Odontoceti

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Odontoceti

[ō‚dänt·ə′sē‚tī]
(vertebrate zoology)
The toothed whales, a suborder of cetacean mammals distinguished by a single blowhole.

Odontoceti

 

(toothed whales), a suborder of aquatic mammals of the order Cetacea. The body of a toothed whale is 1.2–20 m long. In distinction to Mysticeti, it has from two to 240 teeth. There is one nasal opening at the top of the head. The lower jaws are shorter than the skull and are joined in front. Toothed whales orient themselves mainly by means of echolocation. The formation of the echolocation apparatus, with its system of air sacs, has caused skull asymmetry in toothed whales. They have highly developed hearing, and a sound signal and voice organ linked with the nasal passage. Toothed whales live in all seas and oceans. The suborder Odontoceti comprises four families: Physeteridae (two species: sperm whale and pygmy sperm whale), Platanistidae (four species), Ziphiidae (17 species), and Delphinidae (50 species). The waters of the USSR contain 23 species (belonging to 20 genera). Toothed whales reach sexual maturity between two and six years of age. Their food consists offish, cephalopod mollusks, and crustaceans. The most important for man are the sperm whale, bottle-nosed dolphin, common dolphin, harbor porpoise, white whale (beluga), killer whale, and blackfish. They are sought for industrial oil, spermaceti, and meat. The number of many species has sharply decreased, and some Odontoceti species have been placed under protection.

REFERENCES

Tomilin, A. G. Kitoobramye. Moscow, 1957. (Zveri SSSR i prilezhashchikh stran, vol. 9.)
Tomilin, A. G. Kitoobraznye fanny morel SSSR. Moscow, 1962.
Zhizn’ ihivotnykh, vol. 6. Moscow, 1971.

A. G. TOMLIN

References in periodicals archive ?
Unexpectedly, Milinkovitch and his co-workers found that sperm whales did not group with the other Odontocetes.
Live strandings accounted for 15% of all strandings; more than 41% of pelagic odontocetes (40% of delphinids, 52% of Kogia spp.
Interspecific investigations of odontocete behavioral ecology are rare (Polacheck 1987; Seizer and Payne 1988; Shane 1994; Gowans and Whitehead 1995) and no such studies have been conducted in the Southern California Bight.
Prey preferences among the community of deep-diving odontocetes from the Bay of Biscay, Northeast Atlantic.
Genetic analysis of population structure of the market squid, Loligo opalescens, a common prey species of many of the odontocetes described here, suggests a north and south migration within shelf waters (Reichow and Smith, 2001) as well as inshore and offshore movements during the spawning season (Spratt, 1979).
Among the odontocetes, four (Ziphidae, Pontoporiidae, Phocoenidae, and Delphinidae) out of the eight families present RSSD.
In some cases cetaceans could only be identified as large whales (>7 m long), small whales (nondolphin, <7 m), dolphins, or odontocetes.
During the past decade, both aerial and shipboard assessment surveys in the oceanic ([is greater than] 200 m depth) northern Gulf have identified and characterized the abundance and distribution of 20 species of cetaceans, all but one of which were odontocetes (Mullin et al.