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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{{Compact ToC}}- †Abrekopsis
- †Abrekopsis depresispirus – type locality for species
- †Abydosaurus – type locality for genus
- †Abydosaurus mcintoshi – type locality for species
- †Aclistochara
- †Acristavus
- †Adelodelphys
- †Adelolophus – type locality for genus
- †Adelolophus hutchisoni – type locality for species
- †Admetopsis
- †Adocus
- †Aenigmadelphys
- †Aenigmadelphys archeri – type locality for species
- {{multiple image
| total_width = 248 | image1 = Alamosaurus Scale Chart Steveoc.svg | alt1 = | image2 = Albanerpeton BW.jpg | alt2 = | footer = Left: Diagram illustrating the sizes of three specimens of the Late Cretaceous long-necked dinosaur Alamosaurus, with an anachronistic human to scale. Right: Life restoration of the Cretaceous-Pleistocene amphibian Albanerpeton.}} †Alamosaurus - †Alamosaurus sanjuanensis
- †Albanerpeton
- †Albanerpeton cifellii – type locality for species
- †Albanerpeton galaktion
- †Albanerpeton gracilis
- †Albanerpeton nexuosus
- †Aletridelphys
- †Allocrioceras
- {{multiple image
| total_width = 248 | image1 = Allosaurus Revised.jpg | alt1 = | image2 = Alphadon sp. - MUSE.jpg | alt2 = | footer = Left: Life restoration of the Late Jurassic theropod dinosaur Allosaurus. Right: Restorative model of the Late Cretaceous mammal Alphadon.}} †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
- †Anasibirites angulosus
- †Anasibirites bastini
- †Anasibirites hircinus
- †Anasibirites kingianus
- †Anasibirites mojsisovicsi
- †Anasibirites multiformis
- †Anasibirites tenuistriatus
- †Anawasatchites
- †Anchisauripus
- †Anchistodelphys – type locality for genus
- †Anchistodelphys archibaldi – type locality for species
- †Anchistodelphys delicatus – type locality for species
- †Anchura
- †Anemia
- †Anemia dakotensis
- †Anemia dicksoniana
- †Anemia fremontii
- {{multiple image
| total_width = 248 | image1 = Animantarx.jpg | alt1 = | image2 = Apatosaurus louisae by durbed.jpg | alt2 = | footer = Left: Mounted fossilized skeleton of the Cretaceous armored dinosaur Animantarx. Right: Life restoration of the Late Jurassic sauropod dinosaur Apatosaurus.}} †Animantarx – type locality for genus - †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
- †Araucariacites australis
- †Araucariacites fissus
- †Araucarioxylon
- †Arcomya
- †Arctoceras
- †Arctoprionites
- †Arvinachelys – type locality for genus
- †Arvinachelys goldeni – type locality for species
- †Aspenites
- Astarte
- †Astarte livingstonensis
- †Astarte meeki
- Asteriacites
- †Asteriacites lumbricalis
- †Astralopteris
- †Astralopteris coloradica
- †Astroconodon
- †Astroconodon delicatus – type locality for species
- †Atreipus
- †Aublysodon – tentative report
- †Aucellina
- †Austrotindaria
- †Austrotindaria canalensis
- †Austrotindaria svalbardensis
- †Avitotherium – type locality for genus
- †Avitotherium utahensis – type locality for species
B{{Compact ToC}}- †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
- †Barosaurus
- †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
- {{multiple image
| total_width = 330 | image1 = Brachauchenius lucasi2DB.jpg | alt1 = | image2 = Brachiosaurus scale.png | alt2 = | image3 = Brontomerus Utahraptor.jpeg | alt3 = | footer = Left: Life restoration of the Late Cretaceous plesiosaur Brachauchenius hunting a hesperornithiform bird. Middle: Diagram illustrating the Late Jurassic sauropod dinosaur Brachiosaurus with an anachronistic human to scale. Right: Reconstruction of Brontomerus using its strong femoral protraction muscles to deliver a kick to a Utahraptor.}} †Brachauchenius - †Brachiosaurus
- †Brachychirotherium
