List of the Mesozoic life of Idaho

Last updated February 13, 2024

This list of the Mesozoic life of Idaho contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Idaho and are between 252.17 and 66 million years of age.

A

† Albanites ^[1]
- † Albanites americanus – type locality for species^[1]
- † Albanites sheldoni
† Ampezzopleura – tentative report
- † Ampezzopleura tenuis – or unidentified comparable form
† Amphitomaria – tentative report
- † Amphitomaria obscurecostata – type locality for species
† Anaflemingites
- † Anaflemingites russelli – type locality for species
† Anasibirites
- † Anasibirites desertorum
- † Anasibirites lindgreni
† Andangularia
- † Andangularia babylona – type locality for species
- † Andangularia occidentalis – type locality for species
† Anemia
- † Anemia fremonti
† Angularia
- † Angularia rectecostata – type locality for species
† Anthostylis
- † Anthostylis acanthophora
Life restoration of two species of the Late Triassic ammonoid cephalopod Arcestes
† Arcestes – tentative report
† Arctomeekoceras
- † Arctomeekoceras popovi – type locality for species
- † Arctomeekoceras tardum – type locality for species
† Aspenites
- † Aspenites acutus
† Aspiduriella – tentative report
- † Aspiduriella idahoensis – type locality for species
Astarte
- † Astarte meeki
† Astraeomorpha
- † Astraeomorpha crassisepta
† Astrocoenia
- † Astrocoenia idahoensis – type locality for species
† Austrotindaria
- † Austrotindaria canalensis
- † Austrotindaria svalbardensis
Mold fossil of a shell of the Early Devonian-Late Triassic bivalve Aviculopecten
† 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

B

† Bajarunia
- † Bajarunia jacksoni
- † Bajarunia pilata – type locality for species
- † Bajarunia pilatum
† Bakevellia
† Bakevillia
† Blodgettella
- † Blodgettella enormecostata – type locality for species
† Borestus – tentative report
† Brochidiella – type locality for genus
- † Brochidiella idahoensis – type locality for species

C

† Camptonectes
- † Camptonectes platessiformis
† Caribouceras – type locality for genus^[1]
- † Caribouceras slugense – type locality for species^[1]
† Carteria – type locality for genus
- † Carteria hotspringensis – type locality for species
† Ceccaisculitoides
- † Ceccaisculitoides hammondi
Fossillized shell of a Chlamys bivalve
Chlamys
† Chondrocoenia
- † Chondrocoenia idahoensis
- † Chondrocoenia schafhaeutli
† Cimolodon ^[2]
- † Cimolodon akersteni – type locality for species^[2]
† Claraia
- † Claraia extrema
- † Claraia stachei
† Clypites
- † Clypites tenuis – type locality for species
† Coelostylina
† Coenastraea
- † Coenastraea hyatti
† Columbites – type locality for genus
- † Columbites crassicostatus – type locality for species
- † Columbites dolnapaensis – or unidentified related form
- † Columbites isabellae – type locality for species
- † Columbites parisianus – type locality for species
A living Corbicula basket clam
Corbicula
† Cordillerites – type locality for genus
- † Cordillerites angulatus – type locality for species
† Coscaites
- † Coscaites crassus – type locality for species
Cossmannea
† Cryptaulax
- † Cryptaulax acutus – type locality for species
- † Cryptaulax gruendeli – type locality for species
- † Cryptaulax nezperceorum – type locality for species
- † Cryptaulax rhabdocolpoides
- † Cryptaulax wallowaensis – type locality for species
† Cryptorhynchia
- † Cryptorhynchia bearensis – type locality for species
† Ctenostreon
- † Ctenostreon gikshanensis – or unidentified comparable form
† Cupressinoxylon
† Cyathocoenia
- † Cyathocoenia squiresi
† Cycadeoidea
† Cylindrobullina – tentative report
Life restoration of the Middle-Late Triassic ichthyosaur Cymbospondylus
† Cymbospondylus

