flotsam crab (Planes cyaneus)
A species of crab that lives on floating objects in the open ocean. Scientific name: Planes cyaneus.
The flotsam crab drifts by clinging to driftwood or seaweed.
Katakana spelling is common for this organism name; usually written in kana.
Kanji spelling is rare; the word is usually written in kana.
The name literally means 'offshore drifting crab', from 沖 (offshore), 流れ (drifting), and 蟹 (crab).