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Whale of a change for cetacean history. (research indicates that Odontocetes and Mysticetes do not represent true evolutionary lines) (Brief Article)

A new study of DNA sequences has badly shaken the standard family tree of cetaceans, suggesting intriguing new twists in whales' evolutionary history.

Taxonomists divide living whales and dolphins into two suborders: the Odontocetes, which have teeth, and the Mysticeres, whose mouths have banks of comb-like baleen used to filter small fish and crustaceans from the water. Odontocetes, which include the sperm whale, can track prey through the remarkable evolutionary adaptation of "echolocation" -- a sonar system that emits sounds and senses the echoes bouncing off objects. Mysticetes, such as the blue whale, lack the ability to echolocate.

Paleontologists have long ...

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