A nemerte of the Acanthodidae family (illustration). It is so named because the dorsal surface of its body is green. It is found from central Honshu southwards and lives in sand and mud in the intertidal zone. Large individuals can reach a body length of 80 cm and width of 1 cm. The dorsal surface is green with no markings and the ventral surface is pale in colour. The head is spatula-shaped and flattened, with a slight depression in the centre of the anterior edge. Many eye spots are scattered inside the transverse head groove and on the dorsal edge of the head end. On the ventral surface of the head end there is a proboscis meatus opening from which the snout protrudes outwards, and a large mouth opens behind it. The distinction between the head and neck is clear. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
無針綱リネウス科の紐形動物(イラスト)。体の背面が緑色なことからこの名がある。本州中部以南に分布し,潮間帯の砂泥中にすむ。大きな個体では体長80cm,幅1cmになる。背面は緑色で斑紋はなく,腹面は淡色。頭部はへら状で扁平,前縁の中央部がややくぼんでいる。多くの眼点が頭横溝の内部と頭端との背縁に散在する。頭端腹面には吻(ふん)を外に突出する吻道口があり,その後方に大きい口が開いている。頭部と頸部(けいぶ)との区別ははっきりしている。
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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