Pronodularia japanensis (freshwater mussel)
A species of freshwater mussel native to Japan. The name literally means 'pinecone shell' due to its appearance.
The Pronodularia japanensis is a freshwater bivalve that inhabits rivers and lakes in Japan.
Katakana spelling is common for this species name; usually written in kana.
Kanji spelling is rare; the word is usually written in kana.
From 松毬 (matsukasa, 'pinecone') + 貝 (kai, 'shellfish'), referring to the pinecone-like shape of the shell.