Isoyokobasami - Isoyokobasami

A marine animal belonging to the order Decapoda, class Crustacea, family Anomuraliidae. It lives in tide pools on open ocean reefs. It is found from Tokyo Bay to Okinawa and is commonly seen in various places, but not as common as the Japanese hermit crab. Its shell is gray-green. The phalanges of the walking legs are yellow at the base and tip, and black-brown in the middle and the tip of the front segment, creating a striking color contrast. The claws are bilaterally symmetrical and open and close horizontally. Coral reefs are often home to the red-striped side crab C. striolatus , which has red-brown vertical stripes on its walking legs, and the southern side crab C. corallinus , which has a uniform purple-brown body.

[Masamichi Takeda]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

節足動物門甲殻綱十脚(じっきゃく)目ヤドカリ科に属する海産動物。外洋性の岩礁の潮だまりの中にすむ。東京湾から沖縄まで分布し、各地で普通にみられるが、ホンヤドカリほど多くない。甲は灰緑色。歩脚(ほきゃく)の指節は基部と先端部が黄色、中央部と前節先端部が黒褐色という色彩の対比がよく目だつ。はさみ脚(あし)は左右相称で、はさみは水平に開閉される。サンゴ礁には歩脚に赤褐色の縦縞(たてじま)があるアカシマヨコバサミC. striolatusと、体が一様に紫褐色のミナミヨコバサミC. corallinusが多い。

［武田正倫］

出典　小学館　日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について　情報 | 凡例