List of the prehistoric life of Idaho

This list of the prehistoric life of Idaho contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Idaho.

Selected Paleozoic taxa of Idaho

 * †Acrothyra
 * †Adrianites
 * Agnostus pisiformis Kinnekulle 1 CRF.jpg †[[Agnostus]]
 * †Amplexus
 * † Ananias
 * Archaeolithophyllum
 * †Atrypa
 * †Aulopora
 * †Aviculopecten
 * †Aviculopecten kaibabensis – or unidentified comparable form
 * † Avonia
 * †Bathyuriscus
 * †Benthamaspis
 * †Caninia
 * †Cardiograptus
 * †Chancia
 * †Chonetes
 * †Chonetes logani
 * †Cleiothyridina
 * †Cleiothyridina sublamellosa
 * Climacograptus wilsoni Graptolite Fossils from Dob%27s Linn Scotland.jpg †[[Climacograptus]]
 * †Climacograptus bicornis
 * †Climacograptus innotatus
 * †Climacograptus scalaris – or unidentified comparable form
 * †Composita
 * †Composita humilis
 * †Composita idahoensis – type locality for species
 * †Composita mira – or unidentified comparable form
 * †Composita sigma
 * †Composita subquadrata
 * †Composita subtilita – or unidentified comparable form
 * †Composita sulcata
 * †Cyrtograptus
 * †Cystodictya
 * †Dictyonema
 * †Didymograptus
 * †Didymograptus extensus
 * †Diplograptus
 * †Edmondia
 * †Ehmaniella
 * †Elrathia
 * †Elrathina
 * †Euomphalus
 * †Fenestella
 * †Gastrioceras – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Girvanella
 * †Gogia
 * †Goniograptus
 * †Haplophrentis
 * †Helcionella
 * Helicoprion bessonovi cropped.png †[[Helicoprion]]
 * †Helicoprion davisii – type locality for species
 * †Hintzeia
 * †Hyolithes
 * †Isograptus
 * †Kazakhstania
 * †Kootenia
 * †Lingula
 * †Lingulella
 * †Lithostrotion
 * †Margaretia
 * †Martinia
 * †Micromitra
 * †Monograptus
 * †Monograptus convolutus
 * †Morania
 * †Naticopsis
 * †Neospirifer
 * †Niobe – tentative report
 * †Obolus
 * †Ogygopsis
 * [[File:Olenoides superbus, Late Middle Cambrian, Upper Marjum Formation, House Range, Millard County, Utah, USA - Houston Museum of Natural Science - DSC01415.JPG|thumb|upright=0.672|Fossil of the Cambrian trilobite Olenoides]] †[[Olenoides]]
 * †Orthotheca
 * †Oryctocephalus
 * †Pagetia
 * Palaeoaplysina
 * †Paterina
 * †Pelagiella
 * †Peronopsis
 * †Phyllograptus
 * †Plaesiomys
 * †Platyceras
 * †Platycrinites
 * †Platystrophia
 * †Poulsenia
 * †Prodentalium
 * Proetus concinnus reconstruction cropped.png †[[Proetus (trilobite)|Proetus]]
 * †Protopliomerella
 * †Protospongia
 * †Quadratia
 * †Selkirkia
 * †Siphonodendron
 * †Spirifer
 * †Spirifer brazerianus
 * †Spiriferina
 * †Strophomena
 * Syringoporid.jpg †[[Syringopora]]
 * †Tetragraptus
 * †Tetrataxis
 * †Thoracocare
 * †Urotheca
 * †Wilkingia
 * †Worthenia – tentative report
 * †Zacanthoides

