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Updated 8/20/2025

Family Modiolidae

CENTRAL PACIFIC / HAWAII

Modiolus matris

Kaupo, Oahu, Hawaii

 

MOTHER'S MUSSEL

Uncommon under stones in 15 to 30 feet.  Broadly rhomboidal, orange-brown to red with thin hairy periostracum.  Fine concentric growth rings.  Attains 0.5 inch, 12 mm.  Restricted to the Hawaiian and Phoenix Islands.