D

† Dagnoceras
- † Dagnoceras bonnevillense
- † Dagnoceras pealei
- † Dagnoceras zappanense – or unidentified related form
† Dalmatites
- † Dalmatites attenuatus
- † Dalmatites richardsi
† Dennstaedtia – tentative report
- † Dennstaedtia fremonti
† Deweveria
- † Deweveria dudresnayi – type locality for species
† Diatrypesis
- † Diatrypesis newelli – type locality for species
† Dicosmos
† Dieneroceras
- † Dieneroceras dieneri
† Distichophyllia
- † Distichophyllia norica

E

† Elysastraea
- † Elysastraea profunda
- † Elysastraea vancouverensis
† Endostoma – tentative report
† Enoploceras
- † Enoploceras newelli – type locality for species
† Entolioides
- † Entolioides utahensis
† Eocalliostoma
- † Eocalliostoma idahoensis – type locality for species
- † Eocalliostoma multicostata – type locality for species
† Eschericeratites – type locality for genus
- † Eschericeratites lytoceratoides – type locality for species
† Euchrysalis – tentative report
† Eucycloscala
- † Eucycloscala binodosa – or unidentified related form
† Euflemingites
- † Euflemingites cirratus – type locality for species
† Eumicrotis – report made of unidentified related form or using admittedly obsolete nomenclature
- † Eumicrotis curta
† Eumorphotis
- † Eumorphotis multiformis

F

† Fengshanites
- † Fengshanites americanus
† Flemingites
- † Flemingites aspenensis
- † Flemingites bannockensis
- † Flemingites cirratus

G

† Gablonzeria
- † Gablonzeria major
- † Gablonzeria profunda
† Germanonautilus
- † Germanonautilus montpelierensis – type locality for species
† Gervillia – report made of unidentified related form or using admittedly obsolete nomenclature
† Glabercolumbites – type locality for genus
- † Glabercolumbites glaber – type locality for species
Gleichenia
† Gnomohalorites
- † Gnomohalorites cordilleranus
† Grammatodon
- † Grammatodon haguei
Interior and exterior of a fossilized shell of the Late Triassic-Eocene marine bivalve Gryphaea
† Gryphaea
- † Gryphaea nebrascensis
- † Gryphaea planoconvexa
† Grypoceras
- † Grypoceras milleri – type locality for species
† Gudrunella – type locality for genus
- † Gudrunella triassica – type locality for species

H

Fossilized shell of the Triassic ammonoid cephalopod Hedenstroemia
† Hedenstroemia
- † Hedenstroemia kossmati
† Hellenites
- † Hellenites elegans – type locality for species
- † Hellenites idahoense
† Hemilecanites
- † Hemilecanites paradiscus
† Hemiprionites
- † Hemiprionites typus
† Heptastylis – tentative report
- † Heptastylis alpina
- † Heptastylis maculata
† Holocrinus
- † Holocrinus smithi

I

† Idahocolumbites
- † Idahocolumbites cheneyi
† Idahospira – type locality for genus
- † Idahospira multispirata – type locality for species
Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
† Inoceramus
† Inyoites
- † Inyoites oweni
† Isculitoides
- † Isculitoides originis – or unidentified related form

J

† Jeanbesseiceras
- † Jeanbesseiceras jacksoni – type locality for species
† Jurassiphorus
- † Jurassiphorus triadicus
† Juvenites – type locality for genus
- † Juvenites dieneri
- † Juvenites kraffti – type locality for species
- † Juvenites septentrionalis
- † Juvenites thermarum

K

† Kazakhstanites
- † Kazakhstanites dolnapensis
† Kiparisovites
- † Kiparisovites ovalis – or unidentified related form
† Kittliconcha
- † Kittliconcha obliquecostata

L

† Lamelliphorus
- † Lamelliphorus acutelaminatus – type locality for species
† Lanceolites
- † Lanceolites compactus
† Lecanites
- † Lecanites arnoldi
† Lepismatina
- † Lepismatina mansfieldi – type locality for species
† Leptochondria
- † Leptochondria curtocardinalis
- † Leptochondria occidanea
† Levicidaris
† Lingula
† Lingularia
† Liostrea
- † Liostrea strigilecula
† Litogaster
- † Litogaster turnbullensis – type locality for species
Fossilized shell of the Triassic-modern marine bivalve Lopha
Lopha
† Loxopleurus
- † Loxopleurus belliplicatus
† Lyosoma
- † Lyosoma powelli

