List_of_the_prehistoric_life_of_Colorado
This list of the prehistoric life of Colorado contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Colorado.
The Paleobiology Database records no known occurrences of Precambrian fossils in Colorado.
Main article: List of the Paleozoic life of Colorado
Selected Paleozoic taxa of Colorado
- †Actinoceras
- †Aglaocrinus
- †Amorphognathus
- †Amplexus
- †Archaeocidaris
Life restoration of the Middle-Late Ordovician jawless fish Astraspis - †Astraspis desiderata – type locality for species
- †Athyris
- †Aviculopecten
- †Calamites
- †Callipteris
- †Callipteris lyratifolia – or unidentified comparable form
- †Camarotoechia
- †Caninia
Fossil of the Ordovician-Silurian tabulate coral Catenipora - †Ceraurinus
- †Charactoceras – tentative report
- †Chirognathus
- †Composita
- †Conocardium
- †Cordaites
- †Cornulites
- †Crania
- †Ctenacanthus
- †Cupressocrinites
Restoration of the Permian synapsid (mammal precursor) Cutleria - †Cutleria wilmarthi – type locality for species
- †Cyclopteris
- †Cyrtogomphoceras
- †Cyrtospirifer
- †Echinosphaerites – tentative report
- †Edestus
- †Endoceras
- †Eretmocrinus
Life restoration of the Carboniferous-Permian amphibian Eryops - †Euomphalus
- †Girvanella
- †Halysites
- †Isalaux – type locality for genus
- †Isonema
- †Kionoceras
- †Lambeoceras
- †Lepidodendron
- †Lepidostrobus
- †Limnoscelis
- †Lingula
- †Meristella
- †Neospirifer
- †Neuropteris
- †Neuropteris auriculata
- †Neuropteris gigantea – tentative report
- †Neuropteris heterophylla
Restoration of the Carboniferous-Permian synapsid (mammal precursor) Ophiacodon - †Oradectes
- †Ormoceras
- †Orthoceras
- †Oulodus
- †Paladin – tentative report
- †Pecopteris
- †Plaesiomys
- †Platyceras
Life restoration of the Carboniferous-Permian sail-backed amphibian Platyhystrix - †Pugnax
- †Receptaculites
- †Samaropsis
- †Sandia
- †Seymouria
- †Sigillaria
- †Sigillaria elegans – or unidentified comparable form
- †Sphenophyllum
- †Sphenopteris
- †Spirifer
- Spirorbis
- †Spyroceras
- †Stigmaria
- †Strepsodiscus – type locality for genus
- †Strophomena
- †Syringopora
Fossil of the Silurian-Carboniferous crinoid ("sea lily") Taxocrinus (right) - †Walchia
- †Westonoceras
Main article: List of the Mesozoic life of Colorado
Selected Mesozoic taxa of Colorado
- Acmaea
- †Adocus
- †Albanerpeton
- †Albertosaurus – tentative report
Life restoration of the Late Jurassic theropod dinosaur Allosaurus - †Allosaurus fragilis – type locality for species
- †Amblotherium – type locality for genus
- Amia
- †Amphicoelias – type locality for genus
- †Amphicoelias altus – type locality for species
- †Amphicotylus
- †Amphicotylus lucasii – type locality for species
- †Anaklinoceras
- †Anisoceras
- †Anomia
- †Anomoepus – tentative report
- †Apateodus
- †Apatopus
Comparison of A. ajax (orange) and A. louisae (red) with a human (blue) and Brontosaurus parvus (green) - †Apatosaurus ajax – type locality for species
- †Apatosaurus louisae – type locality for species
- †Arenicolites
- Aspideretes
- Astarte
- †Atlantosaurus
- †Atlantosaurus immanis – type locality for species
- †Axonoceras
Fossilized shell of the Late Cretaceous ammonoid cephalopod 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
- †Barosaurus
Fossilized skeleton of the Cretaceous turtle Basilemys - †Bison
- †Bison alticornis – type locality for species
- †Borealosuchus
- †Brachauchenius – or unidentified comparable form
- †Brachiosaurus – type locality for genus
- †Brachiosaurus altithorax – type locality for species
- †Brachychampsa
- †Brachyphyllum
Life restoration of a herd of the Late Jurassic sauropod dinosaur Brontosaurus - †Calycoceras
- †Camarasaurus – type locality for genus
- †Camarasaurus grandis
- †Camarasaurus lewisi
- †Camarasaurus supremus – type locality for species
- †Camptosaurus – type locality for genus
- †Camptosaurus dispar – type locality for species
- Carcharias
- †Caririchnium
- †Cedrobaena
- †Ceratodus – type locality for genus
Restoration of the Late Jurassic ceratosaur Ceratosaurus - †Ceratosaurus nasicornis – type locality for species
- Cerithiopsis
- †Champsosaurus
- Chara
- †Chelonipus
- †Chinlea
- †Chirotherium
- †Cimolichthys
- †Cimolodon – or unidentified comparable form
Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys - †Cionodon – type locality for genus
- †Cionodon arctatus – type locality for species
- †Cirroceras
- †Clidastes
- †Coelophysis – tentative report
- †Coelurus
- †Compsemys
- †Coniasaurus
- Corbula
- †Crenella
- †Cretolamna
- †Cretoxyrhina
- Cucullaea
- Cuspidaria
- †Didymoceras
- †Dinehichnus
- †Dinochelys
Diagram illustrating the Late Jurassic sauropod dinosaurs Diplodocus carnegii (green) and D. hallorum (orange) with an anachronistic human to scale. - †Diplodocus lacustris – type locality for species
- †Diplodocus longus – type locality for species
- †Diplosaurus
- Discinisca
- †Discoscaphites
- †Docodon
- †Dorsetisaurus
- †Dorsetochelys
- †Dryosaurus
- †Edmontonia
Skeletal reconstruction and restored soft tissue of the Late Cretaceous duck-billed dinosaur Edmontosaurus regalis with an anachronistic human to scale - †Edmontosaurus regalis – type locality for species
- Eilenodon – type locality for genus
- †Elopopsis
- †Enchodus
- †Enchodus gladiolus – or unidentified comparable form
- †Enchodus shumardi – or unidentified comparable form
- †Equisetum
- †Eubrontes
- †Eucalycoceras
- †Euomphaloceras
- †Eutrephoceras
- †Eutretauranosuchus – type locality for genus
- †Eutretauranosuchus delfsi – type locality for species
- †Exiteloceras
- †Exogyra
Fossilized shell of the Late Cretaceous ammonoid cephalopod Fagesia - Ficus
- †Forresteria
- †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
- †Galeamopus
- †Glirodon
- †Glyptops
Restoration of the Late Jurassic-Early Cretaceous crocodile relative Goniopholis - †Grallator
- †Hallopus
- †Hallopus victor – type locality for species
- †Haplocanthosaurus – type locality for genus
- †Haplocanthosaurus delfsi – type locality for species
- †Haplocanthosaurus priscus – type locality for species
- †Hemicalypterus
- †Herrickiceras
- †Hoploscaphites
- †Hulettia – report made of unidentified related form or using admittedly obsolete nomenclature
- †Hypsirophus – type locality for genus
- †Ichthyodectes
- †Ignotornis – type locality for genus
Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size - †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
Fossilized shell of the Late Cretaceous ammonoid cephalopod Jeletzkytes - †Kepodactylus – type locality for genus
- †Kepodactylus insperatus – type locality for species
- †Laosaurus – report made of unidentified related form or using admittedly obsolete nomenclature
- Lepisosteus – tentative report
- †Leptalestes – tentative report
- †Leptolepis – or unidentified comparable form
- Lima
- †Lingula
- †Lioestheria
- †Lisserpeton
- †Lonchidion
- †Lucina
- †Macelognathus
- †Magnoavipes
- †Marshosaurus – or unidentified comparable form
Fossilized skull of the Late Cretaceous multituberculate mammal Meniscoessus - †Meniscoessus collomensis – type locality for species
- †Meniscoessus robustus – or unidentified comparable form
- †Mesadactylus – type locality for genus
- †Mesadactylus ornithosphyos – type locality for species
- †Mesodma
- †Mesodma formosa – or unidentified comparable form
- †Mesojassoides – type locality for genus
- †Mesojassoides gigantea – type locality for species
- †Metoicoceras
- †Micropycnodon
- †Modiolus
- †Morosaurus
- †Morrolepis
- †Myledaphus
Fossilized skeleton of the Late Jurassic armored dinosaur Mymoorapelta - †Mymoorapelta maysi – type locality for species
- Myrica
- †Nanosaurus – type locality for genus
- †Nanosaurus agilis – type locality for species
- †Nanosaurus rex
- Natica
- †Neocardioceras
- †Neocardioceras densicostatum – type locality for species
- †Neocardioceras juddii
- †Neocardioceras laevigatum
- †Neocardioceras minutum
- †Neocardioceras uptonense
- †Neoptychites
Restoration of several species of the Late Cretaceous ammonoid cephalopod Nostoceras - †Nostoceras approximans – or unidentified comparable form
- †Nostoceras larimerense – type locality for species
- †Nostoceras monotuberculatum
- †Nostoceras obtusum – or unidentified comparable form
- †Nostoceras splendidum – or unidentified comparable form
- Nucula
- †Odaxosaurus
- †Opisthias
- †Opisthotriton
- †Ornitholestes – tentative report
- †Ornithomimipus
- †Ornithomimus – type locality for genus
