ORDER PROBOSCIDEA ORDER SIRENIA FAMILY ELEPHANTIDAE … to Know Afrotheria2.pdf · order...
Transcript of ORDER PROBOSCIDEA ORDER SIRENIA FAMILY ELEPHANTIDAE … to Know Afrotheria2.pdf · order...
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ORDER PROBOSCIDEA FAMILY ELEPHANTIDAE GENUS Elephas ORDER HYRACOIDEA FAMILY PROCAVIIDAE GENUS Procavia
ORDER SIRENIA FAMILY DUGONG GENUS Dugong FAMILY TRICHECHIDAE GENUS Trichechus ORDER TUBILDENTATA FAMILY ORYCTEROPODIDAE GENUS Orycteropus
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ORDER
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FAMILY ORYCTEROPODIDAE
GENUS: Orycteropus
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FAMILY ORYCTEROPODIDAE
-teeth are flat-topped, lack enamel -mesial drift -diet: ants and termites -fossorial
Range: Africa, south of the Sahara
GENUS: Orycteropus
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ORDER
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FAMILY ELEPHANTIDAE
GENUS: Elephas
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Range: Africa south of Sahara (Loxodon); Southern Asia (Elephas)
FAMILY ELEPHANTIDAE GENUS: Elephas
- mesial drift - lophodont teeth - ever-growing incisors (tusks) - herbivores - heavy skull lightened by air cavities - matrilines - 80 year lifespan - 18-24 month gestation
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ORDER
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FAMILY PROCAVIIDAE
GENUS: Procavia
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FAMILY PROCAVIIDAE GENUS: Procavia
-special muscular pads on soles for traction on rocky areas and form ‘suction cups’ -upper incisors ever- growing -enamel only on front -herbivorous -nocturnal
Range: Africa, south of the Sahara but extends in E. Africa to the Middle East
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ORDER
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FAMILY DUGONGIDAE
GENUS: Dugong
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FAMILY DUGONGIDAE
GENUS: Dugong
- has forelimbs, no hindlimbs -tail has two pointed projections -nasal bones reduced or absent -teeth are simple columnar - 2 tusk-like incisors - Stellar’s sea cow extinct (Bering Sea)
Range: E. Africa, S. Asia, and Australia coastal waters
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FAMILY TRICHECHIDAE
GENUS: TrichechuS
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FAMILY TRICHECHIDAE GENUS: TrichechuS
-round, paddle-like tail -no upper incisors -mesial drift -pachyostosis = dense rib bones used as ballast to fight buoyancy -only 6 cervical vertebrae
Range: N. and S. America warm coastal waters on Atlantic side; west Africa; sometimes migrate deep up rivers