Whale

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by yeekanger
Last updated 5 years ago

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Discipline:
Science
Subject:
Animals

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Whale

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"Whale"

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WhaleOriginal Name:hwaelClass:MammaliaOrder:CetaceaSubclass:EutheriaAppetite:Whale need to eat 50-150 kilograms of meat History:Whale became marine animals 50 million years ago Smallest whale:Harbor porpoise(Only about 1,5 meters in lenght)Biggest whale:Blue whale(Only about 30 meters in lenght)

All cetaceans, including whales, dolphins and porpoises, are descendants of land-dwelling mammals of the Artiodactyl order (even-toed ungulates). Both are related to the Indohyus, an extinct semi-aquatic deer-like ungulate, from which they split around 54 million years ago. These primitive cetaceans first took to the sea about 50 million years ago and became fully aquatic about 5–10 million years later. Their features became adapted for living in the marine environment. Major anatomical changes include streamlining of the body, the migration of the nasal openings towards the top of the cranium, the shrinking and eventual disappearance of the hind limbs, the modification of the forelimbs into flippers, and the growth of flukes on the tail.

Evolution

Cetaceans are divided into two suborders:The largest suborder, Mysticeti (baleen whales), is characterized by baleen, a sieve-like structure in the upper jaw made of keratin, which it uses to filter plankton from the water.Odontoceti (toothed whales) bear sharp teeth for hunting. Odontoceti includes dolphins and porpoises, which means that if they are considered not to be whales, the informal grouping 'whale' is not a clade.Cetaceans and artiodactyls are now classified under the super-order Cetartiodactyla, which includes both whales and hippopotami. Whales are the hippopotamus's closest living relatives.Cetaceans are divided into two suborders:The largest suborder, Mysticeti (baleen whales), is characterized by baleen, a sieve-like structure in the upper jaw made of keratin, which it uses to filter plankton from the water.Odontoceti (toothed whales) bear sharp teeth for hunting. Odontoceti includes dolphins and porpoises, which means that if they are considered not to be whales, the informal grouping 'whale' is not a clade.Cetaceans and artiodactyls are now classified under the super-order Cetartiodactyla, which includes both whales and hippopotami. Whales are the hippopotamus's closest living relatives.

Taxonomy


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