * †Strophostylus
 * †Strophostylus cyclostomus
 * †Styliolina
 * †Stylolina
 * †Subglobosochonetes
 * †Sulcatina
 * †Sulcatina sulcata
 * †Sulcoretepora
 * †Sumixam – type locality for genus
 * †Sumixam maximus – type locality for species
 * †Sutcliffia
 * †Sutcliffia insignis
 * †Synbathocrinus
 * †Synbathocrinus swallovi
 * †Synbathocrinus swallowvi
 * †Synchysidendron
 * †Synchysidendron resinosum
 * Syringoporid.jpg †[[Syringopora]]
 * †Syringopora hisingeri
 * †Syringopora monroensis
 * †Syringopora perelegans
 * †Syringoporida
 * †Syringothyris
 * †Syringothyris subcuspidatus – or unidentified comparable form
 * †Syringothyris textus

T

 * †Tabulipora
 * †Tabulipora cestriensis
 * †Tabulipora ramosa
 * †Taeniodictya
 * †Tamiobatis
 * †Tamiobatis springeri
 * †Tasmanites
 * Taxocrinidae - Taxocrinus.JPG †[[Taxocrinus]]
 * †Taxocrinus colletti
 * †Taxocrinus ungula – tentative report
 * †Tentaculites
 * †Tentaculites gracilistriatus
 * †Tentaculites sterlingensis
 * †Tetradium
 * †Tetradium huronense
 * †Tetranota
 * †Tetranota wisconsinensis
 * †Tetrasacculus
 * †Tetrasacculus stewarte – tentative report
 * †Thalamocrinus
 * ThalassinoidesIsrael.JPG †[[Thalassinoides]]
 * †Thalassoinoides
 * †Thamniscus
 * †Thamnopora
 * †Thamnopora limitaris
 * †Thamnoptychia
 * †Thamnoptychia alpenensis
 * †Thamnoptychia tuberculata – type locality for species
 * †Thecia
 * †Thecia minor – or unidentified comparable form
 * †Thuraminoides
 * †Thuraminoides sphaeroidalis
 * Thurammina
 * †Thurammina arenicorna
 * †Thurammina limbata
 * †Thuramminoides
 * †Thuramminoides sphaeroidalis
 * †Thuroholia
 * †Thuroholia spicatus – type locality for species
 * †Thymospora
 * †Thymospora pseudothiessenii
 * †Tolypaminna
 * †Tolypaminna frizzelli
 * †Tolypaminna rotula
 * †Tolypammina
 * †Tolypammina bransoni
 * †Tolypammina bulbosa
 * †Tolypammina cyclops
 * †Tolypammina gersterensis
 * †Tolypammina jacobschapelensis
 * †Tolypammina laocoon – or unidentified related form
 * †Tolypammina rotula
 * †Torispora
 * †Torispora securis
 * †Torynifer
 * †Torynifer pseudolineata
 * †Torynifer pseudolineatus
 * †Torynifer salemensis
 * †Torynifer setiger
 * †Tremanotus
 * †Tremanotus chicagoensis
 * †Trematis
 * †Trematis millepuntata
 * †Trematis millipunctata
 * †Trematocystis
 * †Trematocystis magniporatus
 * †Trematopora
 * †Trepeilopsis
 * †Trepeilopsis glomospiroides
 * †Trepeilopsis recurvidens
 * †Trepeilopsis spiralis
 * Proteoceratidae - Treptoceras duseri cropped.jpg †[[Treptoceras]]
 * †Treptoceras cincinnatiensis
 * †Treptoceras duseri
 * †Treptoceras fosteri
 * †Treptoceras hitzi
 * †Triamara
 * †Triamara laevis
 * †Triamara tumida
 * †Triamara ventricosa – type locality for species
 * †Triangulotarbus – type locality for genus
 * †Triangulotarbus terrehautensis – type locality for species
 * †Tricopelta
 * †Tricopelta breviceps
 * Tricrepicephalus texanus CRF.jpg †[[Tricrepicephalus]]
 * †Trigonocarpus
 * †Trigonoglossa
 * †Trimerella
 * †Trimerus
 * †Trimerus delphinocephalus
 * †Trimoceras
 * †Trimoceras gilberti
 * †Triplesia
 * †Triplesia putillus
 * †Triquitrites
 * †Triquitrites additus
 * †Triquitrites bransonii
 * †Triquitrites exiguus
 * †Triquitrites minutus
 * †Triquitrites protensus
 * †Triquitrites spinosus
 * †Triquitrites subspinosus
 * †Trochonema
 * †Trochonema madisonense
 * †Trochonema umbilicata – or unidentified comparable form
 * †Trochophyllum
 * †Troosticrinus
 * †Troosticrinus sanctipaulensis
 * †Trophocrinus
 * †Trophocrinus tumidus
 * †Tropidocaris
 * †Tropidoleptus
 * †Tropidoleptus carinatus
 * †Tryplasma
 * †Tryplasma parva
 * †Tubelelloides
 * †Tubelelloides longus
 * †Tuberculatosporites
 * †Tuberculatosporites robustus
 * †Tubulelloides
 * †Turneropterum – type locality for genus
 * †Turneropterum turneri – type locality for species
 * †Turrilepas
 * †Twenhofelella
 * †Twenhofelella waldroni – type locality for species
 * †Tylothyris

U

 * †Undulabucania
 * †Undulabucania gorbyi – type locality for species
 * †Unispirifer
 * †Unispirifer lateralis
 * †Unispirifer rundlensis – or unidentified related form
 * †Uperocrinus
 * †Uperocrinus apheles

V

 * †Valvisporites
 * †Vandelooaster
 * †Vandelooaster plicatilis
 * †Vaurealispongia
 * †Vaurealispongia minuta – type locality for species
 * †Vermiforichnus
 * †Vermiformichnus
 * †Verrucosisporites
 * †Verrucosisporites microtuberosus
 * †Verrucosisporites verrucosus
 * †Vesicaspora
 * †Vesicaspora wilsonii
 * †Vesicasporites
 * †Vesicasporites wilsonii
 * †Vestispora
 * †Vestispora costata
 * †Vestispora fenestrata
 * †Vestispora foveata
 * †Vestispora laevigata
 * †Vestispora pseudoreticulata
 * †Voiseyella
 * †Voiseyella novamexicana
 * †Voiseyells
 * †Voiseyells novamexicana – or unidentified related form
 * †Vorticina
 * †Vorticina cyrtolites

W

 * †Waltzispora
 * †Waltzispora prisca
 * †Warsawia
 * †Warsawia lateralis
 * †Waylandella
 * †Waylandella dartyensis
 * †Welleroceras
 * †Welleroceras liratum
 * †Whitfieldella
 * †Whitfieldella intermedia
 * †Whitfieldella nitida
 * †Whitfieldoceras – tentative report
 * †Whitfieldoceras casteri
 * †Whittleseya
 * †Wilsonicrinus
 * †Wilsonicrinus discoideus
 * †Wilsoniella
 * †Wilsoniella saffordi
 * †Wilsonites
 * †Wilsonites circularis
 * †Wilsonites vesicatus
 * †Worthenopora
 * †Worthenopora spinosa

X

 * †Xenocrinus

Y

 * †Youngiella – tentative report

Z

 * †Zaphrenthis
 * †Zaphrenthis aequus
 * †Zaphrenthis phrygia
 * †Zeacrinites
 * †Zeacrinites doverensis
 * †Zeacrinites trapezinatus
 * †Zeacrinites wortheni
 * †Zittelloceras
 * †Zittelloceras hitzi
 * †Zittelloceras lentidilatatum
 * †Zittelloceras shidleri
 * †Zonidiscus
 * †Zonidiscus youngi
 * ZoophycosMississippian.jpg †[[Zoophycos]]
 * †Zophocrinus
 * †Zophocrinus howardi
 * †Zygospira
 * †Zygospira modesta