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 †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 †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 †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 †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 †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 †Composita †Composita humilis †Composita laevis †Composita lateralis – or unidentified comparable form †Composita madisonensis †Composita ovata †Composita ozarkana †Composita sulcata †Conularia †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 †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 †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 †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 †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 †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 †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 †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
†Janassa †Janassa clarki – type locality for species †Joanellia †Joanellia lundi †Juresania
K
†Kainella †Kainella flagricauda †Kallimorphocrinus †Kalops †Kalops diophrys †Kalops monophrys †Katabuporhynchus †Katabuporhynchus mesacostalis †Kayseraspis †Kendallina †Kindbladia †Komiella †Komiella ostiolata †Koninkophyllum – tentative report †Kootenia †Kyphocephalus
L
†Labiostria †Laminatia †Laminatia laminata – tentative report †Langepis †Langepis campbelli †Lecanospira †Leioestheria †Leioproductus †Leioproductus coloradensis †Leioproductus montanensis – type locality for species †Leioproductus plicatus †Leiorhynchus †Leiorhynchus carboniferus