M

† Marcouxia
- † Marcouxia astakhovi
† Maturifusus – tentative report
- † Maturifusus siphonatus – type locality for species
† Meekoceras
- † Meekoceras cristatum
- † Meekoceras gracilitatis – type locality for species
- † Meekoceras haydeni
- † Meekoceras micromphalus
- † Meekoceras mushbachanum
- † Meekoceras patelliforme
- † Meekoceras sanctorum
† Megasphaeroceras
- † Megasphaeroceras rotundum – or unidentified related form
† Metadagnoceras
- † Metadagnoceras pulchrum – or unidentified related form
- † Metadagnoceras unicum
† Metussuria
- † Metussuria waageni – type locality for species
† Microtaenia
- † Microtaenia variabilis
† Miocidaris
† Mojsvaroceras
- † Mojsvaroceras frenchi – type locality for species
† Myalina
- † Myalina postcarbonica

N

† Naticopsis – tentative report
† Nemacanthus
- † Nemacanthus elegans – type locality for species
† Neocolumbites
† Neogondolella
- † Neogondolella jubata
† Neoschizodus
† Neospathodus
- † Neospathodus homeri – tentative report
- † Neospathodus triangularis
† Nerinea
† Nodoconus – type locality for genus
- † Nodoconus nodiferus – type locality for species
† Nordophiceratoides
- † Nordophiceratoides adriani – type locality for species
- † Nordophiceratoides bartolinae – type locality for species
- † Nordophiceratoides catherinae – type locality for species
- † Nordophiceratoides gracilis – type locality for species
Fossilized shell of the Middle Jurassic ammonoid cephalopod Normannites
† Normannites
- † Normannites crickmayi – or unidentified comparable form
† Nuetzelopsis
- † Nuetzelopsis tozeri

O

† Obnixia – type locality for genus
- † Obnixia thaynesiana – type locality for species
† Omphaloptycha
- † Omphaloptycha jaworskii
† Orthoceras
Shell of an Ostrea , or oyster
Ostrea
- † Ostrea strigicula
† Owenites
- † Owenites koeneni – or unidentified comparable form

P

Fossilized foliage of the Carboniferous-Late Cretaceous plant Pagiophyllum
† Pagiophyllum
† Palaeastraea
† Palaeonarica
- † Palaeonarica lapwaiensis – type locality for species
† Palaeophyllites – tentative report
† Pamiroseris
- † Pamiroseris rectilamellosa
- † Pamiroseris smithi
† Paradelphinulopsis
- † Paradelphinulopsis vallieri
† Paragoceras
- † Paragoceras malayanus – or unidentified comparable form
- † Paragoceras timorensis – or unidentified related form
† Paranannites – type locality for genus
- † Paranannites aspenensis – type locality for species
† Paraphyllanthoxylon
- † Paraphyllanthoxylon idahoense
† Paullia
† Pentacrinus
- † Pentacrinus asteriscus
† Periallus – type locality for genus
- † Periallus woodsidensis – type locality for species
† Permophorus
- † Permophorus bregeri
- † Permophorus triassicus
† Phacelophyllia – report made of unidentified related form or using admittedly obsolete nomenclature
- † Phacelophyllia suttonensis
† Phacelostylophyllum
- † Phacelostylophyllum zitteli
† Phaedrysmocheilus
- † Phaedrysmocheilus idahoensis – type locality for species
Fossilized shell of the Early Triassic-Pliocene marine bivalve Pholadomya
Pholadomya
- † Pholadomya inaequiplicata
† Piarorhynchella
- † Piarorhynchella triassica
† Plagiostoma
- † Plagiostoma occidentalis
† Platymya
- † Platymya rockymontana
† Platyvillosus
- † Platyvillosus asperatus
† Pleuromya
- † Pleuromya subcompressa
Fossilized shell of the Carboniferous-Triassic nautiloid cephalopod Pleuronautilus
† Pleuronautilus
† Polygyrina – tentative report
- † Polygyrina subannulata – type locality for species
† Portneufia – type locality for genus
- † Portneufia episulcata – type locality for species
† Praelittorina
- † Praelittorina sepkoskii – type locality for species
† Praesibirites – tentative report
† Precorynella
† Preflorianites
- † Preflorianites toulai
† Procarnites
† Procolumbites
- † Procolumbites karataucicus
† Prohungarites
- † Prohungarites beyrichitoides – type locality for species
- † Prohungarites gutstadti
- † Prohungarites mckelvei
† Promathildia – tentative report
- † Promathildia multituberculata – type locality for species
† Promyalina
- † Promyalina putiatinensis
- † Promyalina spathi
† Pronoella
- † Pronoella cinnabarensis
- † Pronoella uintahensis
† Protocardia
- † Protocardia schucherti – or unidentified comparable form
† Protodonax
† Protogusarella – type locality for genus
- † Protogusarella smithi – type locality for species
† Protorcula – tentative report
- † Protorcula concava – type locality for species
† Pseudaspidites
- † Pseudaspidites wheeleri
† Pseudharpoceras
- † Pseudharpoceras idahoense
Fossilized shell of a Pseudomelania sea snail
† Pseudomelania – tentative report
† Pseudomonotis
- † Pseudomonotis idahoensis
- † Pseudomonotis pealei
† Pseudosageceras
- † Pseudosageceras multilobatum – type locality for species
† Pseudoscalites
- † Pseudoscalites elegantissimus – or unidentified comparable form
† Pteria – tentative report
- † Pteria ussurica – or unidentified comparable form
† Ptychomphalus – tentative report
- † Ptychomphalus protei – or unidentified related form
† Ptychostoma
- † Ptychostoma ornata – type locality for species
† Pyknotylacanthus – type locality for genus
- † Pyknotylacanthus spathianus – type locality for species
† Pyrgulifera
- † Pyrgulifera humerosa

