List of the Mesozoic life of Colorado

This list of the Mesozoic 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 252.17 and 66 million years of age.

A

†Acanthichnus – tentative report
Acila
- †Acila chicotana
Acmaea
- †Acmaea genettae – type locality for species
†Adocus
†Albanerpeton
- †Albanerpeton nexuosus
†Albertosaurus – tentative report
†Aletridelphys
- †Aletridelphys hatcheri
†Allantodiopsis
- †Allantodiopsis erosa
- †Allantodiopsis JC018 – informal
Life restoration of the Late Jurassic theropod dinosaur Allosaurus
†Allosaurus – type locality for genus
- †Allosaurus fragilis
  – type locality for species
- †Allosaurus lucasi
  – type locality for species
†Amblotherium – type locality for genus
- †Amblotherium gracilis
Amia
†Amphicoelias – type locality for genus
- †Amphicoelias altus
  – type locality for species
Fossilized skull of the Late Jurassic crocodile relative Amphicotylus
†Amphicotylus
- †Amphicotylus lucasii
  – type locality for species
†Amplovalvata
- †Amplovalvata scabrida
†Anaklinoceras
- †Anaklinoceras minutum – type locality for species
- †Anaklinoceras reflexum
†Anisoceras
- †Anisoceras plicatilis
†Anisomyon
- †Anisomyon centrale
†Anomia
- †Anomia subquadrata
- †Anomia tellinoides
Fossil (right) of the Early Jurassic dinosaur footprint ichnogenus Anomoepus
†Anomoepus – tentative report
†Apateodus
†Apatopus
†Apatosaurus – type locality for genus
- †Apatosaurus ajax
  – type locality for species
- †Apatosaurus laticollis
  – type locality for species. Junior synonym of A. louisae.
- †Apatosaurus louisae
†Arcellites
- †Arcellites disciformis
†Archaeolamna
- †Archaeolamna kopingensis
†Arenicolites
Aspideretes
- †Aspideretes vagans – type locality for species
†Aspideretoides
Astarte
†Atlantosaurus
- †Atlantosaurus immanis
  – type locality for species
†Axonoceras
- †Axonoceras compressum

B

†Baculites
- †Baculites aquilaensis
- †Baculites asper
- †Baculites clinolobatus
  – type locality for species
- †Baculites codyensis
- †Baculites compressus
- †Baculites cuneatus
- †Baculites grandis
- †Baculites haresi
- †Baculites mclearni
- †Baculites meeki
  – type locality for species
- †Baculites reesidei
Restoration of the Late Jurassic sauropod dinosaur Barosaurus rearing to defend itself against a pair of the theropod Allosaurus
†Barosaurus
†Basilemys
- †Basilemys sinuosa – or unidentified comparable form
†Behuninia
- †Behuninia provoensis
†Bellifusus
†Bison
- †Bison alticornis
  – type locality for species
†Borealosuchus
- †Borealosuchus sternbergii
†Brachauchenius – or unidentified comparable form
†Brachiosaurus – type locality for genus
- †Brachiosaurus altithorax
  – type locality for species
†Brachychampsa
- †Brachychampsa montana
†Brachychirotherium
†Brachyphyllum
- †Brachyphyllum rechtenii – type locality for species
Life restoration of a herd of the Late Jurassic sauropod dinosaur Brontosaurus
†Brontosaurus
- †Brontosaurus excelsus
- †Brontosaurus yahnahpin

