A general term for echinoderms belonging to the class Ophiuroidea, or one of these species. Ophiuroidea are widely distributed in oceans around the world, living from the intertidal zone to depths of about 6,000 m. Their external and internal structure is quite different from that of starfish. Five long, slender arms emerge from a small disk in the center of the body, with clearly defined boundaries. The surfaces of the disk and arms are covered with small calcareous plates arranged like scales. They have a mouth in the center of the underside of the disk, and rows of hard bone teeth around and at the back of the mouth. They eat garbage and small animals that accumulate on the seabed, but some species can swallow bivalves and snails whole. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
クモヒトデ綱Ophiuroideaに属する棘皮(きよくひ)動物の総称,またはそのうちの1種を指す。クモヒトデ類は世界中の海に広く分布し,潮間帯から6000mくらいの深さまですむ。ヒトデ類とは体の外部,内部構造ともに形態がかなり異なっている。体の中央にある小さい盤から細長い5本の腕を出し,その境界ははっきりしている。盤や腕の表面は小さな石灰質の板がうろこのように並んでいる。盤の下面中央に口があり,口の周囲と奥のほうに硬い骨片の歯が並んでいて,海底に積もっているごみや小さい動物を食べるが,二枚貝や巻貝を丸のみにする種類もある。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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