page_title: List of the Cenozoic life of South Dakota
section_title: M
hierarchical_section_title: List of the Cenozoic life of South Dakota / M
caption_attribution_description: Metamynodon.
context_page_description: This list of the Cenozoic life of South Dakota contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of South Dakota and are between 66 million and 10,000 years of age.
context_section_description: †Macrogenis
  †Macrogenis crassigenis
  †Macrognathomys
  †Macrognathomys gemmacolis – type locality for species
  †Macrorhineura – type locality for genus
  †Macrorhineura skinneri – type locality for species
  †Mammacyon
  †Mammacyon obtusidens – type locality for species
  †Mammuthus
   †Mammuthus columbi
  †Mammuthus primigenius
  †Manitsha – type locality for genus
  †Manitsha tanka – type locality for species
  Martes
  †Martes campestris
  †Megacerops
  †Megacerops coloradensis
  †Megacerops curtus
  †Megachoerus – tentative report
  †Megachoerus latidens – type locality for species
  †Megalagus
  †Megalagus primitivus – or unidentified comparable form
  †Megalagus turgidus
  †Megaleptictis
  †Megaleptictis altidens
  †Megalictis
  †Megalictis ferox – type locality for species
  †Megalonyx
   †Megalonyx leptostomus
  †Megalonyx wheatleyi
  †Megapaloelodus – type locality for genus
  †Megapaloelodus connectens – type locality for species
  †Megasminthus
  †Megasminthus gladiofex – type locality for species
  †Megasminthus tiheni
  †Megoreodon
  †Megoreodon grandis
  †Meniscomys
  †Meniscomys hippodus
   †Menoceras
  †Menoceras barbouri
  †Menops
  †Menops marshi
  †Menops serotinus
  †Menops walcotti
  †Merychippus
  †Merychippus insignis
  †Merychyus
  †Merychyus arenarum
  †Merychyus minimus
  †Merychyus novomexicanus
   †Merycochoerus
  †Merycochoerus chelydra
  †Merycochoerus matthewi – type locality for species
  †Merycodus
  †Merycodus major – or unidentified comparable form
  †Merycodus necatus
  †Merycoides
  †Merycoides longiceps
  †Merycoides pariogonus – or unidentified comparable form
  †Merycoidodon
  †Merycoidodon bullatus – type locality for species
  †Merycoidodon culbertsoni – type locality for species
  †Merycoidodon major
   †Mesocyon
  †Mesocyon temnodon
  †Mesohippus
  †Mesohippus bairdi
  †Mesohippus exoletus
  †Mesoreodon
  †Mesoreodon chelonyx
  †Mesoreodon minor
  †Mesoscalops
   †Metamynodon
  †Metamynodon chadronensis – type locality for species
  †Metamynodon planifrons
  †Michenia
  †Michenia exilis
  Microtus
  †Microtus meadensis
  †Microtus paroperarius
  Mictomys
  †Mictomys kansasensis
  †Mimomys
  †Mimomys dakotaensis
  †Miniochoerus
  †Miniochoerus affinis
  †Miniochoerus forsythae
  †Miniochoerus gracilis
  †Miniochoerus starkensis – type locality for species
  †Mioheteromys
  †Mioheteromys arcarius
   †Miohippus
  †Miohippus annectens – type locality for species
  †Miohippus equiceps
  †Miohippus equinanus
  †Miohippus gemmarosae – or unidentified comparable form
  †Miohippus gidleyi – type locality for species
  †Miohippus grandis
  †Miohippus intermedius – type locality for species
  †Miohippus obliquidens – type locality for species
  †Mionictis
  †Mionictis pristinus
  †Miortyx – type locality for genus
  †Miortyx teres – type locality for species
  †Miospermophilus – or unidentified comparable form
  †Monosaulax
  †Monosaulax curtus – or unidentified comparable form
   †Moropus
  Mustela
  †Mustelavus
  †Mustelavus priscus – type locality for species
  †Mylagaulus
  †Mylagaulus sesquipedalis – or unidentified comparable form
  †Mystipterus
  †Mystipterus martini – or unidentified comparable form
caption: Restoration of the Eocene-Miocene swamp rhinoceros Metamynodon. Charles R. Knight (1896).
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