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Family Arcidae

HAWAII - ENDEMIC

Barbatia oahua 

Kaneohe Bay, Oahu

OAHU ARK

Rare under dead coral or rubble in shallow water within Kane'ohe Bay.  The somewhat distorted shell has coarse radiating ribs and a brown periostracum.  Attains 2.5 inches, 62 mm.  Endemic to Hawaii.  Formerly misidentified as the Indo-Pacific Barbatia decussata.