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Phylogeny of Mammals

Phylogeny of Mammals . Meghan Maraia. Mammals Vs. Synapsids . Specialized Teeth Diverse morphologies of jaws/ear bones Limbs positioned under body Enlarged brain 2-3-3-3-3 digit bones. Homogenous teeth Limbs out to side 2-3-4-5-3 digit bones. Basic Cladogram. Monotremata

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Phylogeny of Mammals

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  1. Phylogeny of Mammals Meghan Maraia

  2. Mammals Vs. Synapsids • Specialized Teeth • Diverse morphologies of jaws/ear bones • Limbs positioned under body • Enlarged brain • 2-3-3-3-3 digit bones • Homogenous teeth • Limbs out to side • 2-3-4-5-3 digit bones

  3. Basic Cladogram Monotremata (egg-laying mammals) Palaeoryctoids* Marsupialia (pouched mammals) Eutheria (placental mammals) Multituberculates* Tricodonta*

  4. Classification using Teeth • Triconodont – relatively unspecialized teeth • Monotremata – adult jaw lack teeth • Multituberculates – teeth with cusps (tubercules) in rows • Marsupialia – four pairs of molars, palatal fenestrae • Palaeoryctoids – wide molars, lack 1st premolar • Eutheria – 5 pairs premolars, 3 pairs molars

  5. Pleistocene Eutheria Fossils in Millennium Park Holmesina septentrianalis, Xanartha, Pampatheriidae Glyptotherium floridanum, Xenartha, Glyptodontidae Smilodon fatalis, Machairodontinae Bison antiquus Equus sp., Equidae Mammuthus columbi

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