Hermit crab (Yadokari) - Hermit crab (English spelling)

Japanese: ヤドカリ(宿借) - ヤドカリ（英語表記）hermit crab

A general term for crustaceans belonging to the decapod families Diogenidae, Paguridae, Parapaguridae, Coenobitidae, and Pylochelidae. Usually, they fit into snail shells because their abdomens are soft, but as they grow, they change the size of the shell they fit into. It has been observed that hermit crabs (illustration) use their claws to measure the size of the shell they fit into to match their own body size.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

十脚目ヤドカリ科Diogenidae，ホンヤドカリ科Paguridae，オキヤドカリ科Parapaguridae，オカヤドカリ科Coenobitidae，ツノガイヤドカリ科Pylochelidaeに属する甲殻類の総称。ふつうは腹部が軟らかいため，その名のように巻貝に入るが，成長につれて入る貝の大きさを変えていく。ホンヤドカリ（イラスト）では自分の体の大きさに合わせ，はさみで貝の大きさを測り入る貝を決めるのが観察されている。

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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