A general term for echinoderms belonging to the order Comatulida of the class crinoids, or another name for the Japanese crinoid. All crinoids live in the sea, and are named for the 10 to 100 whorled fern-like arms they have. Commonly known as komachi. In the center of the body is a small, rounded part that houses the digestive tract, and the mouth and anus open on the top of the body. 20 to 50 root-like cirri grow from the underside of the body, and these are used to hang on to rocks and live. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
ウミユリ綱ウミシダ目Comatulidaに属する棘皮(きよくひ)動物の総称,またはニッポンウミシダの別名。ウミシダ類はすべて海産で,植物のシダの葉のような形をした腕が10~100本輪生しているところから名付けられた。俗称コマチ。体の中央にはまるくて小さい体部があって,その中に消化管が内蔵されており,口と肛門は体の上面に開いている。体の下側から20~50本も根のような巻枝が生じ,これらで岩につかまって生活する。
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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