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Toxopneustidae : ウィキペディア英語版 | Toxopneustidae
Toxopneustidae is a family of globular sea urchins in the class Echinoidea. ==Characteristics== All Camarodonts have imperforate tubercles and compound ambulacral plates. In addition, the Toxopneustids are characterised by the peristome, or opening through the test, having a sharp margin with the buccal notches being prominent. The tubercles lack the crenulations or ring of cog-like structures that articulate with the spines in certain other families. The Aristotle's lantern, or jaw apparatus, has the keeled teeth and the epiphyses united above the foramen magnum, the V-shaped gap between the hemipyramids that support the lantern's tooth.〔(The Echinoid Directory ) The Natural History Museum. Retrieved 2011-08-27.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Toxopneustidae」の詳細全文を読む
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