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Updated 10/16/2025

Family Cassidae

WEST PACIFIC / HAWAII

Casmaria kayae



Oahu.  @ David Watts


Oahu. @ Padgett Carpenter
 
 

Kahe Point, Oahu, 35 feet

 


@ Padgett Carpenter
   

KAY'S BONNET or HELMET

Uncommon in sand deeper than 30 feet, but dead shells are common in drift or hermit crabbed.  Shoulder with obsolete cornations, outer lip & columella thick, four sharp denticles along bottom of outer lip, aperture wine.  Attains 2.5 inches.  Philippines to Okinawa, Hawaii, and French Polynesia.  Formerly lumped together in Hawaii with Casmaria ponderosa.