# List of the Paleozoic life of Wyoming

This list of the Paleozoic life of Wyoming contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Wyoming and are between 538.8 and 252.17 million years of age.

## A

* 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
* †Acanthopecten
** †Acanthopecten alatus
** †Acanthopecten coloradoensis
** †Acanthopecten delawarensis – or unidentified comparable form
* †Acanthoscorpio – type locality for genus
** †Acanthoscorpio mucronatus – type locality for species
* †Acanthracospirifer
** †Acanthracospirifer occiduus – tentative report
** †Acanthracospirifer shawi
* †Acondylacanthus
** †Acondylacanthus browni – type locality for species
* †Acontiodus
* †Acratia – tentative report
** †Acratia disjuncta
* †Actinoceras
* †Actinocoelia
** †Actinocoelia maeandrina
* †Acuticarpus
** †Acuticarpus delticus
** †Acuticarpus republicensis – type locality for species
* †Adetognathodus
** †Adetognathodus gigantea – or unidentified comparable form
* †Agassizodus
** †Agassizodus variabilis
* †Agnostogonus
** †Agnostogonus incognitus – or unidentified comparable form
* †Allocryptaspis
** †Allocryptaspis ellipticus
** †Allocryptaspis flabelliformis
* †Allumettoceras
* †Alokistocare
* †Amphiscapha
** †Amphiscapha calix – type locality for species
* †Amphissites
** †Amphissites robertsi
* †Amplexus
* †Ananias
** †Ananias nevadensis – or unidentified related form
* †Anarthraspis
** †Anarthraspis chamberlini
** †Anarthraspis montanus
* †Ancistriodus
** †Ancistriodus multisectus
* †Anematina
* †Angulotreta
* †Anidanthus
* †Ankoura
* †Anthracospirifer
** †Anthracospirifer curvilateralis
** †Anthracospirifer occidus
** †Anthracospirifer occiduus
** †Anthracospirifer rawlinsensis
** †Anthracospirifer shawi
** †Anthracospirifer welleri
* †Antiquatonia
** †Antiquatonia coloradoensis – or unidentified comparable form
** †Antiquatonia sulcatus – or unidentified comparable form
* †Antracospirifer
** †Antracospirifer occidus
** †Antracospirifer rawlinsensis
** †Antracospirifer shawi
** †Antracospirifer welleri
* †Apachella
** †Apachella boydi – type locality for species
** †Apachella capertoni
** †Apachella franciscana
** †Apachella pseudostrigillata
** †Apachella turbiniformis
* †Aphanaia
** †Aphanaia erectum – type locality for species
* †Aphelaspis
** †Aphelaspis walcotti
* †Apiculatisporites
** †Apiculatisporites microconus
* †Apiculiretusispora
** †Apiculiretusispora plicata
** †Apiculiretusispora spicula
* †Arapahoia
* †Archaediscus
** †Archaediscus krestovnikovi – or unidentified loosely related form
* †Archaeocidaris
* †Arctacanthus
** †Arctacanthus wyomingensis – type locality for species
* †Asphaltina
* †Astartella
** †Astartella aueri – type locality for species
** †Astartella concentrica
* †Asteroarchaediscus
** †Asteroarchaediscus bachkiricus
* Life restoration of the Middle-Late Ordovician jawless fish Astraspis †Astraspis
** †Astraspis desiderata
* †Aviculopecten
** †Aviculopecten basilicus – or unidentified comparable form
** †Aviculopecten girtyi
** †Aviculopecten gravidus
** †Aviculopecten gryphus
** †Aviculopecten kaibabensis – or unidentified comparable form
* †Aviculopinna

