Dromia dehaani (English spelling)

Japanese: カイカムリ(貝被) - カイカムリ（英語表記）Dromia dehaani

This is a large crab of the Crustacea family, Cryptodromidae, with a shell width of about 10 cm (illustration). The shell is brown, strongly raised, and densely covered with stiff short hairs. The third and fourth legs are very small and positioned on the back. It is found in the Pacific Ocean south of Tokyo Bay, where it hides on shallow rocks by carrying sponges on its back. Its Japanese name comes from the fact that it carries shells on its back, but this is not the case in the wild. In the Pacific Ocean south of the Kii Peninsula and the Indian Ocean, the even larger Dromidiopsis dormia , with a shell width of 20 cm, lives, but in rocky shores and shallow waters there are many smaller species such as Cryptodromia tumida , C. canaliculata , Petalomera fukuii , and P. wilsoni , which carry sponges or colonial ascidians on their backs.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

甲殻綱カイカムリ科のカニで，甲幅10cmほどになる大型種（イラスト）。甲は褐色で表面は強く盛り上がり，硬い短毛で密に覆われている。第3,4脚がごく小さく，背中側にかたよって位置している。東京湾以南の太平洋に分布し，浅海の岩場でカイメンなどを背負って身を隠している。和名は貝殻を背負うということからついたが，野外ではそのようなことはない。紀伊半島以南の太平洋，インド洋にはさらに大型で甲幅20cmのオオカイカムリDromidiopsis dormiaがすむが，磯や浅海にはカイメンや群体ボヤを背負っているイソカイカムリCryptodromia tumidaやミゾカイカムリC.canaliculata，フクイカムリPetalomera fukuii，ワタゲカムリP.wilsoniなど小型種が多い。

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