page_title: List of the Mesozoic life of Utah
section_title: M
hierarchical_section_title: List of the Mesozoic life of Utah / M
caption_attribution_description: English: Life Restoration of Marshosaurus
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: †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
  †Magnolia boulayana
  †Mammites
  †Mammites nodosoides
   †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
  †Microconchus utahensis
  †Microeciella
  †Microeciella duoflavina
  †Microeciella pollostos – type locality for species
  †Minersvillites – type locality for genus
  †Minersvillites farai – type locality for species
  †Miocidaris
  †Miocidaris utahensis
   †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
  †Moros – type locality for genus
  †Moros intrepidus – type locality for species
  †Myalina
  †Myledaphus
  †Myledaphus bipartitus
  †Myoconcha
  †Myoconcha plana – or unidentified comparable form
  †Myopholas
  †Myopholas hardyi
   †Myophorella
  †Myophorella livinigstonensis
  †Myophorella monatanaensis
  †Myophorella yellowstonensis
  †Myophoria
  †Mytiloides
  †Mytiloides submytiloides – or unidentified related form
  †Mytilus
  †Mytilus whitei – or unidentified comparable form
caption: Life restoration of the Late Jurassic megalosaur Marshosaurus
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