Clithon retropictus (von Martens, 1879)
Distribution:
Reported from Japan and Korea to Thailand. Occurrence south of Taiwan is questionable and all specimens examined were from Japan or Taiwan. Two specimens examined from an old collection (collected in the 1930s) were purportedly from Borneo, but this could not be confirmed.
Habitat:
Brackish to fresh water in small streams and rivers on algae covered stones and on vegetation stalks.