Sirenia
An order of heavy-bodied, slow-moving, completely aquatic, herbivorous mammals. The body is fusiform, plump, and hairless, except for bristles on the snout. Hindlimbs are absent, the forelimbs are modified to flippers, and the tail is a horizontal fluke. (From Scott, Concise Encyclopedia Biology, 1996)
Year introduced: 1999
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Tree Number(s): B01.050.150.900.649.313.250.750
MeSH Unique ID: D020453
Registry Number: txid9774
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