List of the Paleozoic life of Montana

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

A

†Acanthocrania
- †Acanthocrania spinosa – type locality for species
†Acanthograptus
†Acanthopecten
- †Acanthopecten coloradoensis
†Achistrum
- †Achistrum coloculum
- †Achistrum gamma
- †Achistrum monochordata
†Acrothele
- †Acrothele colleni – type locality for species
- †Acrothele pentagonensis
†Acrotreta
- †Acrotreta attica – or unidentified comparable form
†Actinopteria
- †Actinopteria subdecussata – or unidentified comparable form
†Adetognathus
- †Adetognathus gigantus
- †Adetognathus lautus
- †Adetognathus spathus
†Aenigmacaris – type locality for genus
- †Aenigmacaris cornigerum – type locality for species

†Aesopichthys – type locality for genus
- †Aesopichthys erinaceus – type locality for species
†Albertella – type locality for genus
- †Albertella hellena – type locality for species
†Allanaria
Fossilized skeleton of the Carboniferous lobe-finned fish Allenypterus
†Allenypterus – type locality for genus
- †Allenypterus montanus – type locality for species
†Allorisma
†Ambocoelia
- †Ambocoelia gregaria
†Ambothyris
†Ameura – tentative report
Ammodiscus
†Amphiscapha
†Amplexizaphrentis
- †Amplexizaphrentis spinulosus – or unidentified comparable form
†Amplexus
†Angulotreta
†Angyomphalus – tentative report
- †Angyomphalus excavatus – type locality for species
†Anisotrypa
†Ankhelasma
†Annuliconcha
†Anoria
†Anthracospirifer
- †Anthracospirifer curvilateralis – type locality for species
- †Anthracospirifer occidus
- †Anthracospirifer shoshonensis
- †Anthracospirifer welleri
†Antiquatonia
- †Antiquatonia coloradoensis
- †Antiquatonia pernodosa – type locality for species
†Apatokephalus
- †Apatokephalus canadensis – or unidentified comparable form
†Aphelaeceras
†Aphelaspis
†Apheoorthis
- †Apheoorthis ocha
†Aporthophyla
†Apotocardium
- †Apotocardium latifasciatum
†Arceodomus
- †Arceodomus glabrata – type locality for species
†Archisymplectes
- †Archisymplectes rhothon
†Arctospirifer
- †Arctospirifer allegheniensis – or unidentified comparable form
†Asaphellus
†Astartella
†Astreptoscolex
- †Astreptoscolex anasillosus
†Athyris
†Atrypa
†Aulacoparia
- †Aulacoparia impressa – type locality for species
- †Aulacoparia wibauxensis
†Aulopora
Mold fossil of a shell of the Early Devonian-Late Triassic bivalve Aviculopecten
†Aviculopecten
- †Aviculopecten kaibabensis – or unidentified comparable form
†Aviculopinna
†Avonia
- †Avonia arcuata – tentative report
†Axiodeaneia

B

†Babylonites
†Bactrites
- †Bactrites nitidus
Bairdia
†Barytichisma
- †Barytichisma amsdenense
†Basilicorhynchus
- †Basilicorhynchus ventricosum
†Bathyuriscus
- †Bathyuriscus formosus – or unidentified comparable form
†Beagiascus – type locality for genus
- †Beagiascus pulcherrimus – type locality for species
†Beecheria
- †Beecheria paraplicata – type locality for species
Restoration of the Carboniferous Chimaera relative Belantsea
†Belantsea – type locality for genus
- †Belantsea montana – type locality for species
†Bellefontia
†Bellerophon
- †Bellerophon deflectus
†Bifungites
- †Bifungites bisagitta
†Billingsella
†Blountia
†Bolaspis
†Brachythyris
†Bradyphyllum
- †Bradyphyllum clavigerum – type locality for species
†Bryantodus
- †Bryantodus crassidens
- †Bryantodus scitulus
†Bryograptus
†Bucanella
†Bulimorpha
- †Bulimorpha elegans
†Burnetiella
†Buxtonia
- †Buxtonia arizonensis
†Bynumiella – tentative report
†Bynumina

