Clithon retropictus

Clithon retropictum is a species of freshwater and brackish water snail with an operculum, a nerite. It is an aquatic gastropod mollusk in the family Neritidae, the nerites. This species occurs in Japan: Honshu, Kyushu and Shikoku. This nerite lives in brackish water as well as freshwater. Clithon retropictum is herbivorous species. Clithon retropictum is oviparous. Juveniles hatch from eggs in September. The lifespan of Clithon retropictum is up to 12 years and it belongs among the most long-lived of freshwater gastropods.