- †Ornithomimus velox – type locality for species
- Ostrea
- †Othnielia – tentative report
- †Othnielosaurus
- †Oxytoma
Fossilized skull of the Late Cretaceous dome-headed dinosaur Pachycephalosaurus - †Pachyrhizodus
- †Palaeobalistum
- †Palaeopteryx – type locality for genus
- †Parabrontopodus – type locality for genus
- †Paramacellodus
- †Paressonodon – type locality for genus
- †Parikimys – type locality for genus
- †Parviraptor
- †Pentaceratops
- †Pinna
- †Placenticeras
Fossilized shell of the Cretaceous marine bivalve Platyceramus - †Platyceramus ahsenensis
- †Platyceramus cycloides
- †Platyceramus mantelli - or unidentified loosely related form
- †Platyceramus platinus
- †Platyognathus
- †Plesiobaena
- †Polyonax – type locality for genus
- †Polyonax mortuarius – type locality for species
- †Preprismatoolithus
- †Priacodon
- †Priacodon fruitaensis – type locality for species
Fossilized skull of the Late Cretaceous mosasaur Prognathodon - †Prognathodon overtoni
- †Prognathodon stadtmani – type locality for species
- Propeamussium
- †Protocardia
- †Protosphyraena
- Prunus
- †Pseudoperna
- †Pseudotetrasauropus – tentative report
- †Pteraichnus
- †Ptychodus
- Pycnodonte
- Rhinobatos
- †Rosselia
- †Saurillodon
- †Scapherpeton
Fossilized shell of the Late Cretaceous ammonoid cephalopod Scaphites - †Scaphites binneyi
- †Scaphites depressus
- †Scaphites hippocrepis – or unidentified comparable form
- †Scaphites nodosus
- †Scoyenia
- †Selaginella
- †Semionotus
- †Sphenodiscus
- Squalicorax
- †Squatirhina
Restoration of the Late Jurassic stegosaur Stegosaurus - †Stegosaurus armatus – type locality for species
- †Stegosaurus stenops – type locality for species
- †Stegosaurus ungulatus
- †Stenomyti – type locality for genus
- †Stenomyti huangae – type locality for species
- †Stokesosaurus – or unidentified comparable form
- †Supersaurus – type locality for genus
- †Supersaurus vivianae – type locality for species
- Tellina
- †Tenea
- Teredo
- †Thalassomedon – type locality for genus
- †Thalassomedon hanningtoni – type locality for species
- †Theiophytalia – type locality for genus
- †Theiophytalia kerri – type locality for species
- †Therangospodus – or unidentified comparable form
- †Thescelosaurus
- †Titanosaurus
- †Titanosaurus montanus – type locality for species
Fossilized skulls of the Late Cretaceous horned dinosaurs Torosaurus (A) and Triceratops (B) to scale - †Torvosaurus – type locality for genus
- †Torvosaurus tanneri – type locality for species
- †Treptichnus
- †Triceratops
- †Triceratops galeus – type locality for species
- †Triceratops horridus
- †Trinacromerum – or unidentified comparable form
- Turritella
- †Tylosaurus
Fossilized skeleton of the Late Cretaceous tyrannosaur Tyrannosaurus - †Vascoceras
- Viviparus
- †Volviceramus
- †Walteria – type locality for genus
- †Watinoceras
- †Watinoceras coloradoense – type locality for species
- †Websteria
- †Xiphactinus
Main article: List of the Cenozoic life of Colorado
Selected Cenozoic taxa of Colorado
A living Abies, or fir tree - †Absyrtus
- †Acalles
- Abies
- †Absyrtus
- †Acalles
- Acer
- †Acilius
- Acris
- †Acrostichum
- †Adalia
- †Adelopsyche – type locality for genus
- †Adocus
- Aegialia
- †Aelurodon
Life restoration of the Miocene camel Aepycamelus, or the long-necked camel. Heinrich Harder (1920). - †Aeshna
- Agabus
- †Agallia
- †Agathemera
- Agelaius
- †Agnotocastor
- Agrilus
- Agriotes
- †Agromyza
- †Agulla
- †Agulla protomaculata – type locality for species
Foliage and fruits of an Ailanthus tree - †Aletodon
- Aleurites
- †Alforjas – tentative report
- †Allognathosuchus
- †Allophylus
- Altica
- †Alysia
- Amara
- †Amauropilio
- †Amblycorypha – tentative report
- †Amblyteles
- †Ambystoma
Life restoration of the Miocene elephant relative Amebelodon. Margret Flinsch (1932). - Amelanchier
- Amia
- †Ammophila
- †Ampelopsis
- †Amphechinus
- †Amphicerus
- †Amphicyon
Fossilized skull of the Miocene saber-toothed cat Amphimachairodus - †Anabrus
- Anas
- †Anasa
- †Anatis
- †Anchitherium
- Andrena
- †Andrias
- †Andricus
- †Anelaphus
- †Anemia
- †Angustidens
- Anisotoma
- †Anobium
- †Anomala
- †Anomalon
- Anser
- †Antas
- Anthaxia
- †Antherophagus
A living Anthidium, or carder bee - †Anthidium exhumatum – type locality for species
