List of the Mesozoic life of Wyoming

This list of the Mesozoic life of Wyoming contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Wyoming and are between 252.17 and 66 million years of age.

Illustration of a living Acipenser sturgeon
Restoration of the Cretaceous-Pleistocene amphibian Albanerpeton
Life restoration of the Late Jurassic theropod dinosaur Allosaurus
A living Amia , or bowfin
Restoration of the Late Triassic phytosaur Angistorhinus
Image of restored specimen of a squat quadruped with knobby back
Life restoration of the Late Cretaceous armored dinosaur Ankylosaurus
Life restoration of the Late Jurassic sauropod dinosaur Apatosaurus
Foliage and cones of a living Araucaria tree
Fossilized shells of the Middle Jurassic ammonoid cephalopod Arcticoceras
A living Asplenium , or spleenwort
Illustration of fossilized teeth from the Late Cretaceous tyrannosaur Aublysodon
Fossilized shell of the Late Cretaceous ammonoid cephalopod Baculites
Restoration of the Late Jurassic sauropod dinosaur Barosaurus rearing to defend itself against a pair of the theropod Allosaurus
A living Brachaelurus , or blind shark
Life restoration of a herd of the Late Jurassic sauropod dinosaur Brontosaurus
Life restoration of a herd of the Late Jurassic sauropod dinosaur Camarasaurus
Life restoration of the Late Jurassic ornithopod dinosaur Camptosaurus
Foliage and fruit of a living Celastrus , or staff vine
Restoration of the Late Jurassic ceratosaur Ceratosaurus
Life restoration of the Late Cretaceous-Eocene choristoderan reptile Champsosaurus
Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys
Fossilized foliage of the Permian-Late Cretaceous fern Cladophlebis
Diagram illustrating the known fossil material of the Late Jurassic theropod dinosaur Coelurus
Illustration of fossilized vertebrae of the Late Cretaceous-Eocene snake Coniophis . Othniel Charles Marsh (1892).
Life restoration of the Early Triassic plesiosaur relative Corosaurus
Shell of a Cucullaea , or false ark shell
Life restoration of the Early Cretaceous dromaeosaur ("raptor") Deinonychus
Restoration of the Late Triassic aetosaur Desmatosuchus with an anachronistic human to scale
Life restoration of the Late Cretaceous marsupial relative Didelphodon
Life restoration of the Late Jurassic long-necked dinosaur Diplodocus
Mounted fossilized skeleton of the Late Cretaceous plesiosaur Dolichorhynchops
Life restoration of the Late Cretaceous "raptor" Dromaeosaurus
Life restoration of the Late Cretaceous duck-billed dinosaur Edmontosaurus annectens
Fossilized skeleton of the Eocene-Pliocene frog Eopelobates
Fossilized shell of the Late Cretaceous ammonoid cephalopod Eubostrychoceras
Illustration in multiple views of a fossilized shell of the Late Jurassic-Miocene nautiloid cephalopod Eutrephoceras
Shell of a Fasciolaria , or tulip sea snail
Known material diagram of the Late Jurassic ceratosaur Fosterovenator
Fossilized skull of the Late Jurassic long-necked dinosaur Galeamopus
Fossilized leaf of the Permian-modern tree Ginkgo
Mounted fossilized skeleton of the Middle Jurassic-Late Cretaceous mammal Gobiconodon
Interior and exterior of a fossilized shell of the Late Triassic-Eocene marine bivalve Gryphaea
Life restoration of the Late Jurassic sauropod dinosaur Haplocanthosaurus
Known material diagram of the Middle-Late Triassic distant crocodilian relative Heptasuchus
Life restoration of the Late Triassic rhynchosaur Hyperodapedon
Life restoration of the Late Cretaceous bony fish Ichthyodectes
Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
Fossilized shell of the Permian-modern marine bivalve Isognomon
Fossilized shell of the Late Cretaceous ammonoid cephalopod Jeletzkytes
Diagram illustrating the size of the Late Jurassic long-necked dinosaur Kaatedocus with an anachronistic human to scale
Life restoration of the Late Cretaceous primitive horned dinosaur Leptoceratops
Electron micrograph of fossilized teeth from the Early Jurassic-Early Cretaceous freshwater shark Lissodus
A living Lunatia moon sea snail
Diagram illustrating the known fossil material of two specimens of the Late Jurassic crocodile relative Macelognathus
Life restoration of the Late Jurassic plesiosaur Megalneusaurus
Assemblage of fossilized shells of the Late Cretaceous ammonoid cephalopod Menuites
Life restoration of the Early Cretaceous oviraptorosaur Microvenator
Fossilized shell of the Jurassic-Cretaceous marine bivalve Myophorella
A living Nelumbo lotus
Historical reconstruction of the holotype skeleton from 1921
Interior of a fossilized shell of the Early Ordovician-modern marine bivalve Nucula
A living Odontaspis sand shark
Mounted fossilized skeleton of the Late Jurassic theropod dinosaur Ornitholestes
Mounted fossilized skeleton of the Late Jurassic herbivorous dinosaur Othnielosaurus
Fossilized skeleton of the Late Cretaceous dome-headed dinosaur Pachycephalosaurus
Life restoration of the Late Triassic phytosaur Parasuchus
Micrograph of a fossilized tooth of the Late Cretaceous troodontid Pectinodon
Fossilized shell of the Early Triassic-Pliocene marine bivalve Pholadomya
A live individual of Physa marmorata
Fossilized shell of the Late Cretaceous ammonoid cephalopod Placenticeras
Life restoration of the Late Cretaceous mosasaur Platecarpus
Life restoration of the Late Cretaceous plesiosaur Plesiopleurodon
Restoration of the Late Triassic crocodile relative Poposaurus with an anachronistic human to scale
Fossilized mandible of the Late Cretaceous-Paleocene mammal Protungulatum
Life restoration of the Late Cretaceous pterosaur Pteranodon
A living Quercus , or oak tree
Micrograph with magnified inset of a fossilized tooth of the Late Cretaceous theropod dinosaur Richardoestesia
A living Salix , or willow
Foliage of a living Sassafras tree
Diagram illustrating the Early Cretaceous long-necked dinosaur Sauroposeidon with anachronistic humans to scale
Fossilized shell of the Late Cretaceous ammonoid cephalopod Scaphites
Base of the trunk of a living Sequoia tree with a human to scale
Modern specimen of the marine bivalve Solemya
Fossilized tooth of the Late Cretaceous shark Squalicorax
Restoration of the Late Jurassic stegosaur Stegosaurus
Restoration in multiple views of the Late Jurassic sauropod dinosaur Supersaurus with an anachronistic human to scale
Life restoration of the Late Jurassic theropod dinosaur Tanycolagreus
Life restoration of the Early Cretaceous Iguanodon relative Tenontosaurus
Life restoration of the Late Cretaceous herbivorous dinosaur Thescelosaurus
Illustration of a living Thyrsopteris tree fern
Mounted fossilized skeleton of the Late Jurassic megalosaur Torvosaurus
Mounted fossilized skeleton of the Late Cretaceous horned dinosaur Triceratops
Fossilized skeleton of the Late Cretaceous tyrannosaur Tyrannosaurus
Leaves and fruit of a living Vitis , or grapevine
Living Woodwardia ferns
Life restoration of the Cretaceous bony fish Xiphactinus
Fossil of the Early Triassic-Eocene cycad-like frond Zamites