noun
dilate piddock (Barnea dilatata)
A species of bivalve mollusk; the name is usually written in katakana as ウミタケガイ.
ウミタケガイは潮間帯の泥の中に生息する。
The dilate piddock lives in mud in the intertidal zone.
Compound of 海 (umi, 'sea') + 茸 (take, 'mushroom') + 貝 (kai, 'shellfish'), referring to its shape. The exact derivation is uncertain.