Sharkfin, Lana'i, 25 feet, 22mm

Very rare in caverns or under slabs deeper than 20 feet.  Glossy cream to brown, inflated with protruding extremities, distinct marginal callous, prominent dorsal groove nearly centered, large granules joined by ridges on left side extending onto base.  Attains 1 inch.  Endemic to Hawaii.  This is a hybrid between endemic Nucleolaria granulata and Indo-Pacific Nucleolaria nucleus.  It was described in Severns, 2011 as Nucleolaria hinuhinu.