海蛇函

海蛇函是一类已灭绝的棘皮动物。身体呈穹窿状，口在下面中央，自口中伸出八对覆有骨板的管足（一说是腕）。存在大型骨板结构。海蛇函纲（Ophiocistioidea）在分类上属于海胆亚门。

单词	Ophiocistioidea
释义	Ophiocistioidea 中文百科海蛇函海蛇函是一类已灭绝的棘皮动物。身体呈穹窿状，口在下面中央，自口中伸出八对覆有骨板的管足（一说是腕）。存在大型骨板结构。海蛇函纲（Ophiocistioidea）在分类上属于海胆亚门。英语百科 Ophiocistioidea 海蛇函 The Ophiocistioidea is a class of extinct echinoderms from the Palaeozoic. Ophiocistioids had a flattened dome-shaped body encased in a solid test of calcareous plates, similar to that of a modern sea urchin. The mouth was at the apex of the dome, and surrounded by a set of five jaws. The animals apparently did not have an anus, but a madreporite was on the upper surface, surrounded by what appear to be genital pores for the release of gametes.
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Ophiocistioidea