## B

* 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
* †Babylonites
* Bairdia
** †Bairdia contracta
** †Bairdia delicata
** †Bairdia nasuta
* †Bakevellia – tentative report
* †Balantoides
** †Balantoides quadrilobatus
* †Baltagnostus
** †Baltagnostus wyomingensis – type locality for species
* †Barytichisma
** †Barytichisma amsdenense
* †Batacanthus
** †Batacanthus gigas – type locality for species
* †Bathymyonia
** †Bathymyonia nevadensis
* †Batostoma
* †Bayfieldia
** †Bayfieldia bindosa
** †Bayfieldia simata – or unidentified comparable form
* †Baylea
** †Baylea delawarensis
* Fossilized shell of the Silurian-Early Triassic mollusc Bellerophon †Bellerophon
** †Bellerophon deflectus – or unidentified comparable form
* †Belodus
* †Bighornia
** †Bighornia parva
** †Bighornia patella
* †Billingsella
** †Billingsella perfecta
* †Biseriella
** †Biseriella moderata
** †Biseriella parva
* †Blountia
** †Blountia cora
** †Blountia janei
* †Blountiella
** †Blountiella alberta
* †Bolaspidella
* †Borestus
* †Bowmania
** †Bowmania pennsylvania
* †Brachythyrina
** †Brachythyrina washakiensis
* †Bradyina – tentative report
* †Branchioscorpio – type locality for genus
** †Branchioscorpio richardsoni – type locality for species
* †Briscoia
* †Broeggeria – tentative report
** †Broeggeria strobiliformis
* †Broggeria – tentative report
** †Broggeria strobiliformis – type locality for species
* †Bryantodina
* †Bryantolepis
** †Bryantolepis brachycephalus
** †Bryantolepis cristatus
** †Bryantolepis major
** †Bryantolepis obscurus
* †Bucheria – type locality for genus
** †Bucheria ovata – type locality for species
* †Bulbocanthus
** †Bulbocanthus rugosus
* Restorative portrait of the Permian synapsid (mammal prescursor) Burnetia †Burnetia
** †Burnetia alta – or unidentified comparable form
* †Bynumia

## C

* 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
* †Calapoecia
** †Calapoecia coxi
* †Calcisphaera
** †Calcisphaera laevis
** †Calcisphaera pachysphaerica
* †Camaraspis
** †Camaraspis convexa
* Life restoration of the Carboniferous Chimaera relative †Campodus
* †Camptonectes – tentative report
* †Cancrinella
** †Cancrinella phosphatica
* †Caneyella
* †Caninia
** †Caninia nevadensis
* †Cardipeltis
** †Cardipeltis bryanti
** †Cardipeltis richardsoni
** †Cardipeltis wallacii
* †Carlinia
** †Carlinia amsdeniana
* †Cassianoides
** †Cassianoides sexcostatus – type locality for species
* Fossil of the Ordovician-Silurian tabulate coral Catenipora †Catenipora
** †Catenipora robusta
* †Cavellina
** †Cavellina bransoni
* †Cavusgnathus
** †Cavusgnathus unicornis
* †Cedaria
* †Cedarina
* †Celtoides – type locality for genus
** †Celtoides unioniformis – type locality for species
* Life restoration of the Early Devonian jawless fish Cephalaspis †Cephalaspis
** †Cephalaspis wyomingense
* †Ceraunocochlis
* †Chaetetes
** †Chaetetes eximius – or unidentified comparable form
** †Chaetetes wyomingensis
* †Charactoceras – tentative report
* †Cheilocephalus
** †Cheilocephalus delandi
* †Chirognathus
** †Chirognathus alternata
** †Chirognathus curvidens
** †Chirognathus delicatulus
** †Chirognathus monodactyla
** †Chirognathus multidens
** †Chirognathus reversa
** †Chirognathus tenuidentatus
** †Chirognathus unguliformis
* †Chonetes
* †Cibecuia
** †Cibecuia gouldii – or unidentified comparable form
* †Cinclidonema
** †Cinclidonema clausepeakensis – type locality for species
* Fossilized shell of the Middle Devonian-Permian brachiopod Cleiothyridina †Cleiothyridina
** †Cleiothyridina atrypoides
** †Cleiothyridina elegans – or unidentified related form
** †Cleiothyridina hirsuta
** †Cleiothyridina sublamellosa – or unidentified related form
* †Clelandia
** †Clelandia typicalis
* †Cliffa
** †Cliffa lataegenae
* †Cliffia
** †Cliffia lataegenae
* †Climacammina
* †Coelogasteroceras
** †Coelogasteroceras mexicanum
** †Coelogasteroceras thomasi – type locality for species
* †Coleodus
** †Coleodus simplex
* †Colpites
* Fossilized shell of the Late Devonian-Permian brachiopod Composita †Composita
** †Composita elongata
** †Composita laevis – or unidentified related form
** †Composita mira
** †Composita ovata
** †Composita poposiensis
** †Composita sigma
** †Composita subquadrata
** †Composita subtilita
** †Composita sulcata
* †Conocardium
* †Coosella
* †Coosia
** †Coosia alethes
* †Coosina
** †Coosina ariston
* †Cordylodus
** †Cordylodus concinnus – tentative report
* Cornuspira
* †Crassidonta
** †Crassidonta stuckenbergi
* †Crepicephalus
** †Crepicephalus auratus
** †Crepicephalus buttsimontanaensis
** †Crepicephalus rectus
* †Crurithyris
** †Crurithyris arcuata
** †Crurithyris arcuatus
* Fossil of the Carboniferous shark Ctenacanthus †Ctenacanthus
** †Ctenacanthus amblyxiphias
** †Ctenacanthus mutabilis – type locality for species
** †Ctenacanthus obscuracostatus – type locality for species
* †Ctenalosia
** †Ctenalosia transversa – type locality for species
* †Cuffeyella
** †Cuffeyella arachnoidea
* †Cupulocrinus
** †Cupulocrinus latibrachiatus – or unidentified comparable form
* †Cyclites
** †Cyclites depressus – or unidentified comparable form
* †Cyclospira – tentative report
** †Cyclospira anticostiana
* †Cymbosporites
** †Cymbosporites proteus
** †Cymbosporites senex
* †Cypricardella – tentative report
* †Cyrtogomphoceras
* †Cyrtoniodus
** †Cyrtoniodus complicatus
** †Cyrtoniodus erectus
* †Cyrtorostra
** †Cyrtorostra varicostata – type locality for species
* Cytherella – report made of unidentified related form or using admittedly obsolete nomenclature
** †Cytherella benniei
* †Cytogomphoceras

