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Sirenian bones are exceptionally dense, most of them lacking marrow. This adaptation is thought to help maintain neutral buoyancy. Manatees and dugongs differ in a number of traits besides the shape of the tail. Manatees lack incisor teeth, but incisors do occur in dugongs, erupting as tusks in the males.
Sep 26, 2012 · View PDF. Ecology and conservation of the sirenia: dugongs and manatees. Helene Marsh, Thomas J. O'Shea and John E. Reynolds III. Cambridge University Press, Cambridge, 2012, 521 pp, ISBN 978-0-521-88828-8, US$135, £85 (hardcover), and 978-0-521-71643-7, US$65, £43 (paperback) This 18th volume in the Cambridge series of books on Conservation ...
- H. Marsh, Thomas J. O'Shea, John Elliott Reynolds
- 2011
Jan 4, 2021 · However, there is a difference between dugong and manatee habitats. Dugongs are exclusively marine, while manatees inhabit both marine and freshwater systems. They live in swamps, rivers, estuaries, marine wetlands, and coastal marine water. Sirenians have no dorsal fin. No need, really, when you can navigate calm freshwaters instead of strong ...
The Sirenia (/ saɪˈriːni.ə /), commonly referred to as sea cows or sirenians, are an order of fully aquatic, herbivorous mammals that inhabit swamps, rivers, estuaries, marine wetlands, and coastal marine waters. The extant Sirenia comprise two distinct families: Dugongidae (the dugong and the now extinct Steller's sea cow) and Trichechidae ...
Sirenians have two flippers; manatees have three to four nails on the second, third and fourth digits, while dugongs lack nails. All sirenians lack hind limbs, and have gray-brown skin that is smooth in some species, such as Amazonian manatees, or wrinkled in others, such as West Indian manatees. Adults are between 2.8 and 3.5 meters long.
4 species. Dugongs and manatees are fully aquatic, herbivorous mammals that inhabit swamps, rivers, estuaries, marine wetlands, and coastal marine waters. They are commonly referred to as sea-cows or sirenians. Sirenians have a large, fusiform body that helps to reduce drag through the water. They have heavy bones that act as ballast to ...
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Mar 15, 2012 · Sirenia are an order of large, aquatic, plant-eating, mostly tropical placental mammals that includes the modern seacows (dugongs and manatees) and their extinct relatives. Their nearest living relatives are the Proboscidea (elephants). Together with some extinct orders (including Desmostylia and Embrithopoda), Sirenia and Proboscidea make up a ...
