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The tail fluke of a dugong is notched and similar to those of dolphins, whereas the tail fluke of manatee is paddle-shaped. [9] The fluke is pumped up and down in long strokes to move the animal forward, or twisted to turn. The forelimbs are paddle-like flippers which aid in turning and slowing.
The manatee's tail is paddle-shaped, and is the clearest visible difference between manatees and dugongs; a dugong tail is fluked, similar in shape to that of a whale. The manatee is unusual among mammals in having just six cervical vertebrae , [ 11 ] a number that may be due to mutations in the homeotic genes . [ 12 ]
Paenungulata (from Latin paene "almost" + ungulātus "having hoofs") is a clade of "sub-ungulates", which groups three extant mammal orders: Proboscidea (including elephants), Sirenia (sea cows, including dugongs and manatees), and Hyracoidea . At least two more possible orders are known only as fossils, namely Embrithopoda and Desmostylia. [a]
The dugong (/ ˈ d (j) uː ɡ ɒ ŋ /; Dugong dugon) is a marine mammal.It is one of four living species of the order Sirenia, which also includes three species of manatees.It is the only living representative of the once-diverse family Dugongidae; its closest modern relative, Steller's sea cow (Hydrodamalis gigas), was hunted to extinction in the 18th century.
1 Order: Sirenia (manatees and dugongs) 2 Order: Chiroptera (bats ... Download as PDF; Printable version; ... and forelimbs and tail modified to provide propulsion ...
FILE - Serena, a dugong, swims at the Toba Aquarium in Toba, Japan on Sept. 5, 2012. Populations of the vulnerable species of marine mammal, numerous species of abalone and a type of Caribbean ...
West Indian manatees. Sirenia is an order of fully aquatic, herbivorous mammals that inhabit rivers, estuaries, coastal marine waters, swamps, and marine wetlands. All four species are endangered. Family: Trichechidae. Genus: Trichechus. West Indian manatee, T. manatus VU extirpated
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