- †Anthidium scudderi – type locality for species
- †Anthomyia
- Anthonomus
- †Anthophora
- Antilocapra
- †Antocha
- Aphaenogaster
- †Aphaenogaster donisthorpei – type locality for species
- †Aphaenogaster mayri – type locality for species
- †Aphelops
- Aphodius
- Aphrophora
- Apion
- †Apolysis
- Aquila
- Araneus
- †Archaeotherium
- †Archimyrmex – type locality for genus
- †Archimyrmex rostratus – type locality for species
- †Archiponera – type locality for genus
- †Archiponera wheeleri – type locality for species
Life restoration of the Paleocene mammal Arctocyon - †Argia
- †Arhopalus
- †Aristolochia
- †Artocarpus
- †Asimina
- Asio
- †Asplenium
- †Aster
- †Astronium
- Ataenius
- †Athalia
A living Athous click beetle - †Athyana
- †Attagenus
- †Auraria – type locality for genus
- Aythya
- †Aztlanolagus
- †Baena
- †Baris
Life restoration of the Paleocene-Eocene pantodont mammal Barylambda - †Bassus
- †Bathornis – type locality for genus
- †Bathornis veredus – type locality for species
- †Bathygenys
- †Bathyopsis
- †Belyta
- Bembidion
- †Bembidium
- †Beris
- Betula
- Bibio
- †Bibiodes
- †Bidessus
- Bison
- †Bison antiquus – or unidentified comparable form
Mounted fossilized skeleton of the Pleistocene Bison latifrons, or long-horned bison
- †Blechnum
- Bledius
- Boletina
- †Borealosuchus
- †Borophagus
- †Brachinus
- †Brachycrus
- Brachylagus
- †Brachyprotoma
- †Brachypsalis
Skeletal reconstruction of the Eocene-Oligocene bear-dog Brachyrhynchocyon - †Brachyspathus – type locality for genus
- Bracon
- †Bruchus
- Bubo
- Bufo
- †Buprestis
- †Bursera
A living Buteo hawk - †Caesalpinia
- †Calcarius
- †Calippus
- †Caliroa
- †Callimoxys
- †Callomyia – tentative report
- Calosoma
- †Calyptapis – type locality for genus
- †Calyptapis florissantensis – type locality for species
Life restoration of the Pliocene-Holocene camel Camelops - Camponotus
- Canis
- †Canis edwardii – or unidentified comparable form
- †Canis latrans
- †Cantius
- †Capnobotes
- †Capsus
A living Carabus ground beetle - †Cardiophorus
- †Cardiospermum
- †Carpocyon
- Carpodacus
- †Carpophilus
- Carya
- Castanea
- †Catopsalis
- †Catopsalis alexanderi – type locality for species
- †Cecidomyia – tentative report
- Cedrela
- †Celastrus
- Celtis
- †Centron – type locality for genus
- †Ceratina
Life restoration of the Paleocene-Eocene crocodilian Ceratosuchus - †Ceratosuchus burdoshi – type locality for species
- †Ceraturgus
- Cercidiphyllum
- Cercis
- †Cercocarpus
- †Cercopis
- Cervus
- Ceutorhynchus
- Chaetodipus
- †Chalcis
- †Chalybion
- †Chamaecyparis
A stand of living Chamaedorea palms - Charina
- †Chauliognathus
- Cheilosia
- †Chelonus
- †Chilocorus
- †Chionaemopsis – type locality for genus
- Chironomus
- Chondestes
- †Chriacus
- †Chrysis
- †Chrysobothris
- †Chrysogaster
- Chrysomela
- †Cicada
- †Cicadella
- †Cimbex
- †Cimexomys
- †Cimexomys arapahoensis – type locality for species
- †Cimexomys minor
A living Cinnamomum, or cinnamon tree - Cissus
- †Cixius – tentative report
- †Cladius
- †Cladura
- †Clastoptera
- †Cleonus
- †Closterocoris
- †Closterocoris elegans – type locality for species
- †Clubiona
- †Clytus
- †Coccinella
- †Coeliodes
- Colaptes
A living Colaptes auratus, or northern flicker
- †Colaspis
- †Collops
- †Colopterus
- †Colubrina
- †Compsemys
- †Coniatus
- Conotelus
- †Conotrachelus
- †Conzattia
- †Copecion
- †Copelemur
- †Copidita
- Corixa
- †Corizus
- †Cormocyon
- †Cormohipparion
- Cornus
- Corticaria
- Corvus
- †Corylus
Life restoration of the Paleocene-Eocene pantodont mammal Coryphodon. Heinrich Harder (1920). - Cossonus
- †Cotinus
- †Crabro
- †Cratacanthus
- Crataegus
- Crotalus
- †Croton
- †Cryptocephalus
- †Cryptocheilus
- Cryptophagus
- Cryptorhynchus
- †Cryptus
A living Culex mosquito - †Curculio
- †Cuterebra
- †Cyclotrachelus
- †Cydamus
- †Cylindrotoma
- †Cynarctoides
- †Cynelos
- Cynomys
- †Cyphomyia
- †Cypris
- †Daphne
- Daphnia
Life restoration of the Eocene-Miocene bear dog Daphoenus - †Davidia
- †Denaeaspis – type locality for genus
- †Denaeaspis chelonopsis – type locality for species
- †Dennstaedtia
- †Dermatobia
- †Dermestes
- †Diabrotica
- †Diacodexis
- †Dialysis
- Diamesa
- †Dianthidium
- †Diceratherium
- †Dicerca
- Dicranomyia
