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.

Paleozoic

Selected Paleozoic taxa of Idaho

†Acrothyra
†Adrianites
Assemblage of fossils of the Cambrian trilobite Agnostus
†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
Assemblage of fossils of the Cambrian graptolite Climacograptus
†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
Life restoration of the Permian Chimaera relative Helicoprion
†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
Fossil of the Cambrian trilobite Olenoides
†Olenoides
†Orthotheca
†Oryctocephalus
†Pagetia
Palaeoaplysina
†Paterina
†Pelagiella
†Peronopsis
†Phyllograptus
†Plaesiomys
†Platyceras
†Platycrinites
†Platystrophia
†Poulsenia
†Prodentalium
Restoration of the Silurian trilobite Proetus
†Proetus
†Protopliomerella
†Protospongia
†Quadratia
†Selkirkia
†Siphonodendron
†Spirifer
- †Spirifer brazerianus
†Spiriferina
†Strophomena
Fossil of the Devonian tabulate coral Syringopora
†Syringopora
†Tetragraptus
†Tetrataxis
†Thoracocare
†Urotheca
†Wilkingia
†Worthenia – tentative report
†Zacanthoides

Mesozoic

Selected Mesozoic taxa of Idaho

†Albanites
†Anaflemingites
†Anasibirites
†Anemia
Life restoration of two species of the Late Triassic ammonoid cephalopod Arcestes
†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
Diagram illustrating the Middle-Late Triassic ichthyosaur Cymbospondylus with an anachronistic human to scale.
†Cymbospondylus
†Dagnoceras
†Dennstaedtia – tentative report
†Enoploceras
†Flemingites
†Germanonautilus
†Gervillia – report made of unidentified related form or using admittedly obsolete nomenclature
Gleichenia
†Gryphaea
†Grypoceras
†Hedenstroemia
Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
†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
Fossilized shell of the Middle Jurassic ammonoid cephalopod Normannites
†Normannites
†Orthoceras
Ostrea
†Owenites
- †Owenites koeneni – or unidentified comparable form
†Pagiophyllum
†Palaeophyllites – tentative report
†Phaedrysmocheilus
Pholadomya
- †Pholadomya inaequiplicata
†Plagiostoma
†Platymya
Fossilized shell of the Carboniferous-Triassic nautiloid cephalopod Pleuronautilus
†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
Life restoration of the Early Cretaceous Iguanodon relative Tenontosaurus
†Tenontosaurus
†Thamnasteria
†Trigonia
- †Trigonia montanaensis
†Ussuria
†Ussurites
†Vex – type locality for genus
†Worthenia
†Wyomingites – type locality for genus
†Xenoceltites
- †Xenoceltites cordilleranus
Fossilized shells of the ammonoid cephalopod Xenodiscus
†Xenodiscus