Brisaster species (antarcticus Doederlein?)

Family: Schizasteridae

Order: Spatangoida

Locality: South Georgia Island, sub-antarctic, deep water, 2008

Dimensions:
52,3 x 46,3 x 29 mm

 

I got this specimen without taxon, but I think, it is a Brisasster species, probably Brisaster antarcticus Doederlein.