Home > Invertebrates > Shells > Nerites > Theodoxus cariosus

updated 11/26/2013

Family Neritidae


Theodoxus cariosus 

Eggs, Kanewai Spring, Kuli'ou'ou, Oahu

Kapoho tidepool, Hawaii


Uncommon in the lower, often brackish, section of unaltered streams attached to boulders.  Threatened with extinction due to diversion of stream waters and construction of concrete stream banks.  Shell inflated, black with white flecks and white underside.  Attains 1 inch.  Endemic to Hawaii.  Formerly known as Neritina cariosa.