List of the Mesozoic life of Utah
This list of the Mesozoic life of Utah contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Utah and are between 252.17 and 66 million years of age.
A
- †Abrekopsis
- †Abrekopsis depresispirus – type locality for species
- †Abydosaurus – type locality for genus
- †Abydosaurus mcintoshi – type locality for species
- †Aclistochara
Fossilized skull of the Late Cretaceous duck-billed dinosaur Acristavus - †Adelodelphys
- †Adelolophus – type locality for genus
- †Adelolophus hutchisoni – type locality for species
- †Admetopsis
- †Adocus
- †Aenigmadelphys
- †Aenigmadelphys archeri – type locality for species
Diagram illustrating the sizes of three specimens of the Late Cretaceous long-necked dinosaur Alamosaurus, with an anachronistic human to scale - †Albanerpeton
- †Albanerpeton cifellii – type locality for species
- †Albanerpeton galaktion
- †Albanerpeton gracilis
- †Albanerpeton nexuosus
- †Aletridelphys
- †Allocrioceras
Life restoration of the Late Jurassic theropod dinosaur Allosaurus - †Alphadon
- †Alphadon attaragos
- †Alphadon eatoni – type locality for species
- †Alphadon halleyi
- †Alphadon marshi – or unidentified comparable form
- †Alphadon sahnii
- †Alzadites
- †Amberleya – tentative report
- †Amblotherium
- †Ameribaatar – type locality for genus
- †Ameribaatar zofiae – type locality for species
- †Ameribataar
- Amia
- †Ampezzopleura
- †Ampezzopleura rugosa – type locality for species
- †Amplovalvata
- †Anaflemingites
- †Anaflemingites silberlingi – or unidentified related form
- †Anasibirites
- †Anawasatchites
- †Anchisauripus
- †Anchistodelphys – type locality for genus
- †Anchistodelphys archibaldi – type locality for species
- †Anchistodelphys delicatus – type locality for species
- †Anchura
- †Anemia
Mounted fossilized skeleton of the Cretaceous armored dinosaur Animantarx - †Animantarx ramaljonesi – type locality for species
- †Anisomyon
- Anomia
- †Anomoepus
- †Apatopus
- †Apatosaurus
- †Apatosaurus louisae – type locality for species
- †Apistodon – report made of unidentified related form or using admittedly obsolete nomenclature
- †Apistodon exiguus – or unidentified related form
- †Aquiladelphis – tentative report
- †Aquiladelphis laurae – type locality for species
- †Araeodon
- †Araucariacites
Petrified trunk segments of the Permian-Late Triassic conifer tree Araucarioxylon arizonicum - †Arcomya
- †Arctoceras
- †Arctoprionites
- †Arvinachelys – type locality for genus
- †Arvinachelys goldeni – type locality for species
- †Aspenites
- Astarte
Fossil of the Ordovician-Modern sea star trace fossil ichnogenus Asteriacites - †Astralopteris
- †Astroconodon
- †Astroconodon delicatus – type locality for species
- †Atreipus
- †Aublysodon – tentative report
- †Aucellina
- †Austrotindaria
- †Avitotherium – type locality for genus
- †Avitotherium utahensis – type locality for species
_-_National_Museum_of_Natural_History,_United_States_-_DSC08540.JPG)
B
- †Baena
- †Baibisha – or unidentified comparable form
- †Bajarunia
- †Bajarunia confusionensis – type locality for species
- †Bakevellia
- †Bakevellia costata
- †Bakevellia costatus – or unidentified comparable form
- †Bakevellia exporrecta
- †Bakevellia silberlingi – type locality for species
Life reconstruction of an individual rearing up to defend itself against a pair of Allosaurus - †Basilemys
- †Batrachopus
- †Battenizyga
- †Battenizyga eotriassica – type locality for species
- †Bernissartia
- †Bicuspidon – type locality for genus
- †Bicuspidon numerosus – type locality for species
- †Bicuspidon smikros – type locality for species
- †Borissiakoceras
- †Bothriagenys – type locality for genus
- †Bothriagenys mysterion – type locality for species
Life restoration of the Late Cretaceous plesiosaur Brachauchenius hunting a hesperornithiform bird - †Brachiosaurus
- †Brachychirotherium
- †Brachyphyllum
- †Brasilichnium
- †Brontomerus – type locality for genus
- †Brontomerus mcintoshi – type locality for species
- †Brontopodus
Life restoration of a herd of the Late Jurassic sauropod dinosaur Brontosaurus - †Brownichnus
- †Brownichnus favosites – type locality for species
