Echiurid (firefly) - Echiurid (English spelling)

Japanese: ユムシ(螠) - ユムシ(英語表記)echiurid
Echiurid (firefly) - Echiurid (English spelling)
A general term for invertebrates belonging to the phylum Echiura, or one of these species (illustration). All are marine, living in U-, J-, or irregularly shaped holes that they dig in the sand and mud of shallow seabeds, or in sand between coral reefs or in dead coral reefs. However, they have recently been found on the deep-sea floor of the North Pacific Ocean at depths of 7,000 to 10,000 meters. The body consists of a trunk and a proboscis that protrudes forward. The trunk is cylindrical or egg-shaped, and most are 8 to 10 cm long, but some can grow to about 50 cm.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
ユムシ動物門Echiuraに属する無脊椎動物の総称,またはこのうちの1種を指す(イラスト)。すべて海産で,浅い海底の砂泥中にU字状やJ字状,または不規則な形の穴を掘って,その中に生息したり,またサンゴ礁の間の砂地や死んだサンゴ礁の中などにもすむ。しかし,最近北太平洋の水深7000~1万mの深海底からも得られている。 体は体幹部とその前方に突出している吻(ふん)からなる。体幹部は円筒状や卵状で,長さ8~10cmのものが多いが,50cmほどになるものもある。

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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