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Created 12/25/2025

Family Cymatiidae

WEST PACIFIC / HAWAII

Monoplex gemmatus



Calituban, Bohol, Philippines, 50 feet, 30 mm

 

GEM TRITON

Very rare in Hawaii but fairly common elsewhere under stones in shallow water.  Fairly slender and lightly sculptured, pale orange or brown, with scattered brown and white marks on varices, aperture white, columella with white teeth.  Attains 1.4 inches, 35 mm.  Philippines to Hawaii and the Austral Islands.  This name was once applied to Monoplex mundus, as Cymatium gemmatum, before study showed that both species are valid and present in Hawaii