- †Brachychirotherium thuringiacum
- †Brachyphyllum
- †Brachyphyllum crassicaule
- †Brasilichnium
- †Brontomerus – type locality for genus
- †Brontomerus mcintoshi – type locality for species
- †Brontopodus
- †Brontosaurus
- †Brownichnus
- †Brownichnus favosites – type locality for species
- †Bryceomys
- †Bryceomys fumosus – type locality for species
- †Bryceomys hadrosus
- †Bryceomys intermedius – type locality for species
C{{Compact ToC}}- †Callialasporites
- †Callialasporites segmentatus
- †Callialasporites turbatus
- Callistina
- †Callistina alta – or unidentified related form
- †Calycoceras
- {{multiple image
| total_width = 248 | image1 = Camarasaurs1.jpg | alt1 = | image2 = Camptosaurus.jpg | alt2 = | footer = Left: Life restoration of a herd of the Late Jurassic sauropod dinosaur Camarasaurus. Right: Life restoration of the Late Jurassic ornithopod dinosaur Camptosaurus.}} †Camarasaurus – type locality for genus - †Camarasaurus lentus – type locality for species
- Campeloma
- †Camptonectes
- †Camptonectes platessiformis
- †Camptonectes stygius
- †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
- †Ceratosaurus
- †Cercomya
- †Cerebropollenites
- †Cerebropollenites macroverruesus
- Cerithiopsis
- †Chamops
- †Characichnos
- †Chartronella
- †Chartronella pagina – type locality for species
- †Chartronella unicostata – type locality for species
- {{multiple image
| total_width = 248 | image1 = Chinlea BW.jpg | alt1 = | image2 = Chirotherium.jpg | alt2 = | footer = Left: Life restoration of the Late Triassic coelacanth fish Chinlea. Right: Restorative model of the hypothetical trackmaker of the Late Triassic ichnogenus Chirotherium with real fossil footprints in the background.}} †Chinlea – type locality for genus - †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
- {{multiple image
| total_width = 248 | image1 = Ptilodus.jpg | alt1 = | image2 = Cladophlebis nebbensis - National Museum of Nature and Science, Tokyo - DSC07005.JPG | alt2 = | footer = Left: Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys. Right: Fossilized foliage of the Permian-Late Cretaceous fern Cladophlebis.}} †Cimolomys - †Cimolomys clarki
- †Cimolomys milliensis – type locality for species
- †Cionichthys – type locality for genus
- †Cionichthys dunklei – type locality for species
- Cladophlebis
- †Cladophlebis constricta
- †Cladophlebis parva
- †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
- †Coelurus
- †Compsemys
- †Confusionella
- †Coniophis
- †Coniopteris
- †Coniopteris hymenophylloides
- †Contogenys
- †Contogenys sloani – or unidentified comparable form
- Corbula
- †Cordillerites
- †Cordillerites compressus
- †Corviconodon
- †Corviconodon utahensis – type locality for species
- Cossmannea
- †Cossmannea imayi
- †Cossmannea imlayi
- †Cossmannea kanabensis
- †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
- †Cycadeoidea
- †Cycadeoidea cleavelandii
- †Cycadeoidea medullara
- 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{{Compact ToC}}- †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
- {{multiple image
| total_width = 248 | image1 = Deinonychus_ewilloughby.png | alt1 = | image2 = Diabloceratops NT.jpg | alt2 = | footer = Left: Life restoration of the Early Cretaceous dromaeosaur ("raptor") Deinonychus. Right: Life restoration of the Late Cretaceous horned dinosaur Diabloceratops.}} †Deinonychus - †Denazinemys
- Dentalium
- †Dentalium sublineatum – or unidentified related form
- †Diabloceratops – type locality for genus
- †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
- {{multiple image
| total_width = 248 | image1 = Diplodocus carnegii.jpg | alt1 = | image2 = Dolichorhynchops.jpg | alt2 = | footer = Left: Life restoration of the Late Jurassic long-necked dinosaur Diplodocus. Right: Mounted fossilized skeleton of the Late Cretaceous plesiosaur Dolichorhynchops.}} †Diplodocus - †Diplodocus hallorum
