Yuri Kimura

New fossils intensify mystery of short-lived, toothy mammals unique to ancient North Pacific

Identification of a new species of marine mammal has intensified the rare animal’s brief mysterious journey through prehistoric time.

A big, hippo-sized animal with a long snout and tusks — the new species is a marine mammal belonging to the order Desmostylia. But unlike other marine mammals alive today — such as whales, seals and sea cows — desmostylians went totally extinct. Continue reading

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Tiny teeth discovered from Inner Mongolia are new species of today’s birch mouse, rare “living fossil”

Sicista_betulina%2Ccredit%20Dodoni%20400x300.jpgTiny fossil teeth discovered in Inner Mongolia are a new species of birch mouse, indicating its ancestors are much older than previously reported, says SMU paleontologist Yuri Kimura.

The fossils were discovered in sediments that are 17 million years old, says Kimura, who identified and named the species Sicista primus. This adds millions of years to the rodent family Sicista, she said.
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