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Insectivora and Marsupialia of Millennium Park

Insectivora and Marsupialia of Millennium Park . Meghan Maraia. Order Marsupialia . 18 families, 250 species Confidently monophyletic General Characters 3 premolars 4 molars Palatal fenestrae Inflected angular process Marsupium Epipubic bones in both sexes. Characters. Characters.

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Insectivora and Marsupialia of Millennium Park

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  1. Insectivora and Marsupialia of Millennium Park Meghan Maraia

  2. Order Marsupialia • 18 families, 250 species • Confidently monophyletic • General Characters • 3 premolars 4 molars • Palatal fenestrae • Inflected angular process • Marsupium • Epipubic bones in both sexes

  3. Characters

  4. Characters Epipubic bones of Didelphis virginiana

  5. Didelphis virginiana • Virginia Opossum • Distinguishing characters • Prehensile tail • Opposable big toe • 50 teeth • Pronounced sagittal crest • Prefer woodland environments, found in prairies and marshes

  6. Fossils of Millennium Park Ischium

  7. Fossils Cont’d • Thoracic, lumbar and cervical vertebrae • Left mandible, edentulous • M1, lower left

  8. Order Insectivora • 4 families, 442 species • Family Sorcidae • -Shrews • No zygomatic arch • - Incisor #1 is large and hooked • - Strongly procumbent lower incisors • Family Talpidae • - Moles • complete zygomatic arch • - Pinnae is absent • Eimer’s organ – sensory organ • Keeled sternum

  9. Cryptotis parva • Least Shrew • Distinguishing characters • Short tail • Long pointed snout • Chestnut colored cusps • 4 unicuspid teeth • Most often occur in dry open grassland

  10. Fossils of Millennium Park • Molar, right lower • Sorcidae, but no species : • -Upper incisor • -Partial right mandible, edentulous

  11. Scalopus aquaticus • Eastern Mole • Distinguishing characters • Forelimb and pectoral girdle modified for digging • Hinged fur • Permit backward and forward movement in burrows • Thin zygomatic arch • Prefer well-drained soil of open fields

  12. Fossils of Millennium Park • Right and Left humerus • Ulna • M1 or M2 lower molar

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