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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.
[30] [32] Unlike manatees, the dugong lacks nails on its flippers, which are only 15% of a dugong's body length. [33] Manatees generally glide at speeds of 8 kilometres per hour (5 mph), but can reach speeds of 24 kilometres per hour (15 mph) in short bursts. [34] The body is fusiform to reduce drag in the water.
The largest living species in the order Sirenia of dugongs and manatees is the West Indian manatee (Trichechus manatus). The largest manatees are found in the Florida subspecies. The maximum recorded size of this species was 1,655 kg (3,649 lb) and a total length of 4.6 m (15 ft). [26] [129]
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 ]
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 ...
Dugong skeleton displayed at Philippine National Museum. Dugongidae's body weight ranges from 217 to 307 kg for juveniles, 334 to 424 kg for subadults, and 435 to 568.5 kg for adults. Oral temperatures for individual dugongs is determined from 24° to 34.2 °C. Heart rate readings are from 40 to 96 bpm and vary between individual dugongs.
A fossil reveals how a now-extinct species of dugong was swimming in the sea about 15 million years ago when it was preyed upon by a crocodile and a tiger shark.
Manatees make seasonal movements synchronized with the flood regime of the Amazon Basin. [7] They are found in flooded forests and meadows during the flood season, when food is abundant. [7] The Amazonian manatee has the smallest degree of rostral deflection (25° to 41°) among sirenians, an adaptation to feed closer to the water surface. [18]