- †Bryceomys
- †Bryceomys fumosus – type locality for species
- †Bryceomys hadrosus
- †Bryceomys intermedius – type locality for species
C
- †Callialasporites
- Callistina
- †Callistina alta – or unidentified related form
- †Calycoceras
Life restoration of a herd of the Late Jurassic sauropod dinosaur Camarasaurus - †Camarasaurus lentus – type locality for species
- Campeloma
- †Camptonectes
- †Camptosaurus
- †Cantioscyllium – or unidentified comparable form
- †Carmelopodus – type locality for genus
- †Carmelopodus untermannorum – type locality for species
- †Carycorbula
- †Cassiope
- †Cedaromys
- †Cedaromys bestia – type locality for species
- †Cedaromys hutchisoni – or unidentified comparable form
- †Cedaromys minimus – type locality for species
- †Cedaromys parvus – type locality for species
- †Cedarosaurus – type locality for genus
- †Cedarosaurus weiskopfae – type locality for species
- †Cedarpelta – type locality for genus
- †Cedarpelta bilbeyhallorum – type locality for species
- †Cedrorestes – type locality for genus
- †Cedrorestes crichtoni – type locality for species
- †Cedroxylon
- †Ceratodus
Restoration of the Late Jurassic ceratosaur Ceratosaurus - †Cercomya
- †Cerebropollenites
- Cerithiopsis
- †Chamops
- †Characichnos
- †Chartronella
- †Chartronella pagina – type locality for species
- †Chartronella unicostata – type locality for species
Restoration of the Late Triassic coelacanth fish Chinlea - †Chinlea sorenseni – type locality for species
- †Chirotherium
- †Chirotherium rex – or unidentified comparable form
- Chlamys
- †Chondrites
- †Churkites
- †Cimexomys
- †Cimexomys antiquus – or unidentified comparable form
- †Cimexomys gregoryi – type locality for species
- †Cimolodon
- †Cimolodon electus
- †Cimolodon nitidus – or unidentified comparable form
- †Cimolodon similis
- †Cimolodon wardi – type locality for species
Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys - †Cimolomys clarki
- †Cimolomys milliensis – type locality for species
- †Cionichthys – type locality for genus
- †Cionichthys dunklei – type locality for species
- Cladophlebis
- †Claraia
- †Cnodontosaurus – type locality for genus
- †Cnodontosaurus suchockii – type locality for species
- †Coelophysis – tentative report
- †Coelostylina
- †Coelostylina angulifera – or unidentified comparable form
- †Coelostylina costata – type locality for species
- †Coelostylina virginensis – type locality for species
Life restoration of the Late Jurassic primmitive tyrannosaur Coelurus - †Compsemys
- †Confusionella
- †Coniophis
- †Coniopteris
- †Contogenys
- †Contogenys sloani – or unidentified comparable form
- Corbula
- †Cordillerites
- †Corviconodon
- †Corviconodon utahensis – type locality for species
- Cossmannea
- †Costatoria
- †Cowboyiceras – type locality for genus
- †Cowboyiceras farwestense – type locality for species
- †Cretorectolobus
- †Crittendenia
- †Ctenacodon
- †Cteniogenys
- †Ctenostreon
- †Ctenostreon gikshanensis – or unidentified comparable form
- Cucullaea
- †Culicolestes – type locality for genus
- †Culicolestes kielanae – type locality for species
Fossil of the Jurassic-Cretaceous cycad relative Cycadeoidea - Cylichna
- †Cylindrobullina
- †Cylindrobullina convexa – type locality for species
- †Cymbophora
- †Cynepteris
- †Cypellospongia – type locality for genus
- †Cypellospongia fimbriartis – type locality for species
- †Czekanowskia
- †Czekanowskia turneri – type locality for species
D
- †Dakotadens – type locality for genus
- †Dakotadens morrowi – type locality for species
- †Dakotadens pertritus – type locality for species
- †Dakotamys
- †Dakotamys malcolmi – type locality for species
- †Dakotaseps – type locality for genus
- †Dakotaseps gillettorum – type locality for species
- †Dakotasuchus
- †Deinonychus
- †Denazinemys
- Dentalium
- †Dentalium sublineatum – or unidentified related form
Restoration of the Late Cretaceous horned dinosaur Diabloceratops - †Diabloceratops eatoni – type locality for species
- †Dicothodon – type locality for genus
- †Dicothodon cifelli
- †Dicothodon cifellii – type locality for species
- †Dicothodon moorensis – type locality for species