- †Dicranota
- †Dictyla
- †Didymictis
- †Didymosphaeria
- †Dilophodon
Life restoration of the Eocene-Miocene false saber-toothed cat Dinictis. Robert Bruce Horsfall (1913). - †Dinohippus
- †Dioctria
- Dioscorea
- †Diploptera
- Diplotaxis – tentative report
- Diplotaxis
- Dipodomys
- Dipteronia
- †Dissacus
- †Docimus – type locality for genus
- Dodonaea
Preserved Dolichoderus ant - †Dolichoderus antiquus – type locality for species
- †Dolichoderus kohlsi – type locality for species
- †Dolichoderus rohweri – type locality for species
- †Dominickus – type locality for genus
- †Dominickus castnioides – type locality for species
- †Domnina
- Donacia
- Dorytomus
- †Doxocopa
- †Drassonax
Fossilized horns, jaws, and limb bones of the Miocene deer relative Dromomeryx - †Dromomeryx borealis – type locality for species
- †Dryobius
- Dryopteris
- Dyschirius
- †Dysdercus
- †Echmatemys
- †Ectobius
- †Ectocion
- †Ectoconus
- †Elaeomyrmex – type locality for genus
- †Elaeomyrmex coloradensis – type locality for species
- †Elaeomyrmex gracilis – type locality for species
- †Elaphidion
- Elaphropus
- †Elater
- Eleodes
- †Emiliana – type locality for genus
- †Emiliana alexandri – type locality for species
- †Empis
- †Enallagma
- Engelhardtia
- Enochrus
- †Entimus
Life restoration of a pair of the Eocene uintathere mammal Eobasileus. Charles R. Knight (1890s). - †Eocuculus – type locality for genus
- †Eogryllus
- †Eohippus
- †Eosacantha – type locality for genus
- †Eosacantha delocranioides – type locality for species
- †Eotitanops
- Ephedra
- †Ephemera
- †Epicaerus
- Epicauta
- †Epicyon
- †Epihippus
- Epuraea
- †Epyris
- †Equisetum
- Equus
- †Equus conversidens
- †Equus francisci
Restoration of the Pliocene-Holocene horse Equus scotti, or Scott's horse - †Equus simplicidens
- Eremophila
- Erethizon
- Eriocampa
- †Eriophyes – tentative report
- †Eristalis
- †Ernobius
- †Ethmia
- †Eubazus
- †Eucnemis
- †Eucommia
- Eugenia
Fossil of the Eocene ant Eulithomyrmex - †Eulithomyrmex rugosus – type locality for species
- †Eulithomyrmex striatus – type locality for species
- †Euparius
- Euphorbia
- †Eurytoma
- Eutamias
- †Eutamias minimus – or unidentified comparable form
- †Exochus
- Fagus
- Falcipennis
- Falco
- Ficus
Fossilized flower of the Eocene-Oligocene mallow relative Florissantia - †Florissantoraphidia funerata – type locality for species
- Formica
- †Fornax
- †Fraxinus
- †Fulgora
- †Fulica
- †Gaurotes
- †Geocoris
- Geomys
- †Geron – tentative report
- Gerris
- †Gigantocamelus
- †Glossina – type locality for genus
- Glyptostrobus
- Gnophomyia
- †Gomphocerus
Mounted fossilized skeleton of the Miocene-Pleistocene elephant relative Gomphotherium - †Gorytes
- †Grammoptera
- †Gyaclavator – type locality for genus
- †Gyaclavator kohlsi – type locality for species
- †Gymnopternus
- †Gymnorhinus
- †Hadrianus
- Halesia
- †Hapalodectes
- †Haplolambda
- Harpalus
- †Helaletes
- †Helichus
- †Hellwigia
- Helophorus
- †Hemiauchenia
Life restoration of the Eocene tapir relative Heptodon - †Heriades
- †Herpetotherium
- Hersiliola
- †Hesperocyon
- Heterodon
- †Hexerites – type locality for genus
- †Hexerites primalis – type locality for species
- †Heyderia
- Holbrookia
- †Holcorpa – type locality for genus
- †Holcorpa maculosa – type locality for species
- †Homogalax
- †Hoplia
- †Hoplocampa
- †Hoplochelys
- †Humulus
Life restoration of the Eocene-Miocene creodont mammal Hyaenodon - †Hydnobius
- Hydrangea
- Hydriomena
- †Hydriomena? protrita – tentative report
- Hydrobius
- †Hydromystria
- Hydrophilus
- Hydroporus
- Hydropsyche
- †Hydroptila
A living Hygrotus predaceous diving beetle - †Hylobius
- †Hymenophyllum
- †Hyopsodus
- †Hypertragulus
- †Hypisodus
- †Hypohippus
- †Hypolagus
- †Hyporhina
- †Hyporhina galbreathi – type locality for species
- †Hyrachyus
Life restoration of the Eocene-Oligocene odd-toed ungulate Hyracodon. Charles R. Knight (1896). - †Hyracotherium
- †Ichneumon
- Ilex
- †Indusia
- †Iridomyrmex
- †Iridomyrmex florissantius – type locality for species
- †Iridomyrmex obscurans – type locality for species
- †Ischyromys
- †Isomira
- †Isothea – type locality for genus
- †Isotrilophus
- †Iulus
- †Jadera
- †Janus
- Jassus – tentative report. Lapsus calami of Iassus.
