Heliocidaris crassispina A. Agassiz 1863 (formerly Anthocidaris crassispina)

Family: Echinometridae

Order: Echinoida

Locality: Japan, Muroto Promontory (Pacific), Muroto, Kochi, Rocky zone, 1m

Dimensions: 69 x 35 mm

Japanese name: Murasaki-uni

Remark: The arcs of pore pairs are separated by two tubercles.