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 ?
Accounting for these mixed-species groups, the 379 group sightings represent 398 sightings of 23 species (17 odontocetes and 6 mysticetes) and 13 unidentified species categories (Table 1).
Quantitative analysis of tonal calls from five odontocete species, examining interspecific and intraspecific variation.
Social parasitism has been commonly documented among terrestrial animals (for example, Sumner and others 2004; Dietemann and others 2006), but is inherently difficult to document among at-sea odontocetes that spend the majority of their lives below the ocean surface.
The teeth of odontocetes vary in shape and number, based on the dietary preferences of the particular species.
Unexpectedly, Milinkovitch and his co-workers found that sperm whales did not group with the other Odontocetes.
Social and behavioural factors in cetacean responses to overexploitation: are odontocetes less "resilient" than mysticetes?
Odontocetes We encountered 16 species of odontocetes, with sufficient sightings of 8 species to calculate seasonal abundance and density and examine seasonal trends.
1984: Fossil odontocetes (Mammalia: Cetacea) from the Almejas Formation, Isla Cedros, Mexico.
Distribution and habitat partitioning by small odontocetes in the Gully, a submarine canyon on the Scotian Shelf.
Neoplasia was not observed in 86 small odontocetes stranded on the Oregon and California shoreline (20,21).
6% (31) of the strandings were from odontocetes (toothed "whales") and 8.
Pinnipeds and coastal odontocetes have received particular attention given their high contaminant loading and the recent occurrence of population disturbances that have involved disease or declines in reproductive ability, or both (Marine Mammal Commission 1999).