- †Judolia
- †Judolia antecurrens – type locality for species
A living Juglans, or walnut tree - Junco
- †Juncus
- †Kalmia
- †Kimbetohia
- Koelreuteria
- †Lacon
- †Lagopus
- †Lambdotherium
- †Lapton
A living Larus gull - Lasiopodomys
- Lasius
- Lathrobium
- Laurus
- †Lebia
- †Leia
- †Lema
- Lemmiscus
- Lepisosteus
- †Leptauchenia
- †Leptis
- †Leptocyon
Life restoration of the Eocene-Oligocene even-toed ungulate Leptomeryx - †Leptomorphus
- Leptophloeus
- †Leptostylus
- †Leptura
- Lepus
- †Leucosticte
- †Leucozona
- †Ligyrocoris
- †Ligyrus
A living Limnephilus caddisfly - †Limnobium
- †Limnophila
- †Limonius
- Lindera
- †Linnaea – type locality for genus
- †Linyphia
- †Liometopum
- †Liometopum miocenicum – type locality for species
- †Liometopum scudderi – type locality for species
- †Lithocharis
Life restoration of the Eocene butterfly Lithodryas - †Lithodryas styx – type locality for species
- †Locusta
- Lomatia
- Longitarsus
- Lontra
- †Lontra canadensis – or unidentified comparable form
- †Lucanus
- †Lycosa
- †Lygaeus
- Lygodium
- Lynx
- Lytta
Life restoration of the Eocene mammal Macrocranion - †Macrodactylus
- †Macrophya
- †Macrorhoptus
- Magdalis
- Magnolia
- Mahonia
- †Maiorana
- †Malachius
- †Malus
- †Mammuthus
Life restoration of a herd of Mammuthus columbi, or Columbian mammoths. The extent of the fur depicted is hypothetical. Charles R. Knight (1909).
- Marmota
- Martes
- †Megacerops
- Megachile
- †Megacyllene
- †Megahippus
- †Megalictis
- †Megapenthes
- †Megatylopus
- †Melanactes
- †Melanophila
- †Melieria
- †Melittomma
- †Mellinus
- Melospiza
- †Meniscotherium
Life restoration of the Miocene rhinoceros Menoceras - Mephitis
- †Merychippus
- †Merychyus
- †Merycochoerus
- †Merycodus
- †Merycoidodon – type locality for genus
- †Mesatirhinus
- †Mesochorus
- †Mesocyon
- †Mesodma
- †Mesohippus
- †Mesoleptus
- †Mesonyx
- †Mesostenus
- Messor
Life restoration of the Eocene pangolin relative Metacheiromys - Metachroma
- †Metarhinus
- Metasequoia
- †Miacis
- Miagrammopes
- †Michenia
- †Microplitis
- †Microsyops
- †Microtomarctus
- Microtus
A living Microtus californicus, or California vole - †Microtus longicaudus
- †Microtus ochrogaster
- †Mimoperadectes
- †Mindarus – type locality for genus
- †Miniochoerus
- †Miodytiscus – type locality for genus
- †Miohippus
- †Miomyrmex
- †Miomyrmex impactus – type locality for species
- †Miomyrmex striatus – type locality for species
Restoration of the Pliocene-Pleistocene Miracinonyx, or American cheetah - †Miracinonyx inexpectatus – or unidentified comparable form
- †Miracinonyx studeri
- †Monosaulax
- Mordella
- †Mordella atrata – or unidentified comparable form
- †Mordella lapidicola – type locality for species
- †Mordella priscula – type locality for species
- †Mordella stygia – type locality for species
- Mordellistena
- †Mordellistena florissantensis – type locality for species
- †Mordellistena nearctica – type locality for species
- †Mordellistena scudderiana – type locality for species
- †Mordellistena smithiana – type locality for species
- †Moropus
- Morus
- Musca
- Mustela
- †Myas
- †Mycetophagus
- Mycetoporus
- Myrica
- Myrmica
- Nebria
- †Nemognatha
- †Neoliotomus
- Neogale
- Neotoma
- †Nepa
- †Nephila
- †Netelia
- †Nicocles
Mounted fossilized skeleton of the Eocene primate Notharctus - Notonecta
- Numenius
- †Numitor – type locality for genus
- †Nyctea
- Nymphaea
- Nysius
- †Nyssa
- Ochotona
- †Odaxosaurus – or unidentified comparable form
- Odocoileus
Living male (right) and female (left) Odocoileus hemionus, or mule deer.
