Home > Invertebrates > Bivalves > Calloarca tenella

Updated 8/20/2025

Family Arcidae

INDO-PACIFIC / HAWAII

Calloarca tenella

Kaupo, Oahu, 10 feet

 

SMOOTH ARK

Uncommon under stones at any depth.  Shells are covered with thin periostracum.  Attains 1 inch.  Red Sea to Hawaii and the Tuamotus.  Formerly known as Barbatia tenella.