新须鲸类(Cetotheres)是并系群 ， 佩罗..
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Cetotheres emerged about 15 million years ago and once occupied oceans across the globe.
MSN: Found: Whale thought extinct for 2 million years
The pygmy whale's skull most closely resembled that of an ancient family of whales called cetotheres that were thought to have gone extinct around 2 million years ago, the researchers found.
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