- †Dieneroceras
- †Dimekodontosaurus – type locality for genus
- †Dimekodontosaurus madseni – type locality for species
- †Dinehichnus – type locality for genus
- †Dinehichnus socialis – type locality for species
- †Dinochelys – type locality for genus
- †Dinochelys whitei – type locality for species
- †Dinophyton
- †Dinosauropodes – type locality for genus
- †Dinosauropodes bransfordii
- †Dinosauropodes magrawii – type locality for species
- †Dinosauropodes osborni
- †Dinosauropodes wilsoni
- †Diplochilus – tentative report
Life restoration of the Late Jurassic long-necked dinosaur Diplodocus - Discinisca – report made of unidentified related form or using admittedly obsolete nomenclature
- †Docodon
- †Dolichorhynchops
- †Dolichorhynchops tropicensis – type locality for species
- †Doswellia
- †Drepanocheilus
- †Dryolestes
- †Dryosaurus
- †Dystrophaeus – type locality for genus
- †Dystrophaeus viaemalae – type locality for species
E
- †Elegantinia
- Elliptio
Restoration of the Early Cretaceous-Eocene bony fish Enchodus, or the "saber-toothed herring" - †Enneabatrachus
- †Entalophora
- †Entolioides
- †Entolium
- †Entradasuchus – type locality for genus
- †Entradasuchus spinosus – type locality for species
- †Eoalphadon
- †Eoalphadon clemensi – type locality for species
- †Eoalphadon lillegraveni – type locality for species
- †Eoalphadon woodburnei – type locality for species
- †Eocephalites
- †Eodelphis
- †Eoginkgoites
Illustration of a reconstructed skull and restorative portrait of the Late Cretaceous primitive duck-billed dinosaur Eolambia - †Eolambia caroljonesa – type locality for species
- †Eopolycotylus – type locality for genus
- †Eopolycotylus rankini – type locality for species
- †Equisetites
- †Equisetum
- †Equisetum burchardtii
- †Equisetum UD006 – informal
- †Eryma
- †Eucalyptus
- †Eumorphotis
- †Eumorphotis beneckei – or unidentified comparable form
- †Eumorphotis ericius – type locality for species
- †Eumorphotis hinnitidea
- †Eumorphotis multiformis
- †Eumorphotis venetiana
- †Eumorphotis virginensis – type locality for species
- †Eunaticina
- †Euomphaloceras
- †Euspira
- †Euthlastus
- †Eutretauranosuchus
- †Evazoum
- †Exesipollenites
Fossilized shell of the Jurassic-Cretaceous foam oyster Exogyra - †Exostinus – or unidentified comparable form
F
- †Fabrosaurus – tentative report
Fossilized skeleton of the Early Cretaceous therizinossaur Falcarius - †Falcarius utahensis – type locality for species
- Ficus
- †Flemingites
- †Frenelopsis
G
Mounted fossilized skeletons of the Early Cretaceous armored dinosaur Gastonia - †Gastonia burgei – type locality for species
- †Geltena
- †Geminiraptor
- †Germanonautilus – tentative report
- †Gervillaria
- †Gervillia
- Gleichenia
- †Glirodon – type locality for genus
- †Glirodon grandis – type locality for species
- Globularia – tentative report
- †Glyptops
- †Glyptops plicatulus – type locality for species
- †Gondolella
- †Goniobasis – tentative report
- †Goniodiscus
- †Goniomya
Restoration of the Late Jurassic-Early Cretaceous crocodile relative Goniopholis - †Grallator
- †Grammatodon
- †Gryphaea
- †Gryphaeostrea
Mounted fossilized skeleton of the Late Cretaceous duck-billed dinosaur Gryposaurus - †Gryposaurus monumentensis – type locality for species
- †Guodunites
- †Gwyneddichnium
- †Gypsonictops
H
Life restoration of the Late Cretaceous oviraptorosaur Hagryphus - †Hagryphus giganteus – type locality for species
- †Hamulus – tentative report
- †Hanielites
- †Harmodontosaurus – type locality for genus
- †Harmodontosaurus emeryensis – type locality for species
- †Hausmania
- †Hedenstroemia
- Hemiaster
- †Hemicalypterus – type locality for genus
- †Hemicalypterus weiri – type locality for species
- †Heminajas – tentative report
- †Heminajas balatonis – or unidentified comparable form
- †Hemiprionites
Life restoration of the Early Cretaceous Iguanodon relative Hippodraco - †Hippodraco scutodens – type locality for species
- †Hispanosauropus
- †Hoernesia
- †Holocrinus
- †Holocrinus dubius – tentative report
- †Holocrinus smithi
- †Homalopoma
- †Homalopoma sinbadensis – type locality for species