## D

* 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
* †Deckera
** †Deckera completa – or unidentified comparable form
* †Delaria
** †Delaria sevilloidia – type locality for species
* †Della
** †Della suada
* †Deltodus
** †Deltodus mercurei
* †Dendrocrinus
* †Densonella
* Shell of a Dentalium tusk shell †Dentalium
* †Derbyia
** †Derbyia magna
** †Derbyia robusta – or unidentified comparable form
* †Diaphragmus
** †Diaphragmus nivosus
* †Dibolisporites
** †Dibolisporites abitibiensis
** †Dibolisporites eifeliensis
** †Dibolisporites wetteldorfensis
* †Dicellomus
** †Dicellomus amblia
* †Diceromyonia
** †Diceromyonia storeya
* †Dictyonina
* †Dictyotomaria
** †Dictyotomaria carlbransoni – type locality for species
* †Dielasma
** †Dielasma fabiforme – type locality for species
* †Diestoceras
* †Dimorphosiphon
** †Dimorphosiphon talbotorum
* †Dinorthis
** †Dinorthis occidentalis
* †Diplosphaerina
* †Distichophytum
** †Distichophytum ovatum
* †Dokimocephalus
* †Donaldina
** †Donaldina pygmaea – or unidentified related form
* †Donaldospira
** †Donaldospira geminocarinata
* †Drepanodos
* Fossilized foliage from the Early-Late Devonian club moss relative Drepanophycus †Drepanophycus
** †Drepanophycus devonicus
* †Duncanopora
** †Duncanopora duncanae
* †Dysoristus
** †Dysoristus lochmanae

