# List of the Paleozoic life of Colorado

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

## A

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* †Acanthatia
** †Acanthatia nupera
* †Acondylacanthus
** †Acondylacanthus nuperus
* †Actinoceras
* †Adiantites
** †Adiantites rockymontanus – type locality for species
* †Aglaocrinus
** †Aglaocrinus magnus
* †Allumettoceras
* †Amorphognathus
** †Amorphognathus ramosa
* †Amplexizaphrentis
** †Amplexizaphrentis pamatus
* †Amplexus
* †Anthracoblattina
** †Anthracoblattina triassica – type locality for species
* †Anthracospirifer
** †Anthracospirifer tanoensis
* †Antiquatonia
** †Antiquatonia coloradoensis
* †Araucarites
* †Archaeocidaris
** †Archaeocidaris cratis
** †Archaeocidaris ourayensis
** †Archaeocidaris triplex
* †Asterophyllites
** †Asterophyllites charaeformis
** †Asterophyllites longifolius – tentative report
* Life restoration of the Middle-Late Ordovician jawless fish Astraspis †Astraspis – type locality for genus
** †Astraspis desiderata – type locality for species
* †Athyris
** †Athyris coloradensis
** †Athyris transversa
* †Aviculopecten

## B

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* †Beloitoceras
** †Beloitoceras accultum
* †Blothrocrinus
* †Bucanella
* †Bythiacanthus

## C

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* Fossilized stems from the Carboniferous-Permian horsetail relative Calamites †Calamites
** †Calamites cistii
** †Calamites cruciatus
** †Calamites distachyus
** †Calamites gigas
** †Calamites kutorgae – tentative report
* †Calapoecia
* †Callipteris
** †Callipteris lyratifolia – or unidentified comparable form
* †Camarotoechia
* †Caninia
* †Catactocrinus – tentative report
** †Catactocrinus torus
* Fossil of the Ordovician-Silurian tabulate coral Catenipora †Catenipora
** †Catenipora robusta – or unidentified comparable form
* †Ceraurinus
** †Ceraurinus icarus
* †Cercopyllis
** †Cercopyllis adolescens – type locality for species
** †Cercopyllis delicatula – type locality for species
** †Cercopyllis justiciae – type locality for species
* †Charactoceras – tentative report
* †Chirognathus
** †Chirognathus admiranda
** †Chirognathus aequidentata
** †Chirognathus alternata
** †Chirognathus deformis
** †Chirognathus delicatula
** †Chirognathus dubia
** †Chirognathus duodactyla
** †Chirognathus duodactylus
** †Chirognathus eucharis
** †Chirognathus gradata
** †Chirognathus idonea
** †Chirognathus maniformis
** †Chirognathus monodactyla
** †Chirognathus multidens
** †Chirognathus parallela
** †Chirognathus plana
** †Chirognathus tenuidentata
** †Chirognathus unguliformis
** †Chirognathus vulgaris
* †Coelosporella
* †Coleolus
* Fossilized shell of the Late Devonian-Permian brachiopod Composita †Composita
** †Composita gibbosa
** †Composita ovata
* †Conocardium
* †Cordaianthus
* †Cordaicarpon
* †Cordaites
** †Cordaites angulosostriatus
* †Cornulites
* †Cranaena
** †Cranaena subelliptica
* †Crania
* †Ctenacanthus
** †Ctenacanthus buttersi
** †Ctenacanthus furcicarinatus
* †Ctenodonta
* †Cupressocrinites
* Restoration of the Permian synapsid (mammal precursor) Cutleria †Cutleria – type locality for genus
** †Cutleria wilmarthi – type locality for species
* †Cyclopteris
* †Cyrtiopsis
** †Cyrtiopsis animasensis
** †Cyrtiopsis conicula
** †Cyrtiopsis kindlei
* †Cyrtodonta
* †Cyrtogomphoceras
* Fossilized shells of the Middle-Late Devonian brachiopod Cyrtospirifer †Cyrtospirifer
** †Cyrtospirifer animasensis
** †Cyrtospirifer whitneyi

## D

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* †Dactylophyllum – type locality for genus
** †Dactylophyllum johnsoni – type locality for species
* †Desmoinesia
** †Desmoinesia nambeensis
* †Dicladoblatta
** †Dicladoblatta marginata – type locality for species
* †Dicromyocrinus
** †Dicromyocrinus beldenensis
* †Dictyoclostus
* †Dictyorhabdus
** †Dictyorhabdus priscus
* †Diestoceras
* †Diplothmema
** †Diplothmema patentissima
* †Distatoblatta
** †Distatoblatta persistens – type locality for species