- †Homomya
- †Hoplitosaurus – or unidentified comparable form
- †Hoplosuchus – type locality for genus
- †Hoplosuchus kayi – type locality for species
Restoration of two of the Permian-Late Cretaceous cartilaginous fish Hybodus - †Hyporosopora
- †Hyporosopora nielsoni – type locality for species
I
- †Icacinoxylon
- †Icacinoxylon pittiense – type locality for species
- †Idahocolumbites
Life restoration of the Early Cretaceous Iguanodon relative Iguanacolossus - †Iguanacolossus fortis – type locality for species
- †Iguanodon
- †Iguanodon ottingeri – type locality for species
- Ilex
Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size - †Inoceramus albertensis – or unidentified comparable form
- †Inoceramus flavus
- †Inoceramus gilberti
- †Inoceramus koeneni
- †Inoceramus pictus
- †Inoceramus tenuistriatus – tentative report
- †Inoceramus undabundus
- †Inyoites
- †Inyoites beaverensis – type locality for species
- †Inyoites oweni
- †Iqualadelphis
- †Iridotriton – type locality for genus
- †Iridotriton hechti – type locality for species
- †Ischyrhiza – or unidentified comparable form
- Isocrinus
Fossilized shell of the Permian-modern marine bivalve Isognomon - †Isognomon perplana – or unidentified comparable form
- †Iugomortiferum – type locality for genus
- †Iugomortiferum thoringtoni – type locality for species
J
- †Janumys – type locality for genus
- †Janumys erebos – type locality for species
- †Janumys erebros
- †Jeanbesseiceras
- †Jugulator
- †Juvenites
- †Juvenites spathi – or unidentified related form
- †Juvenites thermarum – or unidentified comparable form
K
Fossilized shells of the Jurassic brachiopod Kallirhynchia - †Kallirhynchia myrina – type locality for species
- †Kamerunoceras
- †Kashmirites
- †Kashmirites confusionensis
- †Kashmirites meeki
- †Kashmirites nivalis
- †Kashmirites perrini
- †Kashmirites seerleyi
- †Kashmirites stepheni – type locality for species
- †Kashmirites subarmatus
- †Kashmirites utahensis – type locality for species
- †Kayentapus
- †Kokopellia – type locality for genus
- †Kokopellia juddi – type locality for species
- †Koparion – type locality for genus
- †Koparion douglassi – type locality for species
- †Koreanaornis
- †Koreanaornis hamanensis – or unidentified comparable form
Life restoration of the Late Cretaceous horned dinosaur Kosmoceratops - †Kosmoceratops richardsoni – type locality for species
- †Kouphichnium
L
- †Ladinaticella
- †Lanceolites
- †Lasalichthys – type locality for genus
- †Lasalichthys hillsi – type locality for species
- †Latochara
- †Laubopsis – tentative report
- †Legumen
Fossilized skull of the Late Cretaceous alligator relative Leidyosuchus - †Lenticidaris – type locality for genus
- †Lenticidaris utahensis – type locality for species
- †Lepidotes
- †Lepidotes walcotti – type locality for species
- Lepisosteus
- †Leptalestes
- †Leptochamops
- †Leptochondria
- †Leptochondria curtocardinalis
- †Leptochondria nuetzeli – type locality for species
- †Leptochondria occidanea – type locality for species
- †Leptochondria xijinwulanensis
- Lima
- †Lingularia
- †Liopistha
- †Liostrea
- †Liriophyllum
- †Liriophyllum UD012 – informal
- †Lissodus
- †Litakis
- †Lonchidion
- Lopha
- †Lopha engelmanni – or unidentified related form
- Lucina
- †Lyosoma
Life restoration of the Late Cretaceous tyrannosaur Lythronax - †Lythronax argestes – type locality for species
M
Life restoration of the Late Cretaceous horned dinosaur Machairoceratops - †Machairoceratops cronusi – type locality for species
- †Macroelongatoolithus
- †Macroelongatoolithus carlylei – type locality for species
- †Mactromya – tentative report
- †Magadiceramus
- Magnolia
- †Mammites
Life restoration of the Late Jurassic megalosaur Marshosaurus - †Marshosaurus bicentesimus – type locality for species
- †Martharaptor – type locality for genus
- †Martharaptor greenriverensis – type locality for species
- †Matonidium
- †Meekoceras
- †Meekoceras davisi
- †Meekoceras gracilitatis
- †Meekoceras millardense – type locality for species
- †Meekoceras olivieri – type locality for species
- †Megalosauripus
- †Megasphaeroceras