C

†Calycoceras
- †Calycoceras canitaurinum
- †Calycoceras naviculare
Life restoration of a herd of the Late Jurassic sauropod dinosaur Camarasaurus
†Camarasaurus – type locality for genus
- †Camarasaurus agilis – type locality for species
- †Camarasaurus grandis
- †Camarasaurus lewisi
- †Camarasaurus supremus – type locality for species
†Camptosaurus – type locality for genus
- †Camptosaurus dispar
  – type locality for species
Carcharias
- †Carcharias amonensis
- †Carcharias saskatchewanensis
- †Carcharias tenuiplicatus
†Caririchnium
- †Caririchnium leonardii – type locality for species
- †Caririchnium leonaridii
†Cataceramus
- †Cataceramus gladbeckensis
†Cedrobaena
- †Cedrobaena brinkman
†Ceratodus
– type locality for genus
- †Ceratodus felchi – type locality for species
- †Ceratodus guentheri
  – type locality for species
Restoration of the Late Jurassic ceratosaur Ceratosaurus
†Ceratosaurus – type locality for genus
- †Ceratosaurus nasicornis
  – type locality for species
Cerithiopsis
†Champsosaurus
Chara
†Chelonipus
†Chinlea
- †Chinlea sorenseni
†Chinlestegophis – type locality for genus
- †Chinlestegophis jenkinsi – type locality for species
†Chirotherium
- †Chirotherium lulli
†Cimolichthys
- †Cimolichthys nepaholica
†Cimolodon – or unidentified comparable form
Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys
†Cimolomys
†Cionichthys
- †Cionichthys dunklei
†Cionodon – type locality for genus
- †Cionodon arctatus
  – type locality for species
†Cirroceras
- †Cirroceras conradi
†Cladoceramus
- †Cladoceramus undulatoplicatus
†Clidastes
†Clioscaphites
- †Clioscaphites choteauensis
- †Clioscaphites saxitonianus
- †Clioscaphites vermiformis
†Coahuilites
- †Coahuilites sheltoni
†Cochlichnus
†Codellaster – type locality for genus
- †Codellaster keepersae – type locality for species
†Coelophysis – tentative report
Diagram illustrating the known fossil material of the Late Jurassic theropod dinosaur Coelurus
†Coelurus
- †Coelurus fragilis
†Compsemys
- †Compsemys victa
†Coniasaurus
- †Coniasaurus crassidens
Corbula
†Corydalites – type locality for genus
- †Corydalites fecundum – type locality for species
Crassatella
- †Crassatella franzeseii
†Cremnoceramus
- †Cremnoceramus deformis
†Crenella
†Creonella
- †Creonella triplicata
†Cretodus
- †Cretodus semiplicatus
†Cretolamna
- †Cretolamna appendiculata
†Cretomanta
- †Cretomanta canadensis
Restoration of the Late Cretaceous shark Cretoxyrhina, or the Ginsu shark
†Cretoxyrhina
- †Cretoxyrhina mantelli
Cucullaea
- †Cucullaea nebrascensis
Cuspidaria
- †Cuspidaria ventricosa
†Czekanowskia
- †Czekanowskia turneri – tentative report

D

†Diablophis
- †Diablophis gilmorei – type locality for species
†Didymoceras
- †Didymoceras aurarium – type locality for species
- †Didymoceras cheyennense
- †Didymoceras draconis
- †Didymoceras stevensoni
†Dinehichnus
- †Dinehichnus socialis
†Dinochelys
- †Dinochelys whitei
D. hallorum (orange) with an anachronistic human to scale.
†Diplodocus

– type locality for genus

†Diplodocus lacustris
– type locality for species
†Diplodocus longus
– type locality for species

