They were thrilled to discover a perfectly preserved specimen of Roman pottery.

他们因发现了一件保存完好的罗马时代陶器而欣喜若狂。

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But finding such a complete snake fossil is rare, with only a half-dozen well-preserved specimen from this period.

然而极少能找到这样完整的蛇化石，这一时期保存完好的标本只找到6件。

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Jenny Haniver is the carcass of a ray or a skate which has been modified and subsequently dried, resulting in a grotesque preserved specimen.

它是一种鳐鱼的尸体，经过特别的处理和干燥后，变成了这种怪异的样子，还有人说它是美人鱼的标本。

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And knowing the rate at which neutral mutations accumulate in most animal species, the 50% figure suggests that the first asexual rotifer lived about 80m years ago twice as far back as the oldest known fossil bdelloid, a 40m-year-old specimen preserved in amber.

ECONOMIST: The longest ��headache�� ever

Crucially, 62000 has a reasonably well-preserved upper jaw, which the type specimen lacks.

ECONOMIST: Human ancestry has just got more complicated