page_title: List of the Mesozoic life of Utah
section_title: A
hierarchical_section_title: List of the Mesozoic life of Utah / A
caption_attribution_description: Animantarx - 01
context_page_description: 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.
context_section_description: †Abrekopsis
  †Abrekopsis depresispirus – type locality for species
  †Abydosaurus – type locality for genus
  †Abydosaurus mcintoshi – type locality for species
  †Aclistochara
  †Aclistochara bransoni
   †Acristavus
  †Acristavus gagslarsoni
  †Adelodelphys
  †Adelodelphys muizoni
  †Adelolophus – type locality for genus
  †Adelolophus hutchisoni – type locality for species
  †Admetopsis
  †Adocus
  †Aenigmadelphys
  †Aenigmadelphys archeri – type locality for species
   †Alamosaurus
  †Alamosaurus sanjuanensis
  †Albanerpeton
  †Albanerpeton cifellii – type locality for species
  †Albanerpeton galaktion
  †Albanerpeton gracilis
  †Albanerpeton nexuosus
  †Aletridelphys
  †Aletridelphys hatcheri
  †Allocrioceras
  †Allocrioceras annulatum
   †Allosaurus
  †Allosaurus fragilis
  †Alphadon
  †Alphadon attaragos
  †Alphadon eatoni – type locality for species
  †Alphadon halleyi
  †Alphadon marshi – or unidentified comparable form
  †Alphadon sahnii
  †Alzadites
  †Alzadites incomptus
  †Amberleya – tentative report
  †Amblotherium
  †Amblotherium gracilis
  †Ameribaatar – type locality for genus
  †Ameribaatar zofiae – type locality for species
  †Ameribataar
  †Ameribataar zofiae
  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
  †Anchisauripus sillimani
  †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
   †Animantarx – type locality for genus
  †Animantarx ramaljonesi – type locality for species
  †Anisomyon
  Anomia
  †Anomoepus
  †Apatopus
  †Apatopus lineatus
  †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
  †Araeodon intermissus
  †Araucariacites
  †Araucariacites australis
  †Araucariacites fissus
   †Araucarioxylon
  †Arcomya
  †Arctoceras
  †Arctoceras tuberculatum
  †Arctoprionites
  †Arctoprionites resseri
  †Arvinachelys – type locality for genus
  †Arvinachelys goldeni – type locality for species
  †Aspenites
  †Aspenites acutus
  Astarte
  †Astarte livingstonensis
  †Astarte meeki
   Asteriacites
  †Asteriacites lumbricalis
  †Astralopteris
  †Astralopteris coloradica
  †Astroconodon
  †Astroconodon delicatus – type locality for species
  †Atreipus
  †Atreipus milfordensis
  †Aublysodon – tentative report
  †Aucellina
  †Austrotindaria
  †Austrotindaria canalensis
  †Austrotindaria svalbardensis
  †Avitotherium – type locality for genus
  †Avitotherium utahensis – type locality for species
caption: Mounted fossilized skeleton of the Cretaceous armored dinosaur Animantarx
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