page_title: List of the Mesozoic life of Arizona
section_title: M
hierarchical_section_title: List of the Mesozoic life of Arizona / M
caption_attribution_description: Morganucodon watsoni.
context_page_description: This list of the Mesozoic life of Arizona contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Arizona and are between 252.17 and 66 million years of age.
context_section_description: †Machaeroprosopus – type locality for genus
  †Machaeroprosopus buceros
  †Machaeroprosopus jablonskiae – type locality for species
  †Machaeroprosopus mccauleyi – type locality for species
  †Machaeroprosopus pristinus – type locality for species
  †Machaeroprosopus tenuis – type locality for species
  †Machaeroprosopus validus – type locality for species
  †Mammillopora
  †Mammillopora encrusta – type locality for species
  †Mammites
  †Mammites nodosoides
  †Masculostrobus
  †Masculostrobus clathratus – type locality for species
  †Mathilia – tentative report
  †Mathilia ripleyana
  †Meekia
  †Megalosauripus
  †Melvius
  Membranipora – or unidentified comparable form
  †Mesolanites
  †Mesostoma
  †Metaptychoceras
  †Metaptychoceras reesidei
  †Metoicoceras
  †Metoicoceras geslinianum
  †Metoicoceras mosbyense
   †Metoposaurus
  †Metoposaurus fraasi – type locality for species
  †Microsolena
  †Microsolena texana
  † Modiolus
  †Modiolus attenuatus – or unidentified comparable form
  †Modiolus coloradoensis
  †Modiolus perryi – type locality for species
  †Moenkopia – type locality for genus
  †Moenkopia wellesi – type locality for species
  †Monopleura
  †Monopleura marcida – or unidentified comparable form
  †Moremanoceras
  †Moremanoceras scotti
   †Morganucodon
  †Morrowites
  †Mytiloides
  †Mytiloides columbianus
  †Mytiloides duplicostasus – or unidentified related form
  †Mytiloides hercynicus
  †Mytiloides kossmati
  †Mytiloides labiatus
  †Mytiloides latus – or unidentified comparable form
  †Mytiloides mytiloides
  †Mytiloides opalensis
  †Mytiloides submytiloides
  † Mytilus – tentative report
caption: Life restoration of the Late Triassic-Middle Jurassic synapsid (mammal precursor) Morganucodon
exif: {"Image Make": "HP", "Image Model": "HP psc1500", "Image Orientation": "Horizontal (normal)", "Image XResolution": "300", "Image YResolution": "300", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CS3 Windows", "Image DateTime": "2014:01:27 11:34:03", "Image YCbCrPositioning": "Co-sited", "Image ReferenceBlackWhite": "[0, 255, 128, 255, 128, 255]", "Image Saturation": "Normal", "Image Sharpness": "Normal", "Image DeviceSettingDescription": "[1, 0, 19, 0, 32, 32, 32, 48, 65, 48, 32, 32, 32, 55, 65, 48, 32, 32, 32, 56, ... ]", "Image ExifOffset": "844", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "1050", "Thumbnail JPEGInterchangeFormatLength": "3013", "EXIF ExifVersion": "0220", "EXIF DateTimeOriginal": "2011:05:18 23:19:34", "EXIF ComponentsConfiguration": "YCbCr", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "2000", "EXIF ExifImageLength": "978"}