Right-Whale Dolphin

Right-Whale Dolphin

 

any one mammal of the genus Lissodelphis of the family Delphinidae of the suborder Odontoceti (toothed whales). The body is thin and the head small. There is a low frontal process above the upper jaw; there is no dorsal fin as in the right whales (Balaenidae). The caudal peduncle is thin and low. The teeth (168–192) are sharp and thin (3 mm in diameter). Right-whale dolphins feed on cephalopod mollusks and fish.

There are two species. L. borealis measures about 2.5 m long and weighs about 70 kg. It is almost completely black. Only the chest between the fins, the part under the flukes, and a narrow band from the chest to the tail are white. It is found in the North Pacific; in the waters of the USSR it is found near the Kurile Ridge. L.peroni measures about 2.28m long and weighs about 60 kg. The abdomen is white and the flukes, back, and part of the sides are black. It is distributed in the southern hemisphere from the temperate latitudes to the antarctic.

REFERENCES

Tomilin, A. G. Kitoobraznye. Moscow, 1957. (Zveri SSSR i prelezhashchikh stran, vol. 8.)
Zhizn’zhivotnykh, vol. 6. Moscow, 1971.

A. G. TOMILIN

References in periodicals archive ?
Water depth (m) Species n Mean SD Baleen whales Humpback whale 153 144 87 Gray whale 5 20 8 Minke whale 3 106 67 Unidentified large whale 21 189 280 Unidentified whale 1 197 -- Odontocetes Dall's porpoise 90 167 118 Harbor porpoise 38 58 70 Pacific white-sided dolphin 24 689 505 Northern right-whale dolphin 1 259 -- Risso's dolphin 9 552 310 Killer whale 12 148 58 Unidentified delphinid 19 219 253 Pinnipeds and otters Harbor seal 15 102 154 Elephant seal 20 466 370 California sea lion 4 91 74 Steller sea lion 4 34 18 Northern fur seal 22 382 349 Sea otter 3 22 1 Unidentified pinniped 13 170 144 All sightings 457 205 251 Distance from shore (km) Species n Mean SD Baleen whales Humpback whale 153 43.