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Family Neritidae

HAWAII - FRESHWATER

Neripteron vespertinus 

Left, Hau'ula, Oahu

HIHIWAI

Locally common in the lower reaches of pristine streams attached to boulders.  Threatened with extinction due to diversion of stream waters and construction of concrete stream banks.  Attains 1 inch.  Formerly known as Theodoxus vespertinus.