Home > Invertebrates > Sea Urchins > Actinocidaris thomasi

Updated 1/27/2013

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, about 3 inches long, test diameter 2 inches.  Endemic to Hawaii.