Home > Invertebrates > Sea Urchins > Diadema savignyi

Updated 9/12/2022

Family Diadematidae

INDO-PACIFIC / HAWAII

Diadema savignyi



Taha'a, Society Islands, 5 feet


Kahe Tracks, Oahu, 30 feet

Waianae, Oahu, 50 feet


Five Caves, Makena, Maui, 40 feet
   

BLUE-LINED LONG-SPINE URCHIN

Locally abundant on reefs with good water circulation.  Spines black in adults, juveniles tend to be a mixture of unbanded white and brown spines, always with neon blue lines.  Test attains 3 inches, spines 8 inches.  Thin venomous spines protected by thicker primary spines.  Red Sea to Okinawa and Easter Island.  It appears to be an accidental introduction to Hawaii after the 1990's.