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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 HELMET

Uncommon in sand deeper than 30 feet, but dead shells are common in beach drift or hermit-crabbed.  Shoulder with obsolete cornations, outer lip & columella thick, four sharp denticles along bottom of outer lip, aperture wine.  Attains at least 2.4 inches, 60 mm.  Philippines to Okinawa, Hawaii, and French Polynesia.  Formerly lumped together in Hawaii with Casmaria ponderosa.