†Opissaster (heart urchin)
Echinoidea - Spatangoida - Hemiasteridae
Parent taxon: Hemiasteridae according to A. G. Fischer 1966
Sister taxa: Cheopsia, Crucibrissus, Distefanaster, Ditremaster, Hemiaster, Hernandezaster, Heterolampas, Holcopneustