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Updated 10/16/2025

Family Cassidae

Helmets

Helmets live in sand and feed upon sea urchins and sand dollars.

 

HAWAII - ENDEMIC

 

 Semicassis umbilicata 

GROOVED HELMET

 

 

  

INDO-PACIFIC / HAWAII

Casmaria kayae

KAY'S HELMET

 

 Casmaria ponderosa

PONDEROUS HELMET

 
Casmaria kalosmodix

POLYNESIAN HELMET

 

Cassis cornuta

HORNED HELMET

Semicassis bulla

BUBBLE HELMET

 

Semicassis inornata

DEBI'S HELMET
Echinophoria kurodai

KURODA'S HELMET

 

 Echinophoria wyvillei

WYVILLE'S HELMET

INDO-PACIFIC

Casmaria erinaceus

COMMON BONNET