striped shore crab
Refers specifically to the species Pachygrapsus crassipes, a common intertidal crab.
I often see striped shore crabs on the rocky shore.
Usually written in katakana; the kanji form 岩蟹 is rare.
Kanji spelling is uncommon; the word is normally written in kana.
Compound of 岩 (iwa, 'rock') and 蟹 (kani, 'crab'), referring to its rocky shore habitat.