Stereopneustes relictus de Meijere 1902 ??
Family: Corystidae	Order: Holasteroida
Locality: Philippines, Siquijor, 250-300 feet, 2006	Dimensions: 86 x 81 x 55 mm
I do not exactly know, if the taxon is correct, but colour and shape match very well the description given in Sea urchins from Heinke Schultz, page 365, namely the dark purplish colour, the not sunken ambulacra and the inframarginal periproct touching the slightly undercut margin.