...All sea creatures live in the ocean, from the intertidal zone to the deep sea floor at depths of several thousand meters, but a very small number of species live a planktonic life in the deep sea. Due to their overall shape, they are called sea cucumbers or sea sausages. In general, echinoderms have a pentad-shaped body, but sea cucumbers have an elongated, cylindrical body between the mouth and anus, and have a distinction between anterior-posterior and dorso-ventral, giving them secondary bilateral symmetry. *Some of the terminology that mentions "sea sausage" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…すべて海産で,潮間帯から水深数千mの深海底まですむが,ごく少数の種類は深海で浮遊生活をしている。全体の形からsea‐cucumber(海のキュウリ),sea‐sausage(海のソーセージ)の英名がある。一般に棘皮動物の体は5放射相称形であるが,ナマコ類は口と肛門との間がのびて円筒状になり,前後と背腹の区別ができて二次的に左右相称になっている。… ※「sea-sausage」について言及している用語解説の一部を掲載しています。 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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