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Family Cidaridae

HAWAII

Prionocidaris hawaiiensis 

Ewa, Oahu, 400 feet

HAWAIIAN THORNY URCHIN

Locally abundant from 250 to 700 feet.  Long tapering spines with many small thorns arranged in longitudinal rows, maroon to purple, new spines smooth & shiny.  Overall diameter of 9 inches.  Endemic to Hawaii.