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How Snakes Lost their Legs

机译:蛇如何失去双腿

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There are nearly 500 genera comprising almost 3,000 named species of snakes. Yet, till recently, surprisingly little was known about the ultimate origin of snakes. It was once believed that snakes evolved from marine reptiles with a slender body and lack of legs serving as adaptations to move through a watery home. However, recent fossil discoveries point to a probable origin of snakes from land-dwelling, burrowing reptiles. Sometime ago, the discovery of a four-legged fossil snake dubbed Tetrapodophis amplectus (literally, four-legged snake) in Brazil gave the first clue to how snakes may have evolved from lizards. Estimated to be 113 million years old, it was the oldest snake fossil on record and looked almost like a modern snake, except for one glaring difference; it had four tiny limbs, each with five digits (Dream 2047, October 2015).
机译:有近500属,包括近3,000种命名的蛇。然而,直到最近,人们对蛇的最终起源知之甚少。曾经有人认为蛇是从海洋爬行动物进化而来,身体细长,没有腿,可以适应流水般的家。但是,最近的化石发现表明,蛇可能是从陆栖爬行的爬行动物中起源的。不久前,在巴西发现了一条四足化石蛇,称为四足蛇(Tetrapodophis amplectus)(字面意思是四足蛇),这为蛇如何从蜥蜴进化出了第一个线索。估计有1.13亿年的历史,它是有史以来最古老的蛇化石,除了一条明显的区别外,它看起来几乎像一条现代蛇。它有四个微小的肢体,每个肢体都有五个数字(Dream 2047,2015年10月)。

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    《Science and Culture》 |2016年第4期|120-121|共2页
  • 作者

    Biman Basu;

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