- †Megasphaeroceras rotundum – or unidentified comparable form
- †Melvius
- †Melvius chauliodous – or unidentified comparable form
Fossilized skull of the Late Cretaceous multituberculate mammal Meniscoessus - †Meniscognathus
- †Meniscognathus altmani – or unidentified comparable form
- †Meniscognathus molybrochoros – type locality for species
- †Mesembrioxylon
- †Mesembryoxylon
- †Mesodma
- †Mesodma formosa – or unidentified comparable form
- †Mesodma hensleighi – or unidentified comparable form
- †Mesodma minor – or unidentified comparable form
- †Mesodma thompsoni – or unidentified comparable form
- †Mesostoma
- †Metoicoceras
- †Microcachrydites
- †Microconchus
- †Microeciella
- †Microeciella duoflavina
- †Microeciella pollostos – type locality for species
- †Minersvillites – type locality for genus
- †Minersvillites farai – type locality for species
- †Miocidaris
Mounted fossilized skeletons of the Early Cretaceous long-necked dinosaur Moabosaurus - †Moabosaurus utahensis – type locality for species
- Modiolus
- †Monanthesia
- †Monocnemodon – type locality for genus
- †Monocnemodon syphakos – type locality for species
- †Moros – type locality for genus[1]
- †Moros intrepidus – type locality for species[2]
- †Myalina
- †Myledaphus
- †Myoconcha
- †Myoconcha plana – or unidentified comparable form
- †Myopholas
Fossilized shell of the Jurassic-Cretaceous marine bivalve Myophorella - †Myophoria
- †Mytiloides
- †Mytiloides submytiloides – or unidentified related form
- †Mytilus
- †Mytilus whitei – or unidentified comparable form
N
- †Naomichelys
Known material diagram of the Late Cretaceous horned dinosaur Nasutoceratops - †Nasutoceratops titusi – type locality for species
- †Naticopsis
- †Naticopsis depressispira
- †Naticopsis fenestravella – type locality for species
- †Naticopsis utahensis – type locality for species
- †Natiria
- †Natiria aequicostata – type locality for species
- †Natiria costata – or unidentified comparable form
- †Nedcolbertia – type locality for genus
- †Nedcolbertia justinhoffmanni – type locality for species
- †Nemodon
- †Neocardioceras
- †Neocrioceras
- †Neoschizodus
- †Neoschizodus laevigatus
- †Neoschizodus orbicularis – or unidentified comparable form
- †Neoschizodus praeorbicularis
- †Neoschizodus thaynesianus – type locality for species
- †Neridomus – tentative report
Fossilized shell of the Jurassic-Cretaceous sea snail Nerinea - †Neritaria
- †Neritaria costata – type locality for species
- Neritina
- †Neurankylus
- †Nezpercius
- †Nilsonia
- †Nilsonia lewisii – type locality for species
- †Nilssoniopteris
- †Nododelphinula – tentative report
- †Normannites – tentative report
- †Normannites crickmayi – or unidentified related form
Mounted fossilized skeleton of the Late Cretaceous Nothronychus - †Nothronychus graffami – type locality for species
- Nucula
- Nuculana
- †Nuculana mutuata – or unidentified comparable form
- †Nymphalucina
- †Nymphalucina linearia – or unidentified related form
O
- †Obnixia – type locality for genus
- †Odaxosaurus
- †Odaxosaurus piger – or unidentified comparable form
- †Odaxosaurus priscus
- †Odaxosaurus roosevelti – type locality for species
- †Omphaloptycha
- †Omphaloptycha hormolira – type locality for species
- †Omphaloptychia
- †Omphaloptychia laevisphaera – type locality for species
- Oncousoecia – tentative report
- †Ooliticia – tentative report
- †Ophioglypha
- †Ophioglypha utahensis – type locality for species
- †Opisthias
- †Ornithomimus
- †Osteocallis
- Ostrea
Mounted fossilized skeleton of the Late Jurassic herbivorous dinosaur Othnielosaurus - †Otozoum
- †Ovaloolithus
- †Ovaloolithus tenuisus – type locality for species
- †Ovaloolithus utahensis – type locality for species
- †Owenites
P
- †Pachyomphalus
- †Pachyomphalus americanus – type locality for species
Fossilized foliage of the Carboniferous-Late Cretaceous plant Pagiophyllum - †Paiutemys – type locality for genus
- †Paiutemys tibert – type locality for species
- †Palaeophycus – or unidentified comparable form
- †Palaeopiceoxylon
- †Palaeoscincosaurus
- †Palaeoscincosaurus pharkidodon – type locality for species
- †Paleoaster