Q

† Quenstedtia
- † Quenstedtia sublevis

R

† Retiophyllia
- † Retiophyllia clathrata – or unidentified comparable form
- † Retiophyllia dawsoni
- † Retiophyllia parviseptum
† Rhaetina
- † Rhaetina incurvirostra – type locality for species
Fossilized shell of the Silurian-Eocene articulate brachiopod Rhynchonella
† Rhynchonella – report made of unidentified related form or using admittedly obsolete nomenclature
† Rudolftruempyiceras
- † Rudolftruempyiceras apostolicum
- † Rudolftruempyiceras apostolicus

S

Fossilized skeleton of the Early Triassic-Middle Jurassic bony fish Saurichthys
† Saurichthys
- † Saurichthys elongatus – or unidentified comparable form
† Sibirites
- † Sibirites carinatus – type locality for species
† Silberlingeria
- † Silberlingeria bearlakensis
- † Silberlingeria coronata
- † Silberlingeria sarahjanae – type locality for species
† Siphonilda – type locality for genus
- † Siphonilda pulchella – type locality for species
† Sororcula
- † Sororcula gracilis
† Spiniomphalus – type locality for genus
- † Spiniomphalus duplicatus – type locality for species
† Spiriferina
- † Spiriferina roundyi
† Spirostylus
† Spondylospira
- † Spondylospira lewesensis
† Stacheites
- † Stacheites concavus
- † Stacheites floweri
- † Stacheites prionoides – or unidentified related form
† Stemmatoceras
- † Stemmatoceras albertense – or unidentified related form
Fossilized shell of the Middle Jurassic ammonoid cephalopod Stephanoceras
† Stephanoceras
- † Stephanoceras skidegatensis – or unidentified comparable form
† Stylophyllum
- † Stylophyllum paradoxum
† Subcolumbites
- † Subcolumbites perrinismithi – or unidentified related form
† Subhungarites
- † Subhungarites yatesi
† Submeekoceras
- † Submeekoceras mushbachanum – type locality for species
† Svalbardiceras
- † Svalbardiceras freboldi – or unidentified comparable form
- † Svalbardiceras spitzbergensis – or unidentified related form
- † Svalbardiceras sulcatum – type locality for species