C

†Cactocrinus – tentative report
†Caenanoplia – tentative report
- †Caenanoplia logani – or unidentified related form
†Callograptus
†Camaraspis
†Camarophorella
- †Camarophorella buckleyi – or unidentified comparable form
†Camarotoechia
- †Camarotoechia C. chouteauensis – or unidentified comparable form
- †Camarotoechia C. inaequa Shaw – or unidentified comparable form
- †Camarotoechia contracta
- †Camarotoechia crenistria
- †Camarotoechia elegantula
- †Camarotoechia herrickana – or unidentified related form
- †Camarotoechia metallica
- †Camarotoechia mettalica – or unidentified comparable form
- †Camarotoechia mutata
- †Camarotoechia tuta
†Canadiphyllum
†Caninia
- †Caninia montanensis – type locality for species
†Carbosesostris – type locality for genus
- †Carbosesostris megaliphagon – type locality for species
Fossilized skeleton of the Carboniferous coelacanth Caridosuctor
†Caridosuctor – type locality for genus
- †Caridosuctor populosum – type locality for species
†Carinoclymenia
†Cavusgnathus
- †Cavusgnathus alta
- †Cavusgnathus naviculus
†Ceratopea
- †Ceratopea sinclairensis
†Ceratreta
†Cheilocephalus
- †Cheilocephalus brevilobus
†Cheiloceras
- †Cheiloceras simplex
†Chilotrypa – tentative report
†Chonetes
- †Chonetes geniculatus
- †Chonetes loganensis
- †Chonetes logani
- †Chonetes ornatus
Fossilized tooth of the shark Cladodus
†Cladodus
†Clavallus
- †Clavallus spicaudina
†Cleiothyridina
- †Cleiothyridina atrypoides
- †Cleiothyridina ciriacksi – type locality for species
- †Cleiothyridina coloradoensis – or unidentified comparable form
- †Cleiothyridina devonica
- †Cleiothyridina hirsuta
- †Cleiothyridina incrassata – or unidentified related form
- †Cleiothyridina sublamellosa
†Cleiothyridnia
- †Cleiothyridnia sublamellosa
†Cleistopora
- †Cleistopora placenta
†Clelandia
†Cliffia
†Clionolithes
†Clonograptus
Fossilized shell of the Late Devonian-Permian brachiopod Composita
†Composita
- †Composita humilis
- †Composita laevis
- †Composita lateralis – or unidentified comparable form
- †Composita madisonensis
- †Composita ovata
- †Composita ozarkana
- †Composita sulcata
†Conularia
Fossil of the Middle Ordovician-Carboniferous horn coral Cornulites
†Cornulites
- †Cornulites carbonarius
†Costatoblastus – type locality for genus
- †Costatoblastus sappingtonensis – type locality for species
†Cranaena – tentative report
- †Cranaena circularis – type locality for species
†Crania
- †Crania blairi – or unidentified comparable form
- †Crania rowleyi
†Croixana
†Crurithyris
- †Crurithyris minuta
- †Crurithyris parva – or unidentified comparable form
†Cryptonella – tentative report
- †Cryptonella pinyonensis – or unidentified comparable form
†Crytina
- †Crytina acutirostris
†Culmicrinus
- †Culmicrinus jeffersonensis – or unidentified comparable form
†Cupularostrum
- †Cupularostrum contracta
†Cyathaxonia
†Cypricardella
†Cyranorhis – type locality for genus
- †Cyranorhis bergeraci – type locality for species
†Cyrtina
- †Cyrtina acutirostris – or unidentified comparable form
†Cyrtiopsis – tentative report
†Cyrtodiscus
†Cyrtorostra
- †Cyrtorostra varicostata
Fossilized shells of the Middle-Late Devonian brachiopod Cyrtospirifer
†Cyrtospirifer
- †Cyrtospirifer animaensis
- †Cyrtospirifer animasensis – or unidentified comparable form
- †Cyrtospirifer bertrandi – type locality for species
- †Cyrtospirifer gallatinensis
- †Cyrtospirifer hornellensis
- †Cyrtospirifer monticola
- †Cyrtospirifer perryi – type locality for species
- †Cyrtospirifer thalattodoxa – tentative report
- †Cyrtospirifer whitneyi
†Cystodictya

D

†Damocles – type locality for genus
- †Damocles serratus – type locality for species
†Deadwoodia
†Debeerius – type locality for genus
- †Debeerius ellefseni – type locality for species
†Dellea
Life restoration of the Carboniferous Chimaera relative Delphyodontos
†Delphyodontos – type locality for genus
- †Delphyodontos dacriformes – type locality for species
†Delthyris – tentative report
†Dendrograptus
†Dentinella
†Derbyia
†Deuteronectanebos – type locality for genus
- †Deuteronectanebos papillorum – type locality for species
†Diaphelasma
†Diaphragmus
- †Diaphragmus fasciculatus
†Dicellomus
- †Dicellomus occidentalis
†Dictyclostus
- †Dictyclostus richardsi
†Dictyoclostus
- †Dictyoclostus ferglenensis – or unidentified comparable form
- †Dictyoclostus gallatinensis
- †Dictyoclostus inflatus
- †Dictyoclostus richardsi
†Dictyoclosyus
- †Dictyoclosyus inflatus
†Dictyonema
†Dielasma
Illustration of the fossilized pygidium (tail segment) of the Cambrian trilobite Dikelocephalus
†Dikelocephalus
†Dimegelasma
†Dinotocrinus
†Discoserra – type locality for genus
- †Discoserra pectinodon – type locality for species