- †Palmulasaurus – type locality for genus
- †Palmulasaurus quadratus – type locality for species
- †Parachondroceras
- †Parachondroceras andrewsi
- †Parachondroceras filicostatum – or unidentified comparable form
- †Paracimexomys
- †Paracimexomys judithae – or unidentified comparable form
- †Paracimexomys magnus
- †Paracimexomys perplexus – type locality for species
- †Paracimexomys priscus – or unidentified comparable form
- †Paracimexomys robisoni – type locality for species
- †Paraglyphanodon – type locality for genus
- †Paraglyphanodon gazini – type locality for species
- †Paraglyphanodon utahensis – type locality for species
- †Parallelodon – tentative report
- †Parallelodon beyrichii – or unidentified related form
- †Paramacellodus
- †Paramacellodus oweni – or unidentified comparable form
- †Paranyctoides
- †Paraphyllanthoxylon
- †Parasaniwa
- †Parasaniwa cynochoros – type locality for species
- †Parasaniwa wyomingensis – or unidentified comparable form
Life restoration of the Late Cretaceous duck-billed dinosaur Parasaurolophus being preyed upon by the tyrannosaur Teratophoneus - †Pariadens
- †Pariadens kirklandi – type locality for species
- †Pariadens mckennai – type locality for species
- †Parmicorbula
- †Paronychodon – or unidentified comparable form
- †Parotosuchus
- †Parotosuchus nov. spec. – informal
- †Parussuria
- †Patulopora
- †Paullia
- †Pediomys – report made of unidentified related form or using admittedly obsolete nomenclature
- †Pegmavalvula
- †Pelecypodichnus
- †Peloroplites – type locality for genus
- †Peloroplites cedrimontanus – type locality for species
- †Peneteius – type locality for genus
- †Peneteius saueri – type locality for species
- †Pentasauropus
- †Periallus
- †Perissoptera
- †Permophorus
- †Permophorus bregeri – or unidentified comparable form
- †Permophorus triassicus
- †Pernopecten
- †Phelopteria
- †Phelopteria minuta – or unidentified comparable form
- †Phlebopteris
Fossilized shell of the Early Triassic-Pliocene marine bivalve Pholadomya - †Piarorhynchella
- †Picopsis
- †Pinacosuchus – type locality for genus
- †Pinacosuchus mantiensis – type locality for species
- Pinna
- †Pistia – report made of unidentified related form or using admittedly obsolete nomenclature
- †Pityoxylon
Fossilized shell of the Late Cretaceous ammonoid cephalopod Placenticeras - Placopsilina
- †Plagioglypta
- †Plagiostoma
- †Planicoxa – type locality for genus
- †Planicoxa venenica – type locality for species
- †Planolites
- †Plataninium
- †Plesiopinna
- †Pleuromya
- †Pleuromya musculoides – or unidentified comparable form
- †Pleuromya prima – type locality for species
- †Pleuromya subcompressa
- †Pleuronautilus
- †Pleuronectites
- Pleurotomaria – tentative report
- Plicatula
- †Plicatula ferryi – or unidentified comparable form
- †Podozamites
- †Polyacrodus – tentative report
- †Polyglyphanodon – type locality for genus
- †Polyglyphanodon sternbergi – type locality for species
- †Polygyrina
Restoration of the Late Triassic crocodile relative Poposaurus with an anachronistic human to scale - †Preflorianites
- †Preprismatoolithus
- †Priacodon
- †Primaderma – type locality for genus
- †Primaderma nessovi – type locality for species
- †Prismatoolithus
- †Prismatoolithus jenseni – type locality for species
- †Procerithium – tentative report
- †Promathildia
- †Promathildia spirocostata – type locality for species
- †Promyalina
- †Promysidiella
- †Pronoella
- †Pronoella cinnabarensis – or unidentified comparable form
- †Pronoella uintahensis
- †Proplacenticeras
- †Prorokia
- †Protalphadon
- †Protocardia
- †Protogusarella
- †Protopis
- †Protopis waageni – or unidentified related form
- †Protovirgularia
- †Psalandon – tentative report
- †Pseudaspidoceras
- †Pseudocalycoceras
- †Pseudocorbula
- †Pseudohypolophus
Fossilized shell of a Pseudomelania sea snail - †Pseudomyoconcha – tentative report
- †Pseudoptera
- †Pseudosageceras
- †Pseudosaurillus – or unidentified comparable form
- †Pseudotetrasauropus
- †Pseudotritonium
- †Pseudotritonium sciaphosterum – type locality for species
- †Psilomya
- †Psilomya concentrica – or unidentified related form
