XENARTHRA Pholidota

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XENARTHRAPholidota Tubulidentata

• Mostly insectivorous but unrelated
• EEOB 625
• 26 February 2004
• -----------------------------------------
• Notice Change in lab. schedule for 2627 Jan.
  lab sections will meet at Waterman Farm dairy
  pasture for vole runway study. See map in
  lecture.

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Order Xenarthra

• Fossil armadillos of the Paloecene
• Successful Nearctic taxon (130 genera!)
• Xenarthrous articulations on the vertebrae
• Convergence of myrmecophagous taxa
• Examples how many taxa can you name?
• - nature of the food source predation
• - role of Continental drift isolation

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Orders Xenarthra, Pholidota, Tubulidentata

• Order Xenarthra
• Bradypodidae Neotropical
• Dasypodidae Neotropical (Nearctic)
• Myrmechophagidae Neotropical
• Order Pholidota
• Manidae Ethiopian Oriental
• Order Tubulidentata
  Orycteropodidae Ethiopian

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Colbert, 1969
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Colbert 69
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Order Xenarthra

• Fossil armadillos of the Paloecene
• Successful Nearctic taxon (130 genera!)
• Xenarthrous articulations on the vertebrae
• Convergence of myrmecophagous taxa
• Examples how many taxa can you name?
• - nature of the food source predation
• - role of Continental drift isolation

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Fig 14.2 Feldhamer but see Vaughan Fig. 9-1
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Convergence of
myrmecophagous mammals

Fig 25-6 Vaughan
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Great American Faunal Interchange

• Geologic history of north/south land connection
• Cenozoic radiations of Eutheria in N. So. Am.
• Ground Sloths Glyptodonts invade N. Am.
• Many more N. American Taxa invade S. America and
  are successful
• Why the difference?
•  

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Emergent land
Late Miocene
Fig. 25-12 (Vaughan 00)
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Emergent Land
Pliocene
Fig 25-12 (Vaughan et al. 00)
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Invaders from the South
Fig. 25-13 (Vaughan 00)
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Fig. 26.8, Feldhamer
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Invaders from the North
Fig 25-13, Vaughan
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Fig. 26.8, Feldhamer