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Family Cypraeidae

HAWAII

Cypraea (Nucleolaria) pseudonucleus 

Sharkfin, Lana'i, 25 feet, 22mm

FALSE NUCLEAR COWRY

Very rare under rocks or under ledges in shallow water.  Glossy grayish-cream to light brown, inflated with protruding extremities, large anterior canal, interrupted dorsal groove, and large nodules fairly uniform in size.  Attains nearly 1 inch.  Endemic to Hawaii.  Recently distinguished from the Indo-Pacific Cypraea (Nucleolaria) nucleus, which also occurs (rarely) in Hawaii.