- †Psilomya elongata – or unidentified related form
- †Pteraichnus
- †Pteraichnus saltwashensis – or unidentified comparable form
- †Pteraichnus stokesi – or unidentified comparable form
- †Ptychotrigon
Assemblage of fossilized shells of the Cretaceous-Pleistocene oyster Pycnodonte
.jpg)
Q
- †Quenstedtia
- †Quenstedtia bathonica – or unidentified related form
R
- †Radioceras
- †Radioceras evolvens – or unidentified related form
Fossilized skeleton of the Late Triassic phytosaur Redondasaurus - Rhabdocolpus
- †Rhadinosteus – type locality for genus
- †Rhadinosteus parvus – type locality for species
- †Rhynchonella – report made of unidentified related form or using admittedly obsolete nomenclature
- †Rhynchosauroides
- †Rhynchostreon
Micrograph with magnified inset of a fossilized tooth of the Late Cretaceous theropod dinosaur Richardoestesia - †Richardoestesia isosceles – or unidentified comparable form
- Rogerella
- †Rotodactylus
- †Rotodactylus cursorius – type locality for species
S
- †Sabalites
- †Sabalites NE008 – informal
- Salix
Life restoration of the Early Cretaceous armored dinosaurs Sauropelta - †Scapherpeton
- †Schillerosaurus – type locality for genus
- †Schillerosaurus utahensis – type locality for species
- †Sciponoceras
- †Scotiophryne
- †Scoyenia
Known material diagram of the Early Jurassic primitive long-necked dinosaur Seitaad - †Seitaad ruessi – type locality for species
- †Sementiconcha – type locality for genus
- †Sementiconcha recuperator – type locality for species
- †Semionotus
- †Semionotus kanabensis – type locality for species
- Serpula
- †Sexta
- †Sexta navicula – or unidentified related form
Life restoration of the Late Cretaceous theropod dinosaur Siats - †Siats meekerorum – type locality for species
- †Simplicidium
- †Sinbadelphys
- †Sinbadiella – type locality for genus
- †Sinbadiella pygmaea – type locality for species
- †Skolithos
- †Sohlites
- Solemya
- †Soleniscus
- †Spalacolestes
- †Spalacolestes cretulablatta
- †Spalacolestes inconcinnus – type locality for species
- †Spalacotheridium – type locality for genus
- †Spalacotheridium mckennai – type locality for species
- †Spalacotheridium noblei
Fossils of the dinosaur egg oogenus Spheroolithus - †Spheruprismatoolithus – type locality for genus
- †Spheruprismatoolithus condensis
- †Spheruprismatoolithus condensus – type locality for species
- Spirorbis – report made of unidentified related form or using admittedly obsolete nomenclature
- †Spirorbis valvata – or unidentified comparable form
- †Spongioolithus – type locality for genus
- †Spongioolithus hirschi – type locality for species
- †Squatirhina
- †Stagonolepis
- †Stegopodus – type locality for genus
- †Stegopodus czerkasi – type locality for species
Restoration of the Late Jurassic stegosaur Stegosaurus - †Stegosaurus stenops – or unidentified comparable form
- †Stegosaurus ungulatus
- †Stellatochara
- †Stemmatoceras
- †Stemmatoceras albertense – or unidentified related form
- †Stemmatoceras arcicostum
- †Stephanoceras
- †Stephanoceras nodosum – or unidentified related form
Life restoration of the primitive tyrannosaur Stokesosaurus - †Stokesosaurus clevelandi – type locality for species
- Stomatopora
- †Stomohamites
- †Strobeus
- †Submeekoceras
- †Symmetrocapulus – tentative report
- †Symmetrodontoides
- †Symmetrodontoides foxi – type locality for species
- †Symmetrodontoides oligodontos – type locality for species
- †Syncyclonema
- †Synorichthys
T
Known material diagram of the Late Cretaceous troodontid Talos - †Talos sampsoni – type locality for species
- †Tancredia – tentative report
- †Tanycolagreus
- †Teinostomopsis – tentative report
- †Tempskya
- †Tempskya jonesii – type locality for species
- †Tempskya knowltoni
- †Tempskya minor
- †Tempskya superba
- †Tempskya whiteheadi – type locality for species
- †Tenontosaurus
Known material diagram of the Late Cretaceous tyrannosaur Teratophoneus - †Teratophoneus curriei – type locality for species
- Teredolites
- †Tethyaster
- †Tethyaster jurassicus – type locality for species
- †Tetrasauropus
- †Thalassinoides
- †Therangopodus – tentative report