Diplodonta

†Diplodonta davisi

†Diplosaurus

†Diplosaurus felix – type locality for species

Discinisca

†Discoscaphites

†Discoscaphites conradi

†Docodon

†Docodon apoxys
– type locality for species

†Dorsetisaurus

†Dorsetochelys

†Dorsetochelys buzzops – type locality for species

†Drepanocheilus

†Dryophyllum

†Dryophyllum tennesseensis

†Dryosaurus

†Dryosaurus altus

E

†Edmontonia
Skeletal reconstruction and restored soft tissue of the Late Cretaceous duck-billed dinosaur Edmontosaurus regalis with an anachronistic human to scale
†Edmontosaurus
- †Edmontosaurus regalis – type locality for species
Eilenodon – type locality for genus
- †Eilenodon robustus – type locality for species
†Elopopsis
†Enchodus
- †Enchodus gladiolus
  – or unidentified comparable form
- †Enchodus shumardi
  – or unidentified comparable form
†Entolium
†Eoacteon
- †Eoacteon sublinearis
†Eomunidopsis
- †Eomunidopsis cobbani – type locality for species
†Eosauropus
- †Eosauropus cimarronensis
- †Eosauropus cimmaronensis
A living Equisetum, or horsetail
†Equisetum
- †Equisetum burchardtii – or unidentified comparable form
†Etea
- †Etea peasei
†Eubrontes
- †Eubrontes giganteus
†Eucalycoceras
- †Eucalycoceras pentagonum
†Euomphaloceras
- †Euomphaloceras septemseriatum
†Eutrephoceras
- †Eutrephoceras dekayi
†Eutretauranosuchus – type locality for genus
- †Eutretauranosuchus delfsi
  – type locality for species
†Exiteloceras
- †Exiteloceras jenneyi
†Exogyra
- †Exogyra boveyensis – or unidentified related form

F

Fossilized shell of the Late Cretaceous ammonoid cephalopod Fagesia
†Fagesia
Ficus
- †Ficus planicostata
†Forresteria
- †Forresteria hobsoni – type locality for species
†Fruitachampsa – type locality for genus
- †Fruitachampsa callisoni
  – type locality for species
†Fruitadens – type locality for genus
- †Fruitadens haagarorum
  – type locality for species
†Fruitafossor – type locality for genus
- †Fruitafossor windscheffeli
  – type locality for species

G

Fossilized skull of the Late Jurassic sauropod dinosaur Galeamopus
†Galeamopus
- †Galeamopus pabsti
†Glirodon
- †Glirodon grandis
†Glyptops
- †Glyptops plicatulus – type locality for species
†Goniopholis
- †Goniopholis felchi – type locality for species
†Grallator
- †Grallator cursorius
- †Grallator tenuis
†Gryphaeostrea
†Gwyneddichnium
†Gypsonictops
†Gyroides

H

Restoration of the Late Jurassic crocodile relative Hallopus
†Hallopus
- †Hallopus victor
  – type locality for species
†Haplocanthosaurus – type locality for genus
- †Haplocanthosaurus delfsi
  – type locality for species
- †Haplocanthosaurus priscus
  – type locality for species
†Harduinia
- †Harduinia stantoni
- †Harduinia taylori
†Haresiceras
- †Haresiceras placentiforme
†Helopanoplia
- †Helopanoplia distincta – or unidentified comparable form
†Hemicalypterus
†Hermanophyton
Fossilized shell of the Late Cretaceous ammonoid cephalopod Herrickiceras
†Herrickiceras
- †Herrickiceras costatus
†Holaster
- †Holaster feralis – type locality for species
†Homolopsis
†Hoploscaphites^[1]
- †Hoploscaphites birkelundae
- †Hoploscaphites landesi
- †Hoploscaphites macer^[1]
- †Hoploscaphites nicolletii
†Hulettia – report made of unidentified related form or using admittedly obsolete nomenclature
- †Hulettia hawesi – type locality for species
†Hypsirophus
– type locality for genus
- †Hypsirophus discurus – type locality for species

I

†Ichthyodectes
†Ignotornis – type locality for genus
- †Ignotornis mcconnelli – type locality for species
Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
†Inoceramus
- †Inoceramus altus
- †Inoceramus altusiformis
- †Inoceramus anomalus
- †Inoceramus arnoldi
- †Inoceramus balticus
- †Inoceramus brancoiformis
- †Inoceramus bueltenensis
- †Inoceramus cordiformis
- †Inoceramus crippsi
  – or unidentified related form
- †Inoceramus deformis
- †Inoceramus erectus
- †Inoceramus flavus
- †Inoceramus grandis
- †Inoceramus longealatus
- †Inoceramus muelleri
  - or unidentified loosely related form
- †Inoceramus oblongus
- †Inoceramus pictus
- †Inoceramus prefragilis
- †Inoceramus rutherfordi
  – or unidentified comparable form
- †Inoceramus tenuistriatus
  – tentative report
†Ischyrhiza
- †Ischyrhiza avonicola
  – or unidentified comparable form

