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.
Paleozoic
Selected Paleozoic taxa of Idaho †Acrothyra †Adrianites †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 †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 †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 †Olenoides †Orthotheca †Oryctocephalus †Pagetia Palaeoaplysina †Paterina †Pelagiella †Peronopsis †Phyllograptus †Plaesiomys †Platyceras †Platycrinites †Platystrophia †Poulsenia †Prodentalium †Proetus †Protopliomerella †Protospongia †Quadratia †Selkirkia †Siphonodendron †Spirifer †Spirifer brazerianus †Spiriferina †Strophomena †Syringopora †Tetragraptus †Tetrataxis †Thoracocare †Urotheca †Wilkingia †Worthenia – tentative report †Zacanthoides
Mesozoic
Selected Mesozoic taxa of Idaho †Albanites †Anaflemingites †Anasibirites †Anemia †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 †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 †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 †Normannites †Orthoceras Ostrea †Owenites †Owenites koeneni – or unidentified comparable form †Pagiophyllum †Palaeophyllites – tentative report †Phaedrysmocheilus Pholadomya †Pholadomya inaequiplicata †Plagiostoma †Platymya †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 †Thamnasteria †Trigonia †Trigonia montanaensis †Ussuria †Ussurites †Vex – type locality for genus †Worthenia †Wyomingites – type locality for genus †Xenoceltites †Xenoceltites cordilleranus †Xenodiscus
Cenozoic
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