## E

* 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
* †Earlandia
** †Earlandia clavatula
** †Earlandia elegans
* †Echinauris
** †Echinauris magna
* †Echinoconchus
* †Ectenocrinus
* †Ectodemites
** †Ectodemites warei
* †Edmondia
** †Edmondia gibbosa
** †Edmondia phosphatica
** †Edmondia phosphoriensis – or unidentified comparable form
** †Edmondia stuchburia
* †Eirlysia
** †Eirlysia reticulata – or unidentified comparable form
* †Elvinia
** †Elvinia roemeri
* †Emphanisporites
** †Emphanisporites micrornatus
** †Emphanisporites rotatus
* Fossilized shells and restored appearances of the Middle-Late Ordovician nautiloid cephalopod Endoceras †Endoceras
* †Endothyra
** †Endothyra bowmani – or unidentified loosely related form
** †Endothyra excellens
** †Endothyra prisca – or unidentified loosely related form
** †Endothyra similis – or unidentified loosely related form
* †Endothyranella
* †Eoastarte – type locality for genus
** †Eoastarte subcircularis – type locality for species
* †Eocamptonectes
** †Eocamptonectes sculptilis
* †Eochonetes
** †Eochonetes maearum – type locality for species
* †Eoorthis
** †Eoorthis remnicha
* †Eoschubertella
* †Eostaffella
** †Eostaffella acutissima – or unidentified loosely related form
** †Eostaffella circuli
** †Eostaffella pseudostruvei – or unidentified loosely related form
* †Eostaffellina
** †Eostaffellina paraprotvae
* †Eotuberitina
* †Ephippiorthoceras
* †Eriptychius
** †Eriptychius americanus
* †Erismodus
** †Erismodus abbreviatus
** †Erismodus typus
* †Eumetria
** †Eumetria sulcata
* †Eunemacanthus
** †Eunemacanthus keytei
* Fossilized shell of the Silurian-Permian sea snail Euomphalus †Euomphalus
** †Euomphalus plummeri – or unidentified related form
* †Euphemites
** †Euphemites crenulatus
** †Euphemites fremontensis – type locality for species
** †Euphemites luxuriosus
** †Euphemites sacajawensis
** †Euphemites sparciliratus
* †Euphemitopsis
** †Euphemitopsis multinodosa
** †Euphemitopsis subpapillosa
* †Eurekia

## F

* 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
* Fossil of the Late Ordovician-Permian tabulate coral Favosites †Favosites
** †Favosites prolificus – or unidentified comparable form
* †Flexaria – tentative report
* †Foerstephyllum
* †Fransonia
** †Fransonia wyomingensis

## G

* 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
* †Gallatinospongia – type locality for genus
** †Gallatinospongia conica – type locality for species
* †Gastrioceras – report made of unidentified related form or using admittedly obsolete nomenclature
** †Gastrioceras williamsi – type locality for species
* †Genevievella
* Fossil of the Early-Late Ordovician trilobite Geragnostus †Geragnostus
** †Geragnostus insoltus
* †Girtyella
** †Girtyella indianensis – or unidentified comparable form
* †Girtypecten
** †Girtypecten sublaqueatus
* †Girtyspira
* †Girvanella
* †Glabrocingulum
** †Glabrocingulum alveozonum
** †Glabrocingulum coronatum
** †Glabrocingulum texanum
* †Glaphyraspis
** †Glaphyraspis occidentalis
* Life restoration of the Carboniferous shark Glikmanius †Glikmanius
** †Glikmanius occidentalis
* †Globivalvulina
** †Globivalvulina bulloides – or unidentified loosely related form
* †Globoendothyra
* †Glyphaspis
** †Glyphaspis tetonensis
* †Glyptopleura
** †Glyptopleura multicostata
* †Gnamptorhynchos
** †Gnamptorhynchos prayi
* †Goniasma – tentative report
* Fossilized shell of the Late Devonian-Late Triassic ammonoid cephalopod Goniatites †Goniatites – tentative report
* †Goniophora – tentative report
* †Gosseletina
** †Gosseletina idahoensis – type locality for species
** †Gosseletina permiana
* †Gosslingia
** †Gosslingia americana
* †Grandispora
** †Grandispora biornata – tentative report
** †Grandispora douglastownense
** †Grandispora macrotuberculata – tentative report
** †Grandispora micronata
* †Guizhoupecten
** †Guizhoupecten cheni
** †Guizhoupecten tubicostata – type locality for species

