Sirenian
Related Category: Vertebrate Zoology
(sr´nn) or sea cow, name for a large aquatic mammal of the order Sirenia.
Category:Sirenians
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Sirenians are slow and passive mammals of tropical and sub-tropical waters. Their large thick bodies betray their heritage as relatives of elephants.
Sirenians, or seacows, are a group of marine mammals that include manatees and dugongs; Today, only one species of seacow is found in each world region. Scientists have discovered ... > full story ...
Sirenians are members of the group known as subungulates, thought to be distantly related to hyraxes, elephants, and perhaps, artiodactyls and perissodactyls.
Types of Sirenians - Sirenian Types
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All species of sirenians are protected to some extent by national or local acts in every country they inhabit.
Like all modern sirenians, the dugong has a fusiform body with no dorsal fin or hind limbs, instead possessing paddle-like forelimbs used to manoeuvre.
It is with the proboscidean suborder of the Ungulata to which the Sirenia are most nearly related; the nature of this relationship being described by Dr Andrews as follows: " In the first place, the occurrence of the most primitive Sirenians with ...
Chapter Headings include: 1) Introduction; 2) Systematics and Classification; 3) Pinniped Evolution and Systematics; 4) Cetacean Evolution and Systematics; 5) Sirenians and other Marine Mammals: Evolution and Systematics; 6) Evolutionary Biogeography; ...
Although superficially they resemble whales, sirenians have evolved independently. They are thought to be descended from the group of ancient land mammals that also gave rise to the elephants.
World Range & Habitat ...
The Sierra Club Handbook of Seals and Sirenians, by Randall R. Reeves, Brent S. Stewart, and Stephen Leatherwood; Sierra Club Books, 1992.
The Natural History of Seals, by W. Nigel Bonner, Facts on File, 1990.
Reeves, R.R., Stewart, B.S. and S. Stephen. The Sierra Club Handbook of Seals and Sirenians. San Francisco: Sierra Club Books, 1992.
Ridgway, S.H. and R.J. Harrison (Eds). Handbook of Marine Mammals: Volume 2: Seals. London. Academic Press, 1981.
It has a barrel-shaped body covered in coarse gray skin and front flippers with tiny nails. Like all sirenians, it has no hind limbs and swims with its spoon-shaped tail, which slowly beats up and down as it cruises through the shallows.
Of these, seven have been extirpated, three unsuccessfully introduced, and five seals and one sirenian recognized as vagrants, leaving 60 mammals (exclusive of 28 cetaceans) potentially present in the state.
They include the cetaceans (whales and dolphins), pinnipeds (seals, sea lions, and walrus), sirenians (manatees and dugongs), sea otters, and even the polar bear.
African manatee (Trichechus senegalensis)
The African manatee is the least known of all the Sirenians; the unique group of manatees and dugongs that are the only herbivorous marine... More 2 Images 0 videos ...
Nor is the aardvark closely related to the South American anteater, despite sharing some characteristics and a superficial resemblance. The closest living relatives of the aardvark are the elephant shrews, along with the sirenians, hyraxes, tenrecs, ...
 See also: Siren, Dugong, Manatee, Elephant, Diver
  
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