Cidaris species 2

Family: Cidaridae

Order: Cidaroida

Locality: Philippines, Siquijor, 250-300 feet, 2006

Dimensions: 48 mm , longest spine 65 mm

Surely a Stereocidaris. Differs from Stereocidaris granularis by the tapering, at the distal end not widening spines with longitudinal ridges and the colour.