Benke Crab - Benke Crab

Japanese: ベンケイガニ - べんけいがに
Benke Crab - Benke Crab

This crab belongs to the family Grapsidae, class Crustacea, order Decapoda. It is a representative species of crab that has expanded its habitat from river mouths to land. It is often confused with the red-clawed crab, but this species is uniformly orange-red in color and has a deep notch at the front of the side edge of the carapace. The carapace is 3.5 cm wide and has a slightly broad rectangular outline. The center of the calyx is depressed, and there are four ridges on the line connecting the left and right eyes. The groove separating the stomach region from the heart region is clearly visible. It is distributed from Tokyo Bay through Kyushu, the Korean Peninsula, the coast of China, and Southeast Asia to India. It lives in wetlands near the coast and rarely immerses in seawater, but when the larvae are released, they soak in seawater and the larvae grow in the sea for about a month, living as plankton.

[Masamichi Takeda]

[Reference] | Crab

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

節足動物門甲殻綱十脚(じっきゃく)目イワガニ科に属するカニ。河口域から陸上へと生息域を広げているカニ類の代表種。アカテガニと混同されることが多いが、本種は一様に橙赤(とうせき)色で、甲の側縁の前方部に深い切れ込みが一つある。甲幅3.5センチメートルに達し、輪郭はわずかに幅広い四角形。額(がく)の中央部はくぼみ、左右の目を結ぶ線上に四つの稜(りょう)がある。胃域と心域を分ける溝ははっきりしている。東京湾から九州、朝鮮半島、中国沿岸を経て東南アジアからインドまで分布する。海岸に近い湿地にすみ、ほとんど海水につかることはないが、幼生の放出の際には海水に浸り、幼生は約1か月間海でプランクトン生活をして育つ。

[武田正倫]

[参照項目] | カニ

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

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