Neritina oualaniensis Lesson, 1831 Clithon oualaniensis [sic] (incorrect gender ending) Theodoxus oualaniense (Lesson, 1831) Pictoneritina oualaniensis (Lesson, 1831) Clithon oualaniense[3] is a species of brackish water[4] snail with an operculum, a nerite.

This species occurs in Indo-Pacific region: Nansei-shoto in Japan, Hong Kong, Thailand, Peninsular Malaysia, Singapore, Jawa in Indonesia, Philippines, Papua New Guinea, Queensland in Australia[1] India[5] and Ceylon.

[7] It also inhabits sea grass bed with Zostera japonica.

[8] It bury itself into the mud, when the tide is high, probably to avoid water predators.

[9] Clithon oualaniense is herbivorous, feeding of microalgae and on detritus.