Selected Mesozoic taxa of Idaho

 * †Albanites
 * †Anaflemingites
 * †Anasibirites
 * †Anemia
 * Arcestes cropped 1.png †[[Arcestes]] – tentative report
 * †Arctomeekoceras
 * †Aspenites
 * Astarte
 * †Aviculopecten – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Aviculopecten altus – type locality for species
 * †Aviculopecten idahoensis
 * †Aviculopecten pealei – type locality for species
 * †Carteria – type locality for genus
 * †Ceccaisculitoides
 * †Ceccaisculitoides hammondi
 * Chlamys
 * †Claraia
 * †Claraia stachei
 * Corbicula
 * †Cryptaulax
 * †Cycadeoidea
 * Cymboscale.png †[[Cymbospondylus]]
 * †Dagnoceras
 * †Dennstaedtia – tentative report
 * †Enoploceras
 * †Flemingites
 * †Germanonautilus
 * †Gervillia – report made of unidentified related form or using admittedly obsolete nomenclature
 * Gleichenia
 * †Gryphaea
 * †Grypoceras
 * †Hedenstroemia
 * Inoceramus steenstrup, world's largest fossil mollusk.jpg †[[Inoceramus]]
 * †Inyoites
 * †Inyoites oweni
 * †Lecanites
 * †Lingula
 * Lopha
 * †Meekoceras
 * †Meekoceras gracilitatis – type locality for species
 * †Megasphaeroceras
 * †Naticopsis – tentative report
 * †Nemacanthus
 * †Nemacanthus elegans – type locality for species
 * †Neogondolella
 * †Neospathodus
 * †Nerinea
 * Stephanoceratidae - Normannites braikenridgei cropped.jpg †[[Normannites]]
 * †Orthoceras
 * Ostrea
 * †Owenites
 * †Owenites koeneni – or unidentified comparable form
 * †Pagiophyllum
 * †Palaeophyllites – tentative report
 * †Phaedrysmocheilus
 * Pholadomya
 * †Pholadomya inaequiplicata
 * †Plagiostoma
 * †Platymya
 * Tainoceratidae - Pleuronautilus mariani.JPG †[[Pleuronautilus]]
 * †Protocardia
 * †Pseudomelania – tentative report
 * †Pteria – tentative report
 * †Rhaetina
 * †Rhynchonella – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Saurichthys
 * †Spiriferina
 * †Spiriferina roundyi
 * †Stephanoceras
 * †Tempskya
 * Tenontosaurus BW.jpg †[[Tenontosaurus]]
 * †Thamnasteria
 * †Trigonia
 * †Trigonia montanaensis
 * †Ussuria
 * †Ussurites
 * †Vex – type locality for genus
 * †Worthenia
 * †Wyomingites – type locality for genus
 * †Xenoceltites
 * †Xenoceltites cordilleranus
 * Xenodiscus besairiei.JPG †[[Xenodiscus]]

