Hydatina amplustre (Linnaeus, 1758)
The delicate white animal inhabiting this spirally banded pink and white shell is too large to fit entirely inside. Active only at night, it can be found at depths of 1-2 ft. in areas of mixed sand and rock with good water circulation. Hermit crabs inhabiting the distinctive shells are a daytime clue to its presence. The species feeds on small, colorful bristle worms of the family Cirratulidae. Some specialists place it and the two species below in the order Acteonoidea. The species name means "large" or "swollen." To about 3/4 in. Indo-Pacific.
Photo: Black Point, O`ahu. 1 ft.
Hawaii's Fishes, a Guide for Snorkelers, Divers and Aquarists Mutual Publishing, 1993
Hawaii's Underwater Paradise, Mutual Publishing, 1997
Hawaii's Sea Creatures, a guide to Hawaii's Marine Invertebrates. Mutual Publishing, 1999.
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