A general term for annelids belonging to the order Terebellida of the class Polychaeta. This name comes from the tuft of numerous thread-like tentacles at the end of the head. They hide under boulders on the coast or in rock crevices, but some live on the muddy bottom of the deep sea. There are about 650 known species worldwide, and 60 known in Japan. Body length is 3-10 cm, with 100-250 segments. The body is divided into three parts: the head, thorax, and abdomen, and is almost cylindrical, thickened at the front and tapering toward the back. The thorax consists of 10-20 setae, and has 2-3 pairs of thread-like or dendritic gills at the front. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
多毛綱フサゴカイ目Terebellidaに属する環形動物の総称。頭端にある多数の糸状感触手が房状になっているところからこの名がある。海岸の転石の下や岩の割れ目などに潜っているが,深海の泥底にすむものもある。世界で約650種,日本には60種知られている。体長3~10cm,環節数100~250。体は頭部,胸部と腹部の3部分にわかれ,ほぼ円筒状で前部が肥厚し,後方になるにつれて細くなる。胸部は10~20剛毛節からなり,前方には糸状または樹枝状のえら(鰓)が2~3対ある。
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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