This sea cucumber (illustration) is an echinoderm of the Holothuriana family, and has neither warts nor tube feet. It is found from southern Hokkaido to the Tohoku region. It is spindle-shaped, measuring about 10 cm in length, with a short tail-like rear. Its entire body is reddish-white and slightly transparent, allowing the internal organs to be seen through the torso. The surface of its body is smooth but has many horizontal wrinkles. It has 15 tentacles. Tiny confetti-like bone fragments are buried in its skin. It burrows diagonally into the sand with its anus facing upwards, and raises a small hill about 5 cm high on the sand. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
ナマコ綱イモナマコ科の棘皮(きよくひ)動物で,いぼも管足ももたないナマコ(イラスト)。北海道南部から東北地方にかけて分布する。体長10cm内外の紡錘形で,後部が短い尾のようになっている。全体は紅白色でやや透明,胴部では内臓が透けて見える。体表は滑らかであるが横じわが多い。15本の触手をもっている。皮膚の中には微小な金平糖状の骨片が埋まっている。砂中で肛門を上向きにして斜めに潜っており,砂上に高さ5cmほどの小さい丘を盛り上げる。
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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