T

† Tancredia – tentative report
† Tapponnierites – type locality for genus
- † Tapponnierites tenuicostatus – type locality for species
† Tardicolumbites – type locality for genus
- † Tardicolumbites tardicolumbus – type locality for species
† Teinostomopsis – tentative report
† Tempskya
- † Tempskya wesselii
Life restoration of the Early Cretaceous Iguanodon relative Tenontosaurus
† Tenontosaurus
† Teretrina
- † Teretrina aculeata
- † Teretrina canaliculata – type locality for species
- † Teretrina schulberti – type locality for species
† Thamnasteria
- † Thamnasteria smithi
† Thaumastocoelia
† Thecomeandra
- † Thecomeandra vallieri – type locality for species
† Tirolites
- † Tirolites harti
- † Tirolites knighti
- † Tirolites pealei
- † Tirolites smithi – type locality for species
† Tretospira
† Triadocidaris
Fossilized shell of the Permian-Paleocene marine bivalve Trigonia
† Trigonia
- † Trigonia montanaensis
† Tyrsoecus – tentative report

U

† Ueckerconulus
- † Ueckerconulus noricus – type locality for species
† Undularia
- † Undularia americana – type locality for species
† Unionites
† Ussuria
- † Ussuria occidentalis
† Ussurites
- † Ussurites mansfeldi
- † Ussurites mansfieldi
- † Ussurites submansfeldi – type locality for species

V

† Vex – type locality for genus
- † Vex semisimplex – type locality for species
† Vitimetula – type locality for genus
- † Vitimetula parva – type locality for species

W

† Weitschatopsis
- † Weitschatopsis pulchra
† Worthenia
- † Worthenia rhombifera – or unidentified comparable form
† Wyomingites – type locality for genus
- † Wyomingites aplanatus – type locality for species
- † Wyomingites arnoldi – type locality for species

X

† Xenoceltites
- † Xenoceltites cordilleranus
- † Xenoceltites crenulatus – type locality for species
- † Xenoceltites spencei
Fossilized shells of the ammonoid cephalopod Xenodiscus
† Xenodiscus
- † Xenodiscus gilberti
- † Xenodiscus tarpeyi
- † Xenodiscus waageni
- † Xenodiscus whiteanus

Y

† Yunnania – tentative report
- † Yunnania subcincta
† Yvesgalleticeras
- † Yvesgalleticeras montpelierense
- † Yvesgalleticeras raphaeli – type locality for species

Z

† Zardinechinus
† Zygopleura

References

1 2 3 4 Arnaud Brayard; James F. Jenks; Kevin G. Bylund; the Paris Biota Team (2019). "Ammonoids and nautiloids from the earliest Spathian Paris Biota and other early Spathian localities in southeastern Idaho, USA". Geobios. 54: 13–36. doi: 10.1016/j.geobios.2019.04.007 .
1 2 Lucas N. Weaver; Gregory P. Wilson; L. J. Krumenacker; Kayla Mclaughlin; Jason R. Moore; David J. Varricchio (2019). "New multituberculate mammals from the mid-Cretaceous (lower Cenomanian) Wayan Formation of southeastern Idaho and implications for the early evolution of Cimolodonta". Journal of Vertebrate Paleontology. 39 (2): e1604532. doi:10.1080/02724634.2019.1604532. S2CID 196655261.

Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database" . Retrieved 17 December 2021.

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[Caribouceras-1] 1 2 3 4 Arnaud Brayard; James F. Jenks; Kevin G. Bylund; the Paris Biota Team (2019). "Ammonoids and nautiloids from the earliest Spathian Paris Biota and other early Spathian localities in southeastern Idaho, USA". Geobios. 54: 13–36. doi: 10.1016/j.geobios.2019.04.007 .

[cimolodon-akersteni-2] 1 2 Lucas N. Weaver; Gregory P. Wilson; L. J. Krumenacker; Kayla Mclaughlin; Jason R. Moore; David J. Varricchio (2019). "New multituberculate mammals from the mid-Cretaceous (lower Cenomanian) Wayan Formation of southeastern Idaho and implications for the early evolution of Cimolodonta". Journal of Vertebrate Paleontology. 39 (2): e1604532. doi:10.1080/02724634.2019.1604532. S2CID 196655261.

[1]

[2]

List of the Mesozoic life of Idaho

Contents

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

References