A worm of the family Echinodermata. It is found in the Sea of Okhotsk north of Akkeshi in Hokkaido, the northeast coast of North America, and the waters of Iceland. It is about 10 cm long and 2.5 cm wide, and is grayish-white to yellowish-gray in color, although larger ones are reddish. Small dermal papillae are arranged in a ring shape on the surface of the body. A spatula-shaped snout about 2 cm long extends from the end of the head, and there is a pair of abdominal setae behind the mouth that opens downward. There are also 11 tail setae on the outside and 8 on the inside surrounding the anus at the rear end of the body. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
キタユムシ科のユムシ動物。北海道の厚岸以北のオホーツク海,北アメリカ北東岸,アイスランド海域に分布する。体長10cm,体幅2.5cm内外,灰白~黄灰色であるが,大型のものは紅色を帯びている。体表には小さい皮膚乳頭がほぼ輪状に並んでいる。頭端からは長さ2cmほどのへら状の吻(ふん)がで,その下方に開く口の後方に1対の腹剛毛がある。また,体後端にある肛門をとり巻いて,外側に11本,内側に8本の尾剛毛が並んでいる。
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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