## H

* 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
* †Hadragnostus
** †Hadragnostus modestus
* †Hamatus
** †Hamatus phosphoriensis
* †Healdia
** †Healdia ornata
* †Helemacanthus
** †Helemacanthus incurvus
* †Helicelasma
** †Helicelasma selectum
* Life restoration of the Permian Chimaera relative Helicoprion †Helicoprion
** †Helicoprion davisii
* †Helodus
** †Helodus rugosus
** †Helodus subpolitus – type locality for species
* †Heslerodus
** †Heslerodus divergens
* †Hesperorthis
** †Hesperorthis pyramidalis – or unidentified comparable form
* †Heteropecten
** †Heteropecten vanvleeti – or unidentified comparable form
* †Hibbardella
* †Hiscobeccus
** †Hiscobeccus gigas
* †Holcacephalus
** †Holcacephalus tenerus
* †Hollina
** †Hollina occidentalis
* †Hollinella
** †Hollinella typica
* †Holophragma – report made of unidentified related form or using admittedly obsolete nomenclature
* †Homagnostus
* †Hormotoma
* †Hostimella
* †Housia
* †Hustedia
** †Hustedia phosphoriensis
* †Hydroscorpius – type locality for genus
** †Hydroscorpius denisoni – type locality for species
* Fossilized shells of the Cambrian-Permian brachiopod relative Hyolitha †Hyolithes
** †Hyolithes primordialis
* †Hypergonia
** †Hypergonia percostata
* †Hypseloconus
** †Hypseloconus simplex
* †Hypsiptycha
** †Hypsiptycha anticostiense
** †Hypsiptycha anticostiensis
** †Hypsiptycha neenah – or unidentified comparable form
* †Hystriculina

## I

* 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
* †Ianthinopsis
* †Idiognathoides
** †Idiognathoides corrugata
** †Idiognathoides sinuata
* †Illaenurus
** †Illaenurus priscus
* †Incrustatospongia – type locality for genus
** †Incrustatospongia superficiala – type locality for species
* †Inflatia
** †Inflatia lovei
* †Ithyektyphus
** †Ithyektyphus tetonensis

## J

* 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
* Restoration of the Carboniferous-Permian ray-like cartilaginous fish Janassa (top and left) †Janassa
** †Janassa angularis
** †Janassa unguicula
** †Janassa unguiformis
* †Jonesina
** †Jonesina carbonifera
* †Josina – type locality for genus
** †Josina festiva – type locality for species
* †Juresania

## K

* 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
* †Kaibabella
** †Kaibabella basilica – type locality for species
* Fossil of the Cambrian trilobite Kendallina †Kendallina
** †Kendallina eryon
* †Kingstonia
** †Kingstonia walcotti
* †Kionoceras
* †Kochoceras
* †Komiella
** †Komiella ostiolata
* †Kormagnostus
** †Kormagnostus seclusus
* †Kyphocephalus

## L

* 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
* †Lambeoceras
* †Lamellospira
** †Lamellospira alveozona – type locality for species
* †Lampraspis
** †Lampraspis tuberculata
* Fossils of the Middle Devonian clubmoss Leclercqia †Leclercqia
** †Leclercqia complexa
* †Leiorhynchus
** †Leiorhynchus weeksi
* †Lepidocyclus
* †Leptochondria
** †Leptochondria curtocardinalis – type locality for species
* †Leptodesma
* †Levizygopleura
** †Levizygopleura inornata – or unidentified comparable form
* †Limipecten – tentative report
* †Linglella
** †Linglella modesta
* †Lingula
** †Lingula carbonaria
* Illustration of a fossilized shell of the Cambrian-Late Ordovician brachiopod Lingulella †Lingulella
** †Lingulella modesta
* †Linnarssonella
** †Linnarssonella girtyi
** †Linnarssonella girtyyi
* †Linoproductus
** †Linoproductus eastoni
** †Linoproductus planiventralis
* †Liosotella – tentative report
* †Lipinella
* †Liroceras
* †Lobocorallium
** †Lobocorallium trilobatum
* †Lonchocephalus
* †Lonchodus
* †Lyroschizodus
** †Lyroschizodus oklahomensis – or unidentified comparable form

## M

* 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
* †Machaeracanthus
** †Machaeracanthus minor
* †Maclurina
** †Maclurina manitobensis
* †Maclurites
* †Macrostylocrinus
** †Macrostylocrinus wyomingensis – type locality for species
* †Marginifera
** †Marginifera haydenensis
* †Maryvillia
* †Meekella
** †Meekella attenuata
* †Meekopinna
** †Meekopinna sagitta
* †Meekospira
* †Megamyonia
** †Megamyonia nitens
* †Meniscocoryphe
** †Meniscocoryphe platycephala
* †Meniscocryphe
** †Meniscocryphe platycephala
* †Mesolobus
* Fossilized shell of the Carboniferous-Permian nautiloid cephalopod Metacoceras †Metacoceras
** †Metacoceras knighti – type locality for species
** †Metacoceras sulciferum – type locality for species
* †Meteoraspis
* †Microcoelodus
** †Microcoelodus breviconus
** †Microcoelodus unicornis
* †Microdoma – tentative report
* †Micromitra
** †Micromitra modesta
* †Millerella
** †Millerella pressa
** †Millerella pura – or unidentified related form
* †Miltonella
** †Miltonella shupei
* †Minicephalus – type locality for genus
** †Minicephalus primus – type locality for species
* †Modocia
* †Monocheilus
** †Monocheilus truncatus
* †Mooreoceras – tentative report
* †Mourlonia
* †Multithecopora
** †Multithecopora amsdenensis
* †Myalina
** †Myalina aviculoides
** †Myalina sinuata – type locality for species
** †Myalina wyomingensis