- †Diplodocus longus
- 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{{Compact ToC}}- †Elegantinia
- Elliptio
- †Enchodus
- †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
- {{multiple image
| total_width = 248 | image1 = Eodephis browni.jpg | alt1 = | image2 = Eolambia.png | alt2 = | footer = Left: Fossilized mandible in multiple views of the Late Cretaceous mammal Eodelphis. Right: Illustration of a reconstructed skull and restorative portrait of the Late Cretaceous primitive duck-billed dinosaur Eolambia.}} †Eodelphis - †Eoginkgoites
- †Eolambia – type locality for genus
- †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
- †Exesipollenites tumulosus
- †Exogyra
- †Exogyra acroumbonata
- †Exogyra levis
- †Exostinus – or unidentified comparable form
F{{Compact ToC}}- †Fabrosaurus – tentative report
- †Falcarius – type locality for genus
- †Falcarius utahensis – type locality for species
- Ficus
- †Flemingites
- †Frenelopsis
- †Frenelopsis varians
- †Frenelopsis variens
G{{Compact ToC}}- †Gastonia – type locality for genus
- †Gastonia burgei – type locality for species
- †Geltena
- †Geminiraptor
- †Germanonautilus – tentative report
- †Gervillaria
- †Gervillaria montanaensis
- †Gervillia
- Gleichenia
- †Gleichenia comptoniaefolia
- †Gleichenia delicatula
- †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
- {{multiple image
| total_width = 330 | image1 = Goniopholis BW.jpg | alt1 = | image2 = Eubrontes01.JPG | alt2 = | image3 = Gryposaurus Monumentsis Skull, Alf Museum.JPG | alt3 = | footer = Left: Life restoration of the Late Jurassic-Early Cretaceous crocodile relative Goniopholis. Middle: Fossil of the theropod dinosaur footprint ichnogenus Grallator. Right: Mounted fossilized skeleton of the Late Cretaceous duck-billed dinosaur Gryposaurus.}} †Goniopholis - †Grallator
- †Grammatodon
- †Gryphaea
- †Gryphaeostrea
- †Gryposaurus
- †Gryposaurus monumentensis – type locality for species
- †Guodunites
- †Gwyneddichnium
- †Gypsonictops
H{{Compact ToC}}- †Hagryphus – type locality for genus
- †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
- †Hippodraco – type locality for genus
- †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
- †Hybodus
- †Hyporosopora
- †Hyporosopora nielsoni – type locality for species
I{{Compact ToC}}- †Icacinoxylon
- †Icacinoxylon pittiense – type locality for species
- †Idahocolumbites
- {{multiple image
| total_width = 248 | image1 = Life restoration of Iguanacolossus.jpg | alt1 = | image2 = Inoceramus steenstrup, world's largest fossil mollusk.jpg | alt2 = | footer = Left: Life restoration of the Early Cretaceous Iguanodon relative Iguanacolossus. Right: Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size.}} †Iguanacolossus – type locality for genus - †Iguanacolossus fortis – type locality for species
- †Iguanodon
- †Iguanodon ottingeri – type locality for species
- Ilex
- †Inoceramus
- †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
- Isognomon
- †Isognomon perplana – or unidentified comparable form
- †Iugomortiferum – type locality for genus
- †Iugomortiferum thoringtoni – type locality for species
J{{Compact ToC}}- †Janumys – type locality for genus
- †Janumys erebos – type locality for species
- †Janumys erebros
- †Jeanbesseiceras
- †Jeanbesseiceras jacksoni
- †Jugulator
- †Juvenites
- †Juvenites spathi – or unidentified related form
- †Juvenites thermarum – or unidentified comparable form
K{{Compact ToC}}- †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
- †Kosmoceratops – type locality for genus
- †Kosmoceratops richardsoni – type locality for species
