中爪兽(Mesonychids)是一群原始的有蹄哺乳类,体型与狼差不多。过去许多人相信鲸豚是从中爪兽演化出来的。
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... 狼类 Mesonychid 钝肉齿兽 MESONYCHIDS 钝肉齿兽(属);始新世之肉齿兽 Mesonyx ...
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Other features, however, show experts that Pakicetus is a transitional form between a group of extinct flesh-eating mammals, the mesonychids, and cetaceans.
然而,专家认为巴基鲸是已经灭绝的食肉哺乳动物中爪类和鲸类之间的过渡物种。
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They believed whales had descended from mesonychids.
他们认为鲸是爪兽的后裔。
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