## N

* 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
* †Nahannagnostus
** †Nahannagnostus nganasanicus
* †Nasutimena
** †Nasutimena fluctuosa
* Fossilized shell of the Early Devonian – Triassic sea snail Naticopsis †Naticopsis
** †Naticopsis judithae
** †Naticopsis kaibabensis
** †Naticopsis marthaae – or unidentified comparable form
* †Natiria
** †Natiria americana
* †Neoarchaediscus
** †Neoarchaediscus incertus
** †Neoarchaediscus parvus
* †Neocoleodus
** †Neocoleodus spicatus
* †Neokoninckophylllum
** †Neokoninckophylllum inconstans
* †Neokoninckophyllum
** †Neokoninckophyllum hamatilis
* Fossilized shell of the Carboniferous-Permian brachiopod Neospirifer †Neospirifer
** †Neospirifer bakeri
* †Nixonella
* Nucula – tentative report
* †Nuculopsis
** †Nuculopsis montpelierensis
** †Nuculopsis poposiensis – type locality for species
** †Nuculopsis pulchra
* †Nuferella – tentative report
** †Nuferella puncta

## O

* 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
* †Obliquipecten
* †Ocnerorthis
** †Ocnerorthis cooperi
* †Oepikina
** †Oepikina pergibbosa – or unidentified comparable form
* †Oistodus
** †Oistodus curvatus
* Fossil of the Cambrian trilobite Olenoides †Olenoides
** †Olenoides incertus – or unidentified comparable form
* †Onchus
** †Onchus penetrans
** †Onchus peracutus
* †Orbiculoidea
** †Orbiculoidea missouriensis
** †Orbiculoidea utahensis
** †Orbiculoidea wyomingensis
* †Oreaspis
** †Oreaspis ampla
** †Oreaspis dunklei
** †Oreaspis williamsi
* †Oriocrassatella
** †Oriocrassatella elongata – type locality for species
* †Orthonema
* †Orthotetes
** †Orthotetes kaskaskiensis
* †Orthothetina
** †Orthothetina amsdenensis
* †Otusia
* †Ovatia
** †Ovatia croneisi
** †Ovatia muralis
* †Ozarkodina