Selected Cenozoic taxa of Idaho

 * Abies
 * Acer
 * †Acritohippus
 * †Acritohippus isonesus
 * †Aepycamelus
 * †Aesculus
 * Agelaius
 * †Agelaius phoeniceus
 * †Agriotherium
 * †Alforjas – tentative report
 * Alnus
 * Amebelodon fricki.jpg †[[Amebelodon]]
 * Amelanchier
 * Anas
 * †Anas platyrhynchos
 * Anser
 * †Anser caerulescens
 * Antilocapra
 * †Antilocapra americana
 * Antrozous
 * †Antrozous pallidus
 * †Aphelops
 * †Archaeohippus
 * †Arctodus
 * †Arctodus simus
 * Ardea
 * †Ardea herodias
 * Baiomys
 * Betula
 * Bibio
 * Bison
 * †Bison antiquus – or unidentified comparable form
 * Bison latifrons fossil buffalo (Pleistocene; North America) 1 (15257877377).jpg †[[Bison latifrons]]
 * †Bison priscus
 * Boletina
 * †Bolitophila
 * †Bombus
 * Bonasa
 * †Bonasa umbellus
 * †Bootherium
 * †Bootherium bombifrons
 * †Borophagus
 * †Borophagus diversidens
 * †Borophagus hilli
 * †Borophagus pugnator
 * Brachycrus.jpg †[[Brachycrus]]
 * Brachylagus
 * †Brachylagus idahoensis
 * Branta
 * †Branta canadensis
 * Bucephala
 * †Camelops
 * †Camelops hesternus
 * Camponotus
 * Canis
 * †Canis dirus
 * †Canis ferox
 * †Canis latrans
 * †Canis lepophagus
 * Carya Morton 29-U-10.jpg [[Carya]]
 * Castor
 * †Castor californicus
 * †Castor canadensis
 * Ceanothus
 * Cedrela
 * Cercidiphyllum
 * Cervus
 * †Cervus elaphus – or unidentified comparable form
 * †Chamaecyparis
 * Chen
 * †Chrysolepis
 * Ciconia – tentative report
 * Ciconia maltha.jpg †[[Ciconia maltha]]
 * Comptonia
 * Cornus
 * †Cosoryx
 * Craigia
 * Crataegus
 * †Cunninghamia
 * Cygnus
 * Cynomys
 * †Dennstaedtia
 * †Diceratherium
 * †Dipoides
 * Dolichoderus
 * †Domnina
 * †Dromomeryx
 * Dytiscus
 * Elaphe
 * †Elaphe vulpina
 * †Epicyon
 * †Epicyon haydeni
 * †Equisetum
 * Equus
 * †Equus idahoensis
 * †Equus scotti
 * Equus simplicidens UMNH.jpg †[[Equus simplicidens]]
 * Erethizon
 * †Erethizon dorsatum
 * †Eucommia
 * †Euptelea
 * Falco
 * †Falco peregrinus
 * Felis
 * †Fraxinus
 * Gallinula
 * †Gallinula chloropus
 * †Garrya
 * †Gigantocamelus
 * Ginkgo
 * †Ginkgo adiantoides
 * †Gleditsia
 * Halesia
 * †Hemiauchenia
 * †Hemiauchenia macrocephala
 * Homo
 * †Homo sapiens
 * Homotherium serum.jpg †[[Homotherium]]
 * †Homotherium serum
 * Hydrangea
 * †Hypohippus
 * †Hypolagus
 * Ilex
 * Juglans
 * Larix
 * Lasiurus
 * Lasius
 * †Ledum
 * Lepus
 * Libocedrus
 * Limnephilus.auricula.jpg †[[Limnephilus]]
 * †Liriodendron
 * †Lithocarpus
 * Lontra
 * †Lontra canadensis
 * Lynx
 * †Lynx canadensis
 * †Lynx rufus
 * †Macrophya
 * Mahonia
 * †Mammut
 * Mammut americanum Sergiodlarosa.jpg †[[Mammut americanum]]
 * †Mammuthus
 * †Mammuthus columbi
 * †Megacamelus
 * †Megalonyx
 * †Megalonyx jeffersonii
 * †Megalonyx leptostomus
 * †Megantereon
 * Meleagris
 * †Meleagris gallopavo
 * Mergus
 * †Mergus merganser
 * †Merychyus
 * †Mesoreodon
 * Messor – tentative report
 * †Metalopex
 * Metasequoia
 * †Metasequoia occidentalis
 * †Michenia
 * Miohippus cropped.jpg †[[Miohippus]]
 * Mustela
 * Natrix
 * Neophrontops
 * Neotoma
 * †Niglarodon
 * †Nyssa
 * Odocoileus
 * Ondatra
 * †Ondatra zibethicus
 * †Osmunda
 * Ostrya
 * †Oxydactylus
 * †Palaeolagus – tentative report
 * Panthera
 * †Panthera leo
 * San Diego Paramylodon.jpg Paramylodon]] †Paramylodon
 * †Paramylodon harlani
 * †Parthenocissus
 * Pelecanus
 * †Pelecanus halieus – type locality for species
 * Perognathus
 * Peromyscus
 * Persea
 * Phalacrocorax
 * †Phalacrocorax auritus
 * Phenacomys
 * Phryganea
 * Picea
 * Pinus
 * Platanus
 * †Platygonus
 * Populus
 * Porzana
 * †Potamogeton
 * †Procastoroides
 * Procyon
 * †Procyon lotor
 * Promerycochoerus cropped.png-like oreodont Promerycochoerus both onshore and in the water. Robert Bruce Horsfall (1913).]] †Promerycochoerus
 * †Protolabis
 * Prunus
 * †Pseudolarix
 * †Pseudotsuga
 * Pterocarya
 * Puma
 * †Puma concolor
 * Quercus
 * Querquedula
 * Rangifer
 * †Rangifer tarandus
 * †Rhamnus
 * Rhododendron
 * Rhus
 * Rhynchotherium falconeri.png †[[Rhynchotherium]]
 * †Ribes
 * Rosa
 * Salix
 * Sassafras
 * †Satherium
 * †Satherium piscinarium
 * Scapanus
 * †Scapanus townsendii – or unidentified related form
 * Sciara
 * Sequoia
 * †Sequoia affinis
 * †Sequoiadendron
 * †Sequoiadendron chaneyi
 * †Simocyon
 * †Smilax
 * Smilodon fatalis.jpg †[[Smilodon]]
 * †Smilodon fatalis
 * †Sophora
 * †Sorbus
 * Sorex
 * †Sorex palustris
 * Spermophilus
 * †Spiraea
 * †Stegomastodon
 * †Stegomastodon mirificus
 * Sthenictis
 * †Symphoricarpos
 * Taxidea
 * †Taxidea taxus
 * Taxodium
 * Teleoceras Horsfall cropped.jpg †[[Teleoceras]]
 * Thamnophis
 * Thomomys
 * †Thomomys townsendii
 * †Thuja
 * †Ticholeptus
 * Tilia
 * †Trigonictis macrodon
 * †Tsuga
 * Typha
 * Ulmus
 * †Ungnadia
 * Ursus
 * Vaccinium.jpg †[[Vaccinium]]
 * †Vauquelinia
 * Vulpes
 * †Vulpes vulpes
 * Zelkova