page_title: List of the Paleozoic life of Michigan
section_title: M
hierarchical_section_title: List of the Paleozoic life of Michigan / M
caption_attribution_description: English: Mucrospirifer mucronatus (Conrad, 1841) from the Silica Shale Formation (Middle Devonian) in Paulding County, Ohio. Dorsal valve view.
context_page_description: This list of the Paleozoic life of Michigan contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Michigan and are between 541 and 252.17 million years of age.
context_section_description: †Maelonoceras
  †Maelonoceras ligarius
  †Manitobiella
  †Manitobiella goniostoma
  †Mariopteris
  †Mariopteris muricata
  †Mariopteris nervosa
  †Mastigograptus
  †Mastigospira
  †Mastigospira ingens – type locality for species
  †Mastigospira intermedia – type locality for species
  †Mediospirifer
  †Mediospirifer audaculus
  †Megastrophia
  †Megastrophia concava
   †Meristella
  †Mesocoelia
  †Mesocoelia obstipisutura
  †Mesocoelia priscum
  †Mesotrypa
  †Modiolopsis
  †Modiolopsis noquettensis
  †Modiolopsis valida
  †Monticulipora
  †Monticulipora epidermata
     †Mucrospirifer
  †Mucrospirifer attenuatus
  †Mucrospirifer grabaui
  †Mucrospirifer latus
  †Mucrospirifer mucronatus
  †Mucrospirifer profundus
  †Mucrospirifer prolificus
  †Mucrospirifer thedfordensis
  †Murchisonia
  †Murchisonia akidota
  †Murchisonia anderdoniae
  †Murchisonia deludisubzona – type locality for species
  †Murchisonia dowlingii
  †Murchisonia gracilicrista
  †Murchisonia sibleyensis
  †Murchisonia subcarinata
  †Murchisonia subulata – type locality for species
caption: Fossilized shell of the Devonian brachiopod Mucrospirifer
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