## E

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* †Echinosphaerites – tentative report
* Life restoration of the Late Devonian-Carboniferous Chimaera relative Edestus †Edestus
** †Edestus minor
* †Eireocrinus – tentative report
** †Eireocrinus coloradoensis
* †Endoceras
* †Epheboblatta
** †Epheboblatta attenuata – type locality for species
* †Ephippiorthoceras
* †Eretmocrinus
** †Eretmocrinus sawdoi – type locality for species
* †Eriptychius – type locality for genus
** †Eriptychius americanus – type locality for species
* †Erismodus
** †Erismodus quadridactylus
* Life restoration of the Carboniferous-Permian amphibian Eryops †Eryops
** †Eryops grandis – or unidentified comparable form
* †Etoblattina
* †Eumetria – tentative report
* †Euomphalus
** †Euomphalus eurekensis – or unidentified comparable form
* †Eusphenopteris

## F

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* †Floweria
** †Floweria chemungensis
* †Floyda
** †Floyda concentrica

## G

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* †Garwoodia
** †Garwoodia media
* †Gilmocrinus – tentative report
** †Gilmocrinus albus
* †Girvanella
** †Girvanella nicholsoni
* †Glossites
* †Goleocrinus – tentative report
* †Gomphostrobus
** †Gomphostrobus bifidus

## H

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* Fossil of the Ordovician-Silurian tabulate coral Halysites †Halysites
** †Halysites delicatulus – or unidentified comparable form
* †Hebertella
** †Hebertella sinuaia
* †Helicelasma
** †Helicelasma rusticum – or unidentified comparable form
* †Helicotoma
* †Hiscobeccus
** †Hiscobeccus capax
* †Hudsonaster
* †Hypselocrinus – tentative report
** †Hypselocrinus bisonensis

## I

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* †Isalaux – type locality for genus
** †Isalaux canyonensis – type locality for species
* †Isonema
** †Isonema depressum
** †Isonema humlis

## K

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* †Kionoceras

## L

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* †Lambeoceras
* †Laminatia – tentative report
** †Laminatia laminata
* †Lecrosia
** †Lecrosia gouldii
* †Leioproductus
** †Leioproductus coloradensis
** †Leioproductus coloradoensis
** †Leioproductus varispinosus
* †Leperditia
* †Lepidocyclus
** †Lepidocyclus rectangularis – or unidentified comparable form
* †Lepidodendron
** †Lepidodendron johnsonii – type locality for species
* †Lepidophloios
** †Lepidophloios laricinus
* †Lepidophylloides
* †Lepidostrobophyllum
* †Lepidostrobus
** †Lepidostrobus weberensis – type locality for species
* †Leptaena
* †Leptodesma
* Life restoration of the Permian reptile precursor Limnoscelis †Limnoscelis
** †Limnoscelis dynatis – type locality for species
* †Limnoscelops – type locality for genus
** †Limnoscelops longifemur – type locality for species
* †Lingula
** †Lingula huronensis
* †Linoproductus
** †Linoproductus nodosus
* †Liospira
* †Lophospira
** †Lophospira perangulata
* †Loxonema

## M

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* †Macluritella
** †Macluritella stantoni
* †Macrostachya – tentative report
* †Mariopteris
** †Mariopteris pygmaea – or unidentified comparable form
* †Meekospira
* †Meristella
* †Modiolopsis
* †Mooreoceras
* †Mytilarca

## N

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* †Nearoblatta
** †Nearoblatta rotundata – type locality for species
* †Neochonetes
** †Neochonetes whitei – or unidentified comparable form
* †Neorthroblattina
** †Neorthroblattina albolineata – type locality for species
* Fossilized shell of the Carboniferous-Permian brachiopod Neospirifer †Neospirifer
** †Neospirifer goreii
* †Neumatoceras
* †Neuralethopteris
* †Neuropteris
** †Neuropteris auriculata
** †Neuropteris dluhoschi
** †Neuropteris gigantea – tentative report
** †Neuropteris heterophylla

## O

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* †Odontopteris
** †Odontopteris mccoyensis
** †Odontopteris subcrenulata
* Life restoration of the Carboniferous-Permian synapsid (mammal precursor) Ophiacodon †Ophiacodon
* †Ophiopolytretus
** †Ophiopolytretus aethus
* †Oradectes
** †Oradectes sanmiguelensis – type locality for species
* †Ormoceras
** †Ormoceras pollacki
* †Orthoceras
* †Orthodesma
* †Orthonota
* †Orthotetes
** †Orthotetes inequalis
* †Ortonella
** †Ortonella kershopensis
* †Oulodus
** †Oulodus serratus

