also: とげあしがに
noun
flat rock crab; Percnon planissimum
Scientific/common name for a species of crab. Typically written in katakana.
磯でトゲアシガニを見つけた。
I found a flat rock crab on the rocky shore.
Compound of 棘 (toge, 'thorn') + 脚 (ashi, 'leg') + 蟹 (kani, 'crab'), referring to the crab's spiny legs. The exact derivation is uncertain.