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Home > Invertebrates
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> Helmets
Updated 10/16/2025
Family Cassidae
Helmets
| Helmets live in sand and prey upon echinoderms, especially sea urchins
and sand dollars. They differ from tuns, being solid, forming a
broad parietal shield around the aperture, and possessing an operculum.
This is a popular family among collectors for their size, beauty, and
variety. Hawaii is comparatively poor in terms of species diversity,
and all but the Horned helmet prefer deep water. |
HAWAII - ENDEMIC
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Semicassis
umbilicata 
GROOVED HELMET |
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INDO-PACIFIC / HAWAII
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Casmaria
kayae
KAY'S HELMET
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Casmaria
ponderosa
PONDEROUS HELMET
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Casmaria kalosmodix
POLYNESIAN HELMET
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Cassis cornuta
HORNED HELMET
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Semicassis bulla
BUBBLE HELMET
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Semicassis inornata
DEBI'S HELMET
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Echinophoria kurodai
KURODA'S HELMET
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Echinophoria wyvillei
WYVILLE'S HELMET
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Phalium glaucum
GRAY HELMET
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INDO-PACIFIC
| Casmaria erinaceus
COMMON BONNET
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