鳖
Softshell Turtle
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鳖 是对鳖科 的一类软壳龟的统称，隶属龟鳖目下的曲颈龟亚目，中文俗稱甲鱼、團魚、水鱼、泥龟、王八等。约在1.5亿年前的侏罗纪晚期发源于亚洲，并在6,000万年前的古新世中期扩散至北美洲和非洲等地，多栖息于河流、池沼、稻田等淡水生境。現存2亞科、13属、约30种，其中一些种类是现存体型最大的淡水龟鳖目动物。
资料来源 · 维基百科（CC BY-SA）
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Turtles of the family Trionychidae are called "softshell" because their carapaces lack horny scutes (scales), though the spiny softshell, Apalone spinifera , does have some scale-like projections, to which its common name refers. The carapace is leathery and pliable, particularly at the sides. The central part of the carapace has a layer of solid bone beneath it, as in other turtles, but this is absent at the outer edges. Some species also have dermal bones in the plastron, but these are not attached to the bones of the shell. The light and flexible shells of these turtles allow them to move m