J

Fossilized shell of the Late Cretaceous ammonoid cephalopod Jeletzkytes
†Jeletzkytes
- †Jeletzkytes brevis
- †Jeletzkytes dorfi
- †Jeletzkytes nodosus
†Jensensispermum
- †Jensensispermum redmondii
Jupiteria
- †Jupiteria scitula

K

†Kepodactylus – type locality for genus
- †Kepodactylus insperatus
  – type locality for species

L

†Laosaurus – report made of unidentified related form or using admittedly obsolete nomenclature
Laternula
Lepisosteus – tentative report
- †Lepisosteus occidentalis
†Leptalestes – tentative report
- †Leptalestes cooki
Restoration of a school of the Middle Triassic-Early Cretaceous bony fish Leptolepis
†Leptolepis – or unidentified comparable form
†Lewyites
- †Lewyites oronensis
Lima
- †Lima janetae – type locality for species
†Lingula
†Lioestheria
- †Lioestheria tendagurensis – or unidentified comparable form
†Lisserpeton
- †Lisserpeton bairdi
†Lonchidion
- †Lonchidion selachos
†Lucina
†Lyropecten

M

Diagram illustrating the known fossil material of two specimens of the Late Jurassic crocodile relative Macelognathus
†Macelognathus
- †Macelognathus vagans
†Magadiceramus
- †Magadiceramus complicatus
- †Magadiceramus crenelatus
- †Magadiceramus soukupi - or unidentified loosely related form
- †Magadiceramus subquadratus
†Magnoavipes
- †Magnoavipes caneeri – type locality for species
†Marmarthia – or unidentified comparable form
- †Marmarthia pearsonii
†Marshosaurus – or unidentified comparable form
Fossilized skull of the Late Cretaceous multituberculate mammal Meniscoessus
†Meniscoessus
- †Meniscoessus collomensis
  – type locality for species
- †Meniscoessus conquistus
- †Meniscoessus robustus
  – or unidentified comparable form
†Mesadactylus – type locality for genus
- †Mesadactylus ornithosphyos
  – type locality for species
†Mesembrioxylon
- †Mesembrioxylon carterii – type locality for species
†Mesodma
- †Mesodma formosa
  – or unidentified comparable form
†Mesojassoides – type locality for genus
- †Mesojassoides gigantea
  – type locality for species
†Mesolanistes
- †Mesolanistes reesidei
†Metengonoceras
- †Metengonoceras dumbli
†Metoicoceras
- †Metoicoceras geslinianum
†Micrabacia
- †Micrabacia radiata
†Micropycnodon
- †Micropycnodon kansasensis
†Modiolus
- †Modiolus kremmlingensis – type locality for species
- †Modiolus meeki
†Moremanoceras
- †Moremanoceras scotti
†Morosaurus
- †Morosaurus laticollis – type locality for species
†Morrolepis
- †Morrolepis schaefferi – type locality for species
†Myledaphus
- †Myledaphus bipartitus
Mounted fossilized skeleton of the Late Jurassic armored dinosaur Mymoorapelta
†Mymoorapelta – type locality for genus
- †Mymoorapelta maysi
  – type locality for species
Myrica
- †Myrica torreyi
†Mytiloides
- †Mytiloides duplicostatus – or unidentified related form
- †Mytiloides latus – or unidentified comparable form
- †Mytiloides mytiloides
- †Mytiloides opalensis
- †Mytiloides stantoni – or unidentified comparable form
- †Mytiloides submytiloides – or unidentified related form