- †Kouphichnium
L{{Compact ToC}}- †Ladinaticella
- †Ladinaticella striatocostata
- †Lanceolites
- †Lanceolites bicarinatus
- †Lanceolites compactus
- †Lasalichthys – type locality for genus
- †Lasalichthys hillsi – type locality for species
- †Latochara
- †Laubopsis – tentative report
- †Legumen
- {{multiple image
| total_width = 248 | image1 = Leidyosuchus canadensis, Dinosaur Provincial Park, Alberta, Canada, Late Cretaceous - Royal Ontario Museum - DSC00090.JPG | alt1 = | image2 = Lepidotes elvensis.JPG | alt2 = | footer = Left: Fossilized skull of the Late Cretaceous alligator relative Leidyosuchus. Right: Fossilized skeleton of the Early Jurassic-Late Cretaceous bony fish Lepidotes.}} †Leidyosuchus - †Lenticidaris – type locality for genus
- †Lenticidaris utahensis – type locality for species
- †Lepidotes
- †Lepidotes walcotti – type locality for species
- Lepisosteus
- †Leptalestes
- †Leptochamops
- †Leptochamops denticulatus
- †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
- †Lyosoma enoda
- †Lyosoma powelli
- †Lythronax – type locality for genus
- †Lythronax argestes – type locality for species
M{{Compact ToC}} | total_width = 330 | image1 = Machairoceratops_NT_small.jpg | alt1 = | image2 = Tarbosaurus egg in Vienna.jpg | alt2 = | image3 = Sweetbay Magnolia Magnolia virginiana Flower Closeup 2146px.jpg | alt3 = | footer = Left: Life restoration of the Late Cretaceous horned dinosaur Machairoceratops. Middle: Fossils of the Cretaceous theropod dinosaur egg oogenus Macroelongatoolithus. Right: Close-up view of a Magnolia flower.}} †Machairoceratops – type locality for genus - †Machairoceratops cronusi – type locality for species
- †Macroelongatoolithus
- †Macroelongatoolithus carlylei – type locality for species
- †Mactromya – tentative report
- †Magadiceramus
- †Magadiceramus crenelatus
- †Magadiceramus crenistriatus
- †Magadiceramus soukupi
- Magnolia
- {{multiple image
| total_width = 248 | image1 = Acanthoceratidae - Mammites nodosoides.JPG | alt1 = | image2 = Marshosaurus restoration.jpg | alt2 = | footer = Left: Fossilized shell of the Late Cretaceous ammonoid cephalopod Mammites. Right: Life restoration of the Late Jurassic megalosaur Marshosaurus.}} †Mammites - †Marshosaurus – type locality for genus
- †Marshosaurus bicentesimus – type locality for species
- †Martharaptor – type locality for genus
- †Martharaptor greenriverensis – type locality for species
- †Matonidium
- †Matonidium brownii
- †Matonidium lancipinnulum
- †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
- †Meniscoessus
- †Meniscoessus intermedius
- †Meniscognathus
- †Meniscognathus altmani – or unidentified comparable form
- †Meniscognathus molybrochoros – type locality for species
- †Mesembrioxylon
- †Mesembrioxylon stokesi
- †Mesembrioxylon stokesii
- †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
- †Metoicoceras geslinianum
- †Microcachrydites
- †Microconchus
- †Microeciella
- †Microeciella duoflavina
- †Microeciella pollostos – type locality for species
- †Minersvillites – type locality for genus
- †Minersvillites farai – type locality for species
- †Miocidaris
- †Moabosaurus – type locality for genus
- †Moabosaurus utahensis – type locality for species
- Modiolus
- †Modiolus isonemus
- †Modiolus subimbricatus
- †Monanthesia
- †Monocnemodon – type locality for genus
- †Monocnemodon syphakos – type locality for species
- †Myalina
- †Myledaphus
- †Myoconcha
- †Myoconcha plana – or unidentified comparable form
- †Myopholas
- †Myophorella
- †Myophorella livinigstonensis
- †Myophorella monatanaensis
- †Myophorella yellowstonensis
- †Myophoria
- †Mytiloides
- †Mytiloides submytiloides – or unidentified related form
- †Mytilus
