# List of the Mesozoic life of Idaho

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

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* †Albanites
** †Albanites americanus – type locality for species
** †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

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* †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

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* †Camptonectes
** †Camptonectes platessiformis
* †Caribouceras – type locality for genus
** †Caribouceras slugense – type locality for species
* †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
** †Cimolodon akersteni – type locality for species
* †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

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* †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

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* †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

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* †Fengshanites
** †Fengshanites americanus
* †Flemingites
** †Flemingites aspenensis
** †Flemingites bannockensis
** †Flemingites cirratus

## G

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* †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

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* 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

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* †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

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* †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

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

## L

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* †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

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* †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

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* †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

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* †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

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* 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

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* †Quenstedtia
** †Quenstedtia sublevis

## R

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* †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

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* 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

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* †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

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* †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

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

## W

* 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
* †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

* 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
* †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

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

## Z

* 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
* †Zardinechinus
* †Zygopleura