## P

* 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
* †Paladin
** †Paladin moorei
* †Palaeoneilo
** †Palaeoneilo mcchesneyana
* †Palaeonubecularia – or unidentified comparable form
* †Palaeophyllum
** †Palaeophyllum gracile
** †Palaeophyllum humei
* †Palaeotextularia
** †Palaeotextularia consobrina – or unidentified loosely related form
** †Palaeotextularia longiseptata – or unidentified loosely related form
* †Paleocuticularia – type locality for genus
** †Paleocuticularia perforata – type locality for species
* †Paleofavosites
** †Paleofavosites prayi
* †Paleyoldia
** †Paleyoldia amsdenensis
* †Paltodus
* †Parabolinoides
** †Parabolinoides expansus
* †Paracedaria
* †Paracedarina
* †Paractinoceras
* †Parajuresania
** †Parajuresania nebrascensis
* †Parallelodon
** †Parallelodon multistriatus – or unidentified comparable form
* †Paraschizodus – type locality for genus
** †Paraschizodus elongatus – type locality for species
* †Paraspiriferina
** †Paraspiriferina formulosa – type locality for species
* †Parehmania
** †Parehmania inornata
* †Peripetoceras
* †Permophorus
** †Permophorus albequus
** †Permophorus pricei – type locality for species
* †Pernopecten
* †Petrocrania
* †Pharkidonotus
** †Pharkidonotus altitropis – type locality for species
* †Phestia
** †Phestia perumbonata
* †Pimmacanthus
** †Pimmacanthus inequistriatus
* †Plaesiomys
** †Plaesiomys rockymontana – or unidentified related form
* †Plagioglypta
* †Planoendothyra
* †Planospirodiscus
* †Platyceras
** †Platyceras yochelsoni – type locality for species
* Fossilized shell of the Middle Ordovician-Silurian brachiopod Platystrophia †Platystrophia
** †Platystrophia equiconvexa
* †Plethopletis
** †Plethopletis arbucklensis
* †Pleurosiphonella
** †Pleurosiphonella drummondi
* †Polidevcia
** †Polidevcia bellistriata
** †Polidevcia obesa
* †Polycaulodus
** †Polycaulodus bidentatus
* †Posidonia
* †Praearcturus
* †Proagnostus – or unidentified comparable form
* †Procostatoria
** †Procostatoria sexradiata
* †Prodentalium
** †Prodentalium canna
* †Protaspis
** †Protaspis brevispina
** †Protaspis mcgrewi
** †Protaspis ovata
** †Protaspis sculpta
** †Protaspis transversa
* †Prototreta
* †Pseudagnostus
** †Pseudagnostus douvillei
** †Pseudagnostus prolongus – or unidentified comparable form
* †Pseudobythocypris – tentative report
** †Pseudobythocypris amsdenensis
* †Pseudoendothyra
** †Pseudoendothyra kremenskensis – or unidentified loosely related form
* †Pseudogastrioceras
* †Pseudoglomospira
* †Pseudomatthevia
** †Pseudomatthevia conica
* Fossilized shell of a Pseudomelania sea snail †Pseudomelania – tentative report
* †Pseudomonotis
** †Pseudomonotis likharevi
* †Pseudorthoceras
** †Pseudorthoceras knoxense
* †Pseudovidrioceras
** †Pseudovidrioceras girtyi
* †Pseudozygopleura
** †Pseudozygopleura croneisi
** †Pseudozygopleura girtyi – or unidentified comparable form
* †Psilophyton
** †Psilophyton wyomingense – type locality for species
* †Pterocephalia
** †Pterocephalia bridgei
* †Pteroconus
** †Pteroconus gracilis
* †Pugnoides
** †Pugnoides quinqeuplecis
** †Pugnoides quinqueplecis
* †Pulsia
** †Pulsia delira

## R

* 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
* †Rawlinsella
* †Renalcis
* Restoration of the Early Devonian primitive vascular plant Renalia †Renalia
** †Renalia dorfii – type locality for species
* †Reticulariina
** †Reticulariina browni
* †Reticulatia
** †Reticulatia americana
* †Retispira
** †Retispira fragilis
** †Retispira modesta
** †Retispira tenuilineata – or unidentified loosely related form
** †Retispira textiliformis
* †Retusotriletes
** †Retusotriletes actinomorphus
** †Retusotriletes dubiosus
** †Retusotriletes simplex
** †Retusotriletes warringtonii
* †Rhynchotrema
** †Rhynchotrema iowense
* †Rhynoleichus
** †Rhynoleichus weeksi
* †Rugomena
** †Rugomena planocorrugata

