page_title: List of dinosaur genera
section_title: M
hierarchical_section_title: List of dinosaur genera / M
caption_attribution_description: Muttaburrasaurus skeleton Queensland Museum Photo: Cas Liber
context_page_description: Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago, although the exact origin and timing of the evolution of dinosaurs is the subject of active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 million years ago; their dominance continued throughout the Jurassic and Cretaceous periods. The fossil record demonstrates that birds are modern feathered dinosaurs, having evolved from earlier theropods during the Late Jurassic epoch. As such, birds were the only dinosaur lineage to survive the Cretaceous–Paleogene extinction event approximately 66 million years ago. Dinosaurs can therefore be divided into avian dinosaurs, or birds; and non-avian dinosaurs, which are all dinosaurs other than birds.
  This list of dinosaurs is a comprehensive listing of all genera that have ever been considered to be non-avian dinosaurs, but this list also includes some dinosaurs which are disputed to be either avian or non-avian, as well as purely vernacular terms.
context_section_description: Macelognathus –  a sphenosuchian crocodilian
  Machairasaurus
  Machairoceratops
  Macrocollum
  Macrodontophion -  a member of Lophotrochozoa
  Macrogryphosaurus
  Macrophalangia – junior synonym of Chirostenotes
  "Macroscelosaurus" – nomen nudum; probable junior synonym of Tanystropheus
  Macrurosaurus
  "Madsenius" – nomen nudum, Allosaurus
  Magnamanus
  Magnapaulia
  Magnirostris
  Magnosaurus
  "Magulodon" – nomen nudum
  Magyarosaurus
  Mahakala
  Mahuidacursor
  Maiasaura
  Majungasaurus
  Majungatholus – junior synonym of Majungasaurus
  Malarguesaurus
  Malawisaurus
  Maleevosaurus – junior synonym of Tarbosaurus
  Maleevus
  Mamenchisaurus
  Mandschurosaurus
  Manidens
  Manospondylus – synonym of Tyrannosaurus
  Mansourasaurus
  Mantellisaurus
  Mantellodon - junior synonym of Mantellisaurus
  Maojandino - nomen nudum
  Mapusaurus
  Maraapunisaurus
  Marasuchus –  a non-dinosaurian dinosauromorph
  Marisaurus - nomen nudum
  Marmarospondylus
  Marshosaurus
  Martharaptor
  Masiakasaurus
  Massospondylus
  Matheronodon
  Maxakalisaurus
  Medusaceratops
  "Megacervixosaurus" – nomen nudum
  "Megadactylus" – preoccupied name, now known as Anchisaurus
  "Megadontosaurus" – nomen nudum; Microvenator
  Megalosaurus
  Megapnosaurus – junior synonym of Coelophysis
  Megaraptor
  Mei
  Melanorosaurus
  Mendozasaurus
  Mercuriceratops
  Meroktenos
  Metriacanthosaurus
  "Microcephale" – nomen nudum
  "Microceratops" – preoccupied name, now known as Microceratus
  Microceratus
  Microcoelus
  "Microdontosaurus" – nomen nudum
  Microhadrosaurus
  Micropachycephalosaurus
  Microraptor
  Microvenator
  Mierasaurus
  "Mifunesaurus" – nomen nudum
  Minmi
  Minotaurasaurus
  Miragaia
  Mirischia
  Mnyamawamtuka
  Moabosaurus
  Mochlodon
  "Mohammadisaurus" – nomen nudum; Tornieria
  Mojoceratops – junior synonym of Chasmosaurus
  Mongolosaurus
  Mongolostegus
  Monkonosaurus
  Monoclonius
  Monolophosaurus
  "Mononychus" – preoccupied name, now known as Mononykus
  Mononykus
  Montanoceratops
  Morelladon
  Morinosaurus
  Moros
  Morosaurus – junior synonym of Camarasaurus
  Morrosaurus
  Mosaiceratops
  "Moshisaurus" – nomen nudum; possibly Mamenchisaurus
  "Mtapaiasaurus" – nomen nudum, probably Giraffatitan
  "Mtotosaurus" – nomen nudum; Dicraeosaurus
  Murusraptor
  Mussaurus
  Muttaburrasaurus
  Muyelensaurus
  Mymoorapelta
caption: Cast of a Muttaburrasaurus skeleton.
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