Home > Invertebrates > Sea Urchins > Actinocidaris thomasi

Family Cidaridae

HAWAII

Actinocidaris thomasi 

Pitt Stop, Midway Atoll, 50 feet

 

Sharks Cove, Oahu, 30 feet

Sea Cave, Oahu, 50 feet

 THOMAS' URCHIN

Rare in caverns at scuba depths.  Spines are finely granulated.  Overall diameter of 6 inches.  Endemic to Hawaii.