- †Mytilus whitei – or unidentified comparable form
N{{Compact ToC}}- †Naomichelys
- †Nasutoceratops – type locality for genus
- †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
- †Nerinea – tentative report
- †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
- †Nothronychus
- †Nothronychus graffami – type locality for species
- Nucula
- Nuculana
- †Nuculana mutuata – or unidentified comparable form
- †Nymphalucina
- †Nymphalucina linearia – or unidentified related form
O{{Compact ToC}}- †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
- †Ostrea occidentalis
- †Ostrea strigulecula
- †Othnielosaurus
- †Otozoum
- †Ovaloolithus
- †Ovaloolithus tenuisus – type locality for species
- †Ovaloolithus utahensis – type locality for species
- †Owenites
- †Owenites carpenteri
- †Owenites koeneni
P{{Compact ToC}}- †Pachyomphalus
- †Pachyomphalus americanus – type locality for species
- †Pagiophyllum
- †Paiutemys – type locality for genus
- †Paiutemys tibert – type locality for species
- †Palaeophycus – or unidentified comparable form
- †Palaeopiceoxylon
- †Palaeopiceoxylon thinosu
- †Palaeopiceoxylon thinosus
- †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
- †Paraphyllanthoxylon utahense
- †Parasaniwa
- †Parasaniwa cynochoros – type locality for species
- †Parasaniwa wyomingensis – or unidentified comparable form
- †Parasaurolophus
- †Parasaurolophus cyrtocristatus
- †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
- Pholadomya
- †Pholadomya inaequiplicata
- †Pholadomya kingi
- †Piarorhynchella
- †Piarorhynchella triassica
- †Piarorhynchella triassicus
- †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
- †Placenticeras
- Placopsilina
- †Plagioglypta
- †Plagiostoma
- †Plagiostoma occidentalis
- †Plagiostoma ziona
- †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
- †Poposaurus
- †Preflorianites
- †Preprismatoolithus
- †Preprismatoolithus coloradensis
- †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
- †Promyalina putiatinensis
- †Promyalina spathi
- †Promysidiella
- †Pronoella
- †Pronoella cinnabarensis – or unidentified comparable form
- †Pronoella uintahensis
- †Proplacenticeras
- †Proplacenticeras stantoni
- †Prorokia
- †Protalphadon
- †Protocardia
- †Protogusarella
- †Protopis
- †Protopis waageni – or unidentified related form
- †Protovirgularia
- †Psalandon – tentative report
- †Pseudaspidoceras
- †Pseudocalycoceras
- †Pseudocorbula
- †Pseudohypolophus
- †Pseudomelania
- †Pseudomyoconcha – tentative report
- †Pseudoptera
- †Pseudosageceras
- †Pseudosageceras multilobatum
- †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
- Pycnodonte
Q{{Compact ToC}}- †Quenstedtia
- †Quenstedtia bathonica – or unidentified related form
R{{Compact ToC}}- †Radioceras
- †Radioceras evolvens – or unidentified related form
- †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
- †Rhynchosauroides schochardti
- †Rhynchostreon
- †Richardoestesia
- †Richardoestesia isosceles – or unidentified comparable form
- Rogerella
- †Rotodactylus
- †Rotodactylus cursorius – type locality for species
S{{Compact ToC}}- †Sabalites
- †Sabalites NE008 – informal
- Salix
- †Sauropelta – or unidentified comparable form
- †Scapherpeton
- †Schillerosaurus – type locality for genus
- †Schillerosaurus utahensis – type locality for species
- †Sciponoceras
- †Scotiophryne
- †Scoyenia
- †Seitaad – type locality for genus
- †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
- †Serpula intrica
- †Serpula large
- †Sexta
- †Sexta navicula – or unidentified related form
- †Siats – type locality for genus
- †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
- †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
- †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
