also: つのながこぶし
noun
pebble crab; Leucosia anatum
A species of pebble crab; the Japanese name is typically written in katakana.
ツノナガコブシは砂浜の浅い海に生息する小さなカニです。
The pebble crab (Leucosia anatum) is a small crab that lives in shallow sandy coastal waters.
The name ツノナガコブシ literally means 'long-horned fist', likely referring to the crab's appearance. The exact derivation is uncertain.