## P

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* †Pachystrophia
** †Pachystrophia contiguus
* †Paladin – tentative report
* †Palaeoglossa
** †Palaeoglossa hurlbuti
* †Parachaetetes
** †Parachaetetes glenwoodensis
* †Paurorhyncha
** †Paurorhyncha cooperi – or unidentified comparable form
** †Paurorhyncha endlichi
* Fossils of the Late Devonian-Permian fern-like fronds Pecopteris †Pecopteris
** †Pecopteris arborescens
** †Pecopteris pinnatifida
* †Pentaricida
** †Pentaricida pentagonalis
* †Pentaridica
** †Pentaridica pentagonalis
* †Petrablattina
** †Petrablattina aequa – type locality for species
* †Petrodus
** †Petrodus patelliformis
* †Phyloblatta
** †Phyloblatta meieri – type locality for species
* †Physonemus
* †Plaesiomys
** †Plaesiomys bellilamellosus
** †Plaesiomys proavitus
* †Planoproductus
** †Planoproductus depressus
** †Planoproductus hillsboroensis – or unidentified comparable form
** †Planoproductus hillsbororensis – or unidentified comparable form
* †Platyceras
* Life restoration of the Carboniferous-Permian sail-backed amphibian Platyhystrix †Platyhystrix
** †Platyhystrix rugosus
* †Pleiadeaster
** †Pleiadeaster inceptus
* †Poroblattina
** †Poroblattina arcuata – type locality for species
** †Poroblattina lakesii – type locality for species
** †Poroblattina parvula – type locality for species
* †Porostictia
** †Porostictia perchaensis
* †Probillingsites
** †Probillingsites kessleri
* †Productella
* †Protocycloceras
** †Protocycloceras manitouense
* †Pseudochaetes
** †Pseudochaetes similis
* †Psygmophyllum
** †Psygmophyllum cuneifolium – or unidentified comparable form
* †Ptiloporella
* †Ptychomalotoechia
** †Ptychomalotoechia sobrina
* †Pugnax
* †Pugnoides
* †Punctospirifer
** †Punctospirifer solidirostris

## R

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* Fossil of the Early Ordovician-Permian benthic alga Receptaculites †Receptaculites
** †Receptaculites articus – or unidentified comparable form
* †Reticularia
* †Rhabdocarpus
** †Rhabdocarpus dyadicus
* †Rhombopora
* †Rhynchospirina
** †Rhynchospirina scansa – or unidentified related form
* †Rhynchotrema
** †Rhynchotrema argenturbicum
* †Robsonoceras
** †Robsonoceras manitouense

## S

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* †Saffordophyllum
** †Saffordophyllum franklini
* †Samaropsis
** †Samaropsis hesperius
* †Sandia
** †Sandia welleri
* †Schizodus
** †Schizodus acuminatus
* †Schizophoria
** †Schizophoria austalis
** †Schizophoria australis
* †Schuchertella
** †Schuchertella coloradoensis
* †Scolecopteris
** †Scolecopteris elegans
* Fossilized skeleton of the Permian primitive four-limbed animal Seymouria †Seymouria
* †Sigillaria
** †Sigillaria elegans – or unidentified comparable form
** †Sigillaria ovata
* †Sigillariostrobus
** †Sigillariostrobus hastatus
* †Sphenophyllum
** †Sphenophyllum obovatum
* †Sphenopteris
** †Sphenopteris asplenioides
** †Sphenopteris cheathami
** †Sphenopteris microcarpa – or unidentified comparable form
** †Sphenopteris schimperiana – tentative report
* †Spiloblattina
** †Spiloblattina weissigensis – type locality for species
* †Spiloblattinidae
** †Spiloblattinidae gardinerana – type locality for species
* Fossilized shell of the Late Ordovician-Late Triassic brachiopod Spirifer †Spirifer
** †Spirifer centronatus
* Spirorbis
* †Spyroceras
* †Stereoconus
** †Stereoconus gracilis
* †Stigmaria
** †Stigmaria ficoides
** †Stigmaria verrucosa
* †Straparollus
** †Straparollus clymenioides – or unidentified comparable form
* †Streblopteria
* †Strepsodiscus – type locality for genus
** †Strepsodiscus major – type locality for species
* †Streptelasma
* †Strimplecrinus
** †Strimplecrinus dyerensis
* Fossilized shell of the Ordovician-Silurian brachiopod Strophomena †Strophomena
* †Strophopleura
** †Strophopleura notabilis
* †Synarmocrinus
** †Synarmocrinus cobbani
* †Syringodendron
* †Syringopora
** †Syringopora surcularia
* †Syringospira
** †Syringospira prima

## T

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* †Tarassocrinus
** †Tarassocrinus synchlydus
* †Tarthinia
* Fossil of the Silurian-Carboniferous crinoid ("sea lily") Taxocrinus (right) †Taxocrinus
* †Toernquistia
* †Trichopitys
** †Trichopitys whitei
* †Trochonema
** †Trochonema umbilicata

## U

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* †Ullmannia
* †Ulocrinus
** †Ulocrinus rockymontanus

## V

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* †Vanuxemia
** †Vanuxemia rotundata
* †Vaughnictis
** †Vaughnictis smithae – type locality for species

## W

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* Fossilized foliage of the Carboniferous-Permian conifer Walchia †Walchia
** †Walchia hypnoides
** †Walchia imbricata – or unidentified comparable form
** †Walchia piniformis
** †Walchia stricta
* †Walchiastrobus
* †Westonoceras
* †Wewokella
** †Wewokella solida
* †Wilbernicyathus
** †Wilbernicyathus donegani

## Z

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* †Zaphrenthis
* †Zygospira
** †Zygospira modesta – tentative report