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Whales originated from aquatic artiodactyls in the Eocene epoch of India

机译：鲸鱼起源于印度始新世的水生动植物。

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摘要

Although the first ten million years of whale evolution are documented by a remarkable series of fossil skeletons, the link to the ancestor of cetaceans has been missing. It was known that whales are related to even-toed ungulates (artiodactyls), but until now no artiodactyls were morphologically close to early whales. Here we show that the Eocene south Asian raoellid artiodactyls are the sister group to whales. The raoellid Indohyus is similar to whales, and unlike other artiodactyls, in the structure of its ears and premolars, in the density of its limb bones and in the stable-oxygen-isotope composition of its teeth. We also show that a major dietary change occurred during the transition from artiodactyls to whales and that raoellids were aquatic waders. This indicates that aquatic life in this lineage occurred before the origin of the order Cetacea.
机译：尽管鲸鱼进化的前一千万年是由一系列杰出的化石骨架记录的，但与鲸类祖先的联系却一直缺失。众所周知，鲸鱼与脚趾有蹄类动物（动蹄动物）有关，但是直到现在，形态上都没有动鲸鱼接近早期的鲸鱼。在这里，我们表明始新世的南亚脊突类拟真动物是鲸鱼的姐妹群。兜兰Indohyus在耳朵和前磨牙的结构，四肢骨骼的密度以及牙齿的稳定的氧同位素组成方面与鲸鱼相似，并且与其他偶蹄类动物不同。我们还表明，从节肢动物到鲸鱼的过渡过程中发生了主要的饮食变化，而饶腹蟹是水生涉禽。这表明该谱系中的水生生物在鲸类目的起源之前发生。

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