An annelid of the Polychaeta family, Polytrichum commune (illustration). It is so named because it has long, upright setae like those of a caterpillar. It is widely distributed from central Honshu southwards. Its body is spindle-shaped and about 7-8 cm long, but some can reach 15 cm. It has 30-40 ring segments, and on the back of each segment there is a row of oval purple spots along the midline, and on both sides of the spots there are densely branched, leaf-like gills. The head is small and has five purple-brown tentacles, one pair of accessory tentacles, and two pairs of eyes. On both sides of each segment there are dorsal and ventral setal bundles. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
多毛綱ウミケムシ科の環形動物(イラスト)。毛虫のように長い剛毛をさかだてることからこの名がある。本州中部以南に広く分布する。体は紡錘形で,長さ7~8cmくらいであるが,15cmになるものもある。環節は30~40あり,各節の背面には正中線上に楕円形の紫色の斑紋が1列に並び,斑紋の両側には密に枝分れした木の葉状のえらがある。頭部は小さく,紫褐色の5本の感触手,1対の副感触手,2対の眼などがある。各節の両側には背剛毛束と腹剛毛束とがある。
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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