## S

* 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
* †Sallya
** †Sallya linsa
* †Sanguinolites
* †Sansabella
** †Sansabella reversa
* †Sargentina – tentative report
** †Sargentina amsdenensis
* Fossil of the Cambrian-Ordovician trilobite Saukiella †Saukiella
** †Saukiella pyrene
* †Sawdonia
** †Sawdonia wyomingense – type locality for species
* †Scapallina
** †Scapallina phosphoriensis
* †Scaphellina
** †Scaphellina concinna – type locality for species
* †Sceptropora
** †Sceptropora facula – or unidentified comparable form
* †Schizodus
** †Schizodus affinis – or unidentified related form
** †Schizodus alpinus
** †Schizodus altus – type locality for species
** †Schizodus bifidus
** †Schizodus canalis
** †Schizodus depressus – or unidentified comparable form
** †Schizodus ferrieri
** †Schizodus subovatus
** †Schizodus wheeleri – or unidentified comparable form
** †Schizodus wyomingensis – type locality for species
* †Schizophoria
** †Schizophoria depressa
** †Schizophoria texana – or unidentified comparable form
* †Schuchertella
** †Schuchertella poposiensis – or unidentified comparable form
* †Scoloconcha
** †Scoloconcha globosa
* †Sedgewickia – tentative report
* †Semicircularea
** †Semicircularea arcuata
* †Shansiella
* †Shedhornia – type locality for genus
** †Shedhornia ornata – type locality for species
* †Shishaella
** †Shishaella moreyi
* Modern specimen of the marine bivalve Solemya Solemya
* †Soleniscus
** †Soleniscus altonensis – or unidentified related form
** †Soleniscus primogenius
** †Soleniscus typicus
* †Solenochilus
** †Solenochilus brammeri – or unidentified comparable form
* †Sphenalosia – type locality for genus
** †Sphenalosia smedleyi – type locality for species
* †Sphenosteges
** †Sphenosteges hispidus
* †Sphondylophyton
** †Sphondylophyton hyenioides
* Fossilized shell and lophophore of the Silurian-Middle Jurassic brachiopod Spiriferina †Spiriferina
** †Spiriferina kentuckensis – or unidentified comparable form
* †Spyroceras
* †Stacheia
* †Stacheoides
* †Stearoceras
** †Stearoceras phosphoriense
* †Stegocoelia
* †Stenolobulites
** †Stenolobulites simulator
* †Stenopilus
** †Stenopilus glaber
* †Stenopoceras
** †Stenopoceras abundum – type locality for species
* †Steroconus
** †Steroconus gracilis
** †Steroconus plenus
** †Steroconus robustus
* †Straparollus
* †Streblopteria
** †Streblopteria montpelierensis
* †Streplopteria
* †Streptelasma
** †Streptelasma trilobatum
* †Streptognathodus
** †Streptognathodus parvus
* †Streptognathus
* †Strobeus
** †Strobeus intercalaris – or unidentified comparable form
** †Strobeus paludinaeformis – or unidentified comparable form
* Fossilized shell of the Ordovician-Silurian brachiopod Strophomena †Strophomena
* †Strophostylus
* †Stutchburia
* †Syspacheilus

## T

* 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
* †Taenicephalus
** †Taenicephalus shumardi
* †Tainoceras
** †Tainoceras wyomingense – type locality for species
* †Talbotina
* †Tapinotomaria – tentative report
* †Tatonkacystis – type locality for genus
** †Tatonkacystis codyensis – type locality for species
* †Tetrataxis
* †Timaniella
** †Timaniella pseudocamerata
* †Torynifer
** †Torynifer setiger
* †Trachelocrinus
** †Trachelocrinus resseri
* †Tracheolcrinas – tentative report
* †Trachydomia – tentative report
* †Trepeilopsis
* †Triarthropsis
** †Triarthropsis nitida – or unidentified comparable form
* Fossil of the Cambrian trilobite Tricrepicephalus †Tricrepicephalus
** †Tricrepicephalus coria
* †Triticites
** †Triticites ventricosus
* †Tuberitina
* †Turbinatocanina
* †Turbinatocaninia – tentative report

## U

* 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
* †Uncaspis
** †Uncaspis limbata
* Fossilized jaws of the Late Devonian lungfish Uranolophus †Uranolophus
** †Uranolophus wyomingense

## 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
* †Virgaspongiella – type locality for genus
** †Virgaspongiella ramosa – type locality for species
* †Vnigripecten
** †Vnigripecten phosphaticus – type locality for species
* †Volvotextularia

## 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
* †Waagenella
** †Waagenella crassus – or unidentified comparable form
* †Warthia
** †Warthia fissus
** †Warthia waageni – or unidentified comparable form
* †Wellerella
** †Wellerella osagensis – or unidentified comparable form
* †Westonoceras
* †Whitfieldoceras
* †Wilkingia
** †Wilkingia terminalis
** †Wilkingia wyomingensis – type locality for species
* †Wilsonoceras
* †Winnipegoceras
* †Worthenia
** †Worthenia corrugata

## 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
* †Xestotrema
** †Xestotrema pulchrum

## 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
* †Yakovlevia
** †Yakovlevia multistriatus
* †Yochelsonellisa
** †Yochelsonellisa eximia
* †Yunnania – tentative report

## 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
* †Zaphrentites – tentative report
* †Zellerina
** †Zellerina discoidea
* †Zygospira
** †Zygospira aequivalvis