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 ?
The whale had features typically found in modern toothed whale species that echolocate, including thickening of the bone bordering the nasal opening, cavities in the back of the snout and a broad upper jaw.
Toothed whales feed on a wide variety of prey from many habitats.
Through evolution both bats and toothed whales have developed the same functional characteristics.
The authors systematically work through the various groups of extinct and modern cetaceans, beginning with the oldest forms (archaeocetes) and continuing through different groups of baleen and toothed whales up to the present.
Echolocation, or biological sonar, is used by all the world's toothed whales such as dolphins, sperm whales and orcas.
These fish are important food for elephant seals, toothed whales and bigger fish yet the ecology and overall importance of these fish in Southern Ocean food webs remains poorly known.
Ecology lawyers Gloria Estenzo-Ramos and Liza Osorio joined Cabrido in filing the case on behalf of the dolphins, toothed whales, porpoises and other cetacean species in Tanon Strait.
Washington, March 16 ( ANI ): Researchers have said that a fossilized whale skull found outside Charleston, South Carolina shows all the tell-tales signs that are related to echolocation in today's toothed whales, dolphins, and porpoises.
AUCKLAND (CyHAN)- New Zealand scientists said Wednesday have identified a previously unknown type of fossil dolphin that could be the ancestor of modern dolphins and toothed whales.
The sperm whale is the largest of the toothed whales.
To our knowledge, the only other example of a specialized sound-producing organ in mammals that is independent of the larynx are the phonic lips that toothed whales use to generate echolocation clicks," Charlton says.
Adam Grogan, the RSPCA's senior scientific wildlife officer added: "Unfortunately scientific research from the results of post-mortems of beached toothed whales has led vets to conclude that these species have little chance of survival after stranding and that the most humane course of action is euthanasia to prevent further suffering.