Sphaerium japonicum; fingernail clam
A small freshwater bivalve found in ditches and muddy streams in Japan. The name literally means 'ditch clam'.
The Sphaerium japonicum is a small bivalve that lives in irrigation ditches and similar places.
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.
Katakana spelling is common for this species name; usually written in kana.
Kanji spelling; rarely used in practice.
Alternate kanji spelling; very rare.
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.