Very rare in caverns or under slabs exposed to surge from 10 to 40 feet.  Glossy grayish-cream to light brown, inflated with protruding extremities, smaller granules mostly uniform in size, connected by ribs extending to the base, both edged with orange-brown, marginal callous barely developed, indistinct dorsal groove skewed to the side.  Attains 1 inch.  Endemic to Hawaii.  This is a hybrid between Indo-Pacific Nucleolaria nucleus and endemic Nucleolaria granulata.  It was described in Severns, 2011 as Nucleolaria pseudonucleus.