A general term for mollusks belonging to the order Octobrachiata of the class Cephalopoda. They are found from the intertidal zone to the deep sea, and it is thought that there are about 200 to 250 species in the world, mainly from the family Octopidae. However, because they lack the hard tissues that characterize them, classification has not been established, and the exact number of species is unknown. There are about 30 to 40 species of octopus found in the seas around Japan. [structure] The body is generally muscular, but in planktonic and deep-sea species it is flexible, and in some cases gelatinous. The body consists of three parts: the trunk, head, and arms (legs). Source: Heibonsha World Encyclopedia, 2nd Edition Information |
頭足綱八腕形目Octobrachiataに属する軟体動物の総称。潮間帯から深海帯まで分布し,マダコ科を中心に世界におよそ200~250種くらいすむと思われているが,分類の形質となる硬い組織に乏しいため分類が確立しておらず,確実な種数はつかめていない。日本近海には30~40種前後のタコが分布している。 [構造] 体は一般に筋肉質に富んでいるが,浮遊性あるいは深海性の種は柔軟で,あるものは寒天様である。体は,胴,頭,腕(足)の3部分からなる。 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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