- †Stokesosaurus – type locality for genus
- †Stokesosaurus clevelandi – type locality for species
- Stomatopora
- †Stomohamites
- †Strobeus
- †Submeekoceras
- †Submeekoceras mushbachanum
- †Symmetrocapulus – tentative report
- †Symmetrocapulus corrugatus
- †Symmetrodontoides
- †Symmetrodontoides foxi – type locality for species
- †Symmetrodontoides oligodontos – type locality for species
- †Syncyclonema
- †Synorichthys
T{{Compact ToC}}- †Talos – type locality for genus
- †Talos sampsoni – type locality for species
- †Tancredia – tentative report
- †Tanycolagreus
- †Tanycolagreus topwilsoni
- †Teinostomopsis – tentative report
- {{multiple image
| total_width = 248 | image1 = Tempskya sp. - MUSE.jpg | alt1 = | image2 = Teratophoneus curriei.png | alt2 = | footer = Left: Life restoration of the Cretaceous tree-like fern Tempskya. Right: Known material diagram of the Late Cretaceous tyrannosaur Teratophoneus.}} †Tempskya - †Tempskya jonesii – type locality for species
- †Tempskya knowltoni
- †Tempskya minor
- †Tempskya superba
- †Tempskya whiteheadi – type locality for species
- †Tenontosaurus
- †Teratophoneus – type locality for genus
- †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
- {{multiple image
| total_width = 248 | image1 = Museum AL dinosaur.jpg | alt1 = | image2 = LA-Triceratops mount-2.jpg | alt2 = | footer = Left: Mounted fossilized skeleton of the Late Jurassic megalosaur Torvosaurus. Right: Mounted fossilized skeleton of the Late Cretaceous horned dinosaur Triceratops.}} †Torvosaurus - †Toxolophosaurus – or unidentified comparable form
- †Trachodon
- †Triceratops
- †Triconolestes – type locality for genus
- †Triconolestes curvicuspis – type locality for species
- †Trigonia
- †Trigonia americana
- †Trigonia elegantissima
- †Trigonia montanaensis
- †Trigonodus
- †Trigonodus orientalis – or unidentified comparable form
- †Trigonodus sandbergeri – or unidentified comparable form
- †Trigonodus sandbergi – or unidentified comparable form
- †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
- †Tyrannosauripus – type locality for genus
- †Tyrannosauripus petersoni – type locality for species
U{{Compact ToC}}- †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
- †Utahraptor – type locality for genus
- †Utahraptor ostrommaysi – type locality for species
- †Uteodon
V{{Compact ToC}}- Valvata
- †Vancleavea
- †Varalphadon – type locality for genus
- †Varalphadon crebreforme – type locality for species
- †Varalphadon wahweapensis – type locality for species
- †Vaugonia
- †Vaugonia conradi
- †Vaugonia utahensis
- †Venenosaurus – type locality for genus
- †Venenosaurus dicrocei – type locality for species
- †Vercherites
- †Vercherites undulatus – type locality for species
- †Vex
- Viviparus
W{{Compact ToC}}- †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{{Compact ToC}}- †Xenoceltites
- †Xenoceltites cordilleranus
- †Xenoceltites subevolutus
- †Xiaoqiaoceras – tentative report
- †Xiaoqiaoceras americanum – type locality for species
Y{{Compact ToC}}- †Yurgovuchia – type locality for genus
- †Yurgovuchia doellingi – type locality for species
Z{{Compact ToC}}- †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- {{cite web |title=Fossilworks: Gateway to the Paleobiology Database |author=Various Contributors to the Paleobiology Database |url=http://fossilworks.org/ |accessdate=7 August 2017}}
{{Era nav|title=Lists of the prehistoric life of Utah|prefix=List of the |suffix= life of Utah}}{{Lists of the Mesozoic life of the United States}}{{portalbar|Paleontology|Mesozoic|Utah}} 6 : Geology of Utah|Lists of prehistoric life in the United States|Natural history of Utah|Paleontology in Utah|Mesozoic Utah|Mesozoic life of North America |