- †Therangospodus – type locality for genus
- †Therangospodus pandemicus – type locality for species
- †Theretairus
- †Thescelus
- Thracia
- †Tirolites
- †Tirolites carniolicus – tentative report
- †Tirolites smithi – or unidentified related form
Mounted fossilized skeleton of the Late Jurassic megalosaur Torvosaurus - †Toxolophosaurus – or unidentified comparable form
- †Trachodon
- †Torosaurus
- †Triconolestes – type locality for genus
- †Triconolestes curvicuspis – type locality for species
- †Trigonia
- †Trigonodus
- †Trigonodus orientalis – or unidentified comparable form
- †Trigonodus sandbergeri – or unidentified comparable form
- †Trigonodus sandbergi – or unidentified comparable form
Fossilized skeleton of the Late Cretaceous polycotylid plesiosaur Trinacromerum - †Trinacromerum bentonianum – tentative report
- †Tripennaculus – type locality for genus
- †Tripennaculus eatoni – type locality for species
- †Trisauropodiscus
- †Trisauropodiscus moabensis – type locality for species
- Trochocyathus
- †Trochosmilia
- †Trochosmilia moorei – type locality for species
- †Tulotomops
- †Turgidodon – type locality for genus
- †Turgidodon lillegraveni – type locality for species
- †Turgidodon madseni – type locality for species
- †Turgidodon russelli – or unidentified comparable form
- Turritella
- †Tylostoma – tentative report
Fossil of the Late Cretaceous tyrannosaur footprint ichnogenus Tyrannosauripus - †Tyrannosauripus petersoni – type locality for species
U
- †Undichnia
- †Unicardium
- †Unionites
- †Unionites borealis – or unidentified comparable form
- †Unionites fassaensis
- †Ussurites
- †Utahceratops – type locality for genus
- †Utahceratops gettyi – type locality for species
- †Utahgenys – type locality for genus
- †Utahgenys antongai – type locality for species
- †Utahgenys evansi – type locality for species
Diagram illustrating the Early Cretaceous dromaeosaurid ("raptor") Utahraptor with an anachronistic human to scale - †Utahraptor ostrommaysi – type locality for species
- †Uteodon
V
- Valvata
Life restoration of the Late Triassic reptile Vancleavea - †Varalphadon – type locality for genus
- †Varalphadon crebreforme – type locality for species
- †Varalphadon wahweapensis – type locality for species
- †Vaugonia
- †Venenosaurus – type locality for genus
- †Venenosaurus dicrocei – type locality for species
- †Vercherites
- †Vercherites undulatus – type locality for species
- †Vex
Shell of a Viviparus freshwater snail
W
- †Wailiceras
- †Wailiceras aemulus – or unidentified comparable form
- †Wasatchites
- †Webbsaurus – type locality for genus
- †Webbsaurus lofgreni – type locality for species
- †Worthenia
- †Worthenia windowblindensis – type locality for species
- †Wortheniella
- †Wortheniella canalifera – or unidentified comparable form
- †Worthoceras
- †Wyomingites
- †Wyomingites aplanatus – or unidentified comparable form
X
- †Xenoceltites
- †Xiaoqiaoceras – tentative report
- †Xiaoqiaoceras americanum – type locality for species
Y
Life restoration of the Early Cretaceous dromaeosaurid ("raptor") Yurgovuchia - †Yurgovuchia doellingi – type locality for species
Z
Fossil of the Early Triassic-Eocene cycad-like frond Zamites - †Zamites powelli
- †Zamites tidwellii – type locality for species
- †Zygiocuspis – type locality for genus
- †Zygiocuspis goldingi – type locality for species
- †Zygopleura
- †Zygopleura haasi – type locality for species
References
- ^ Lindsay E. Zanno; Ryan T. Tucker; Aurore Canoville; Haviv M. Avrahami; Terry A. Gates; Peter J. Makovicky (2019). "Diminutive fleet-footed tyrannosauroid narrows the 70-million-year gap in the North American fossil record". Communications Biology. 2: Article number 64. doi:10.1038/s42003-019-0308-7. PMC 6385174. PMID 30820466.
- ^ Lindsay E. Zanno; Ryan T. Tucker; Aurore Canoville; Haviv M. Avrahami; Terry A. Gates; Peter J. Makovicky (2019). "Diminutive fleet-footed tyrannosauroid narrows the 70-million-year gap in the North American fossil record". Communications Biology. 2: Article number 64. doi:10.1038/s42003-019-0308-7. PMC 6385174. PMID 30820466.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
