A decapod crustacean of the spider crab family (illustration). This crab is found widely from Tokyo Bay to the Indian Ocean, living on muddy sandy bottoms at depths of 20 to 50 meters, and camouflages itself by attaching trash and sponges to its shell. This appearance is why it got the name "cotton dust." The carapace is a long, rounded rectangle, about 3 cm long. Its color ranges from gray to black-brown, reflecting where it lives. The stomach, heart, and gill regions are clearly separated, each covered with fine granules, and each granule has hook-shaped hairs. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
十脚目クモガニ科の甲殻類(イラスト)。東京湾からインド洋まで広く分布するカニで,水深20~50mの泥まじりの砂底にすみ,甲羅にごみやカイメンなどをつけてカムフラージュしている。このようすから綿屑の名がついた。甲は丸みをおびた縦長の四角形で,甲長約3cm。すんでいる場所を反映し,灰色~黒褐色をしている。胃域,心域,鰓域(さいいき)が明りょうに分けられ,それぞれ細かい顆粒(かりゆう)におおわれ,各顆粒にはかぎ形の毛がはえている。
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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