†Distomodus
†Dithyrocaris
- †Dithyrocaris rolfei – type locality for species

†Ditodus
†Drepanodus
- †Drepanodus subarcuatus
†Drumaspis
†Dysoristus

E

†Echinaria
†Echinauris – or unidentified related form
†Echinochimaera – type locality for genus
- †Echinochimaera meltoni – type locality for species

- †Echinochimaera snyderi – type locality for species
†Echinocoelia
- †Echinocoelia youngstownensis
†Echinoconchus
- †Echinoconchus alternatus – or unidentified related form
- †Echinoconchus angustus – type locality for species
†Echinocrinus
†Edmondia
- †Edmondia E. marionensis – or unidentified comparable form
- †Edmondia stuchburia
†Ehmania – tentative report
†Eleutherokomma
- †Eleutherokomma raymondi
†Elrathiella – or unidentified comparable form
†Elrathina
†Elvinia
- †Elvinia roemeria
†Emanuella
†Enygmophyllum
Eocaudina
- †Eocaudina columcanthus
- †Eocaudina marginata
- †Eocaudina subhexagona
†Eolissochonetes
- †Eolissochonetes pseudoliratus – type locality for species
†Eoorthis
- †Eoorthis remnicha
†Euconia
- †Euconia umbilicata
†Euloma
†Eumetria
- †Eumetria acuticosta
- †Eumetria vera – or unidentified comparable form
- †Eumetria verneuilana – or unidentified comparable form
- †Eumetria verneuiliana – or unidentified comparable form
†Euphemites
- †Euphemites crenulatus
- †Euphemites sacajawensis
†Euphemitopsis
- †Euphemitopsis paucinodosus – or unidentified comparable form
- †Euphemitopsis subpapillosa
†Exochops

F

†Faberophyllum
Life restorations of a female (top) and male (bottom) of the Carboniferous Chimaera relative Falcatus
†Falcatus
- †Falcatus falcatus
†Fasciculiamplexus
†Fasciculophyllum
†Favosites
†Fenestella
†Fenestralia – tentative report
†Fenestrella
†Finestrella – tentative report
†Floweria
- †Floweria chemungensis – or unidentified comparable form
†Furcaster

G

†Gattendorfia
- †Gattendorfia costata
†Gennaeocrinus – or unidentified comparable form
Fossil of the Early-Late Ordovician trilobite Geragnostus
†Geragnostus
†Girtyella
- †Girtyella indianensis
- †Girtyella woodsworthi – or unidentified comparable form
- †Girtyella woodworthi
†Glabretina – type locality for genus
- †Glabretina andrewsi – type locality for species
†Glabrocingulum – tentative report
†Glaphyraspis
- †Glaphyraspis parva
†Glossopleura
†Glyphaspis
- †Glyphaspis robusta
†Grammysia
- †Grammysia G. welleri – or unidentified comparable form
†Graphiadactyllis
†Guizhoupecten

H

†Hadronector – type locality for genus
- †Hadronector donbairdi – type locality for species
†Hallograptus
†Hamburgia – tentative report
- †Hamburgia walteri – or unidentified comparable form
†Hammatocyclus
†Haplistion
†Hapsiphyllum
†Hardistiella – type locality for genus
- †Hardistiella montanensis – type locality for species
Restoration (bottom) of the Carboniferous "antlered" Chimaera relative Harpagofututor
†Harpagofututor – type locality for genus
- †Harpagofututor volsellorhinus – type locality for species
†Helicoprion
†Heteralosia
- †Heteralosia beecheri
†Heteropecten
- †Heteropecten vanvleeti – or unidentified comparable form
†Heteropetalus – type locality for genus
- †Heteropetalus elegantulus – type locality for species

†Homalophyllites
†Homotreta
- †Homotreta interrupta
†Hormotoma
†Horridonia – report made of unidentified related form or using admittedly obsolete nomenclature
†Housia
- †Housia canadensis
†Huenella
†Hunanospirifer
- †Hunanospirifer animasensis
- †Hunanospirifer gallatinensis – tentative report
- †Hunanospirifer monticola
†Hustedia
- †Hustedia texana
Fossilized shells of the Cambrian-Permian brachiopod relative Hyolitha
†Hyolithes
Hyperammina
†Hypothyris
†Hypseloconus
- †Hypseloconus elongatus
- †Hypseloconus simplex
†Hystriculina
- †Hystriculina wabashensis – or unidentified comparable form
†Hystricurus

I

†Icodonta
- †Icodonta nixonensis – or unidentified comparable form
- †Icodonta typica
†Idahoia
†Imbrexia
†Imbricatia
†Imitoceras
†Inflatia
- †Inflatia inflata – or unidentified comparable form
†Iphidella
- †Iphidella hexagona
- †Iphidella nyssa
†Irvingella

J

Restoration of the Carboniferous-Permian ray-like cartilaginous fish Janassa (top and left)
†Janassa
- †Janassa clarki – type locality for species
†Joanellia
- †Joanellia lundi
†Juresania