- †Odynerus
- †Oedipoda
- †Ogygoptynx – type locality for genus
- †Oligoaeschna – type locality for genus
- †Oligomerus
- †Oligotricha
- Omalium
- Omus
- Ondatra
- †Oodectes
- Ophisaurus
- Ophryastes
- †Ophyra
- †Opisthotriton
- †Orchelimum
- Orchestes
- Oreamnos – or unidentified comparable form
A living Oreamnos harringtoni, or Harrington's mountain goat
- †Oreopanax
- †Orohippus
- †Orontium
- †Orphilus
- †Orthocentrus
- †Osmanthus
- †Osmunda
- †Otiorhynchus
- Ovis
- †Oxyacodon
Restoration of the Paleocene-Eocene creodont mammal Oxyaena - †Oxycera
- †Oxyomus
- †Pachyaena
- †Paederus
- †Palaeogale
- †Palaeolagus
- †Palaeonictis
- †Palaeosinopa
Restorative model and fossilized skull of the Eocene brontothere mammal Palaeosyops - †Palaeovespa – type locality for genus
- †Palaeovespa florissantia – type locality for species
- †Palaeovespa gillettei – type locality for species
- †Palaeovespa relecta – type locality for species
- †Palaeovespa scudderi – type locality for species
- †Palaeovespa wilsoni – type locality for species
- †Palatobaena
- †Panax
- †Panorpa
- †Paracynarctus
- †Parahippus
- †Parahippus leonensis – or unidentified comparable form
Fossilized skeleton of the Pliocene-Pleistocene ground sloth Paramylodon - †Paramys
- †Parandra
- †Paratylopus
- †Parectypodus
- †Parictis
- †Parthenocissus
- †Passaloecus
- †Patriofelis
- Pediacus
- Pekania
- †Pellea
Fossilized skull of the Eocene-Oligocene lizard Peltosaurus - †Peltosaurus granulosus – type locality for species
- †Pelycodus
- Penthetria – type locality for genus
- †Pepsis
- †Peraceras
- †Peratherium
- Peromyscus
- Persea
Fossil of the Oligocene ant Petraeomyrmex - †Petraeomyrmex minimus – type locality for species
- †Phaca
- Phalacrocorax
- Phalaropus
- †Phasmagyps – type locality for genus
- Pheidole
- †Phenacodus
- Phenacomys
- Philadelphus
- †Philanthus
Illustration of a fossilized skull in multiple views of the Oligocene-Miocene bone-crushing dog Phlaocyon - Phloeosinus
- †Phora
- Phryganea
- Phrynosoma
- †Phylledestes – type locality for genus
- †Phylledestes vorax – type locality for species
- †Phyllobaenus
- Phyllobius
- †Phyllophaga
- †Phymatodes
- Pica
- Picea
- Picoides
- †Pidonia
- †Pimpla
- Pinus
- †Pipiza
- †Pison
- Pituophis
- Platanus
- Plateumaris
- †Platycheirus
- Platydema
Life restoration of a herd of alarmed Miocene-Pleistocene peccaries of the genus Platygonus. Charles R. Knight (1922). - Platynus
- Platystethus
- Plecia
- †Plesiadapis
- †Plesiobaena
- †Pliohippus
- †Plochionus
- †Poabromylus
- Podabrus
- Podiceps
- Podilymbus
Life restoration of the Eocene-Oligocene camel Poebrotherium - †Poecilocapsus
- †Poecilognathus – type locality for genus
- †Pogonomyrmex
- †Pogonomyrmex fossilis – type locality for species
- †Polysphincta
- Populus
- Porzana
- †Potamogeton
- †Praepapilio – type locality for genus
- †Praepapilio colorado – type locality for species
- †Praepapilio gracilis – type locality for species
- †Priabona
- †Pristichampsus
- †Probathyopsis
- †Procas
Illustration of a fossil of the Eocene butterfly Prodryas - †Prodryas persephone – type locality for species
- †Proiridomyrmex – type locality for genus
- †Proiridomyrmex vetulus – type locality for species
- †Prolimnocyon
- †Proscalops
- Prosopis
- †Protazteca – type locality for genus
- †Protazteca capitata – type locality for species
- †Protazteca elongata – type locality for species
- †Protazteca hendersoni – type locality for species
- †Protazteca quadrata – type locality for species
- †Protohippus
- †Protolabis
- †Protomarctus
Protorohippus - †Protostephanus – type locality for genus
- †Protostephanus ashmeadi – type locality for species
- †Protungulatum
- Prunus
- †Psephenus
- Pseudacris
Restoration of the Miocene cat Pseudaelurus - †Pseudhipparion
- Pseudomyrmex
- †Pseudoprotoceras
- †Psittacotherium
- Ptelea
- Pterocarya
- †Pteromalus
- Pterostichus
- †Ptilodus
- †Ptosima
- Quedius
- Quercus
- Rallus
- †Ramoceros
- †Rallus
Life restoration of the Miocene-Pliocene pronghorn Ramoceros and Cosoryx. Robert Bruce Horsfall (1913). - †Rana
- †Raphidia
- Reithrodontomys
- Reticulitermes
- Rhabdomastix
- †Rhagio
- Rhagonycha
- †Rhamnus
- †Rhamphomyia
A living Rhineura floridana, or North American worm lizard - †Rhingia
- Rhizophagus
- Rhus
- †Rhyssa
- †Ribes
- †Robinia
- †Rogas
- Rosa
- †Rothschildia
- Rubus
- Sabal
- †Saccoloma
- Salix
- †Sambucus
Fossilized skeleton of the Eocene monitor lizard Saniwa - †Saperda
- †Saperda florissantensis – type locality for species
- †Sapindus
- †Sapromyza
- Sassafras
- Scaphinotus
- Sceloporus
- Sciara
- †Sciophila
- Sciurus
- Scolytus
- †Segestria
- †Selaginella
- †Semanotus
- Sequoia
Fossilized branch fragment from a Sequoia affinis
- Serica
- †Sespia
- †Sialia
- †Sibinia
- †Sifrhippus
- Sigmodon
- †Silpha
- †Silvius
- †Sinonyx – or unidentified comparable form
- Sitona
- †Sitones
- Sitta
- †Smilax
Mounted fossilized skeleton of the Eocene primate Smilodectes - Sonoma
- Sorex
- †Sparganium
- Spea
- †Spermophagus
- Spermophilus
- †Spermophilus elegans – or unidentified comparable form
- †Spermophilus lateralis
- †Spermophilus richardsonii
- †Spermophilus tridecemlineatus
- †Sphegina
Life restoration of the Eocene brontothere mammal Sphenocoelus - Spilogale
- Spizella
- †Staphylea
- Staphylinus
- †Stenolophus
- †Stenosphenus
- Stenus
- Sterculia
- Stilbus
- †Stipa
- †Strategus
- †Stylinodon
Life restoration of the Eocene-Oligocene cow-sized rhinoceros Subhyracodon. Charles R. Knight (1890s). - Sylvilagus
- †Symphoromyia
- Syrphus
- †Systena
- †Tabanus
- Tachycineta
- Tachyporus
- †Tachys
- Tamiasciurus
- Tapirus
- Taxidea
- †Teilhardina
Restoration of the Miocene-Pliocene rhinoceros Teleoceras - †Tenor – type locality for genus
- †Tenthredo
- †Tetragnatha
- †Tetraonyx
- †Tetraopes
- †Tetraopes submersus – type locality for species
- †Tetrapus
- Thamnophis
A living Thamnophis elegans, or western terrestrial garter snake - †Thamnophis sirtalis
- †Thanasimus
- †Themira
- †Thomisus
- Thomomys
- †Thouinia
- †Thuja
- †Ticholeptus
- Tilia
- †Tingis
- Tipula – type locality for genus
- †Titanoeca
Life restoration of the Paleocene pantodont mammal Titanoides - †Tomarctus
- †Tomarctus brevirostris – type locality for species
- †Tomoxia
- †Tomoxia inundata – type locality for species
- †Torreya
- †Tortricites
- †Tortrix
- †Tortrix florissantana – type locality for species
- †Torymus
- Trechus
- †Trichilia
- †Triga
- †Trigonias
- †Trigonoscuta
- †Triplax
- †Tritemnodon
- †Triumfetta
- †Trixoscelis
- †Trogosus
- Trogoxylon
- †Trogus
- †Tropisternus
- Trox
- †Trypherus
- †Tryphon
- †Tychius
- Typha
- †Uintacyon
- †Uintascorpio – type locality for genus
- Ulmus
- †Ulus
- Urocyon
A living Urocyon cinereoargenteus, or gray fox
- †Ursavus
- Ursus
- †Ustatochoerus
- †Vanessa
- †Vauquelinia
- †Viburnum
- †Vicia
- †Villa – type locality for genus
- Vitis
- †Viverravus
- †Vrilletta
Mounted fossilized skeleton of the Eocene mammal Vulpavus - Vulpes
- †Weinmannia
- †Woodwardia
- †Xantholinus
- †Xestobium
- †Xylocopa
- †Xylomya
- †Xyronomys
- †Yumaceras
- †Zamia
- Zelkova
- Zizyphus
- Zonotrichia
- †Zootermopsis
Known material diagram depicting the Miocene-Pleistocene mastodon relative Zygolophodon with a human to scale
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- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.