noun
Sphaerium japonicum; fingernail clam
A small freshwater bivalve found in ditches and muddy streams in Japan. The name literally means 'ditch clam'.
ドブシジミは用水路などに生息する小さな二枚貝です。
The Sphaerium japonicum is a small bivalve that lives in irrigation ditches and similar places.
子どもの頃、田んぼのそばでドブシジミをよく見かけた。
When I was a child, I often saw fingernail clams near the rice paddies.
シジミ (Corbicula japonica) is a larger, edible freshwater clam commonly used in miso soup, while ドブシジミ is a tiny, non-edible species.
Compound of どぶ (ditch, muddy water) and しじみ (freshwater clam). The kanji 溝 (ditch) and 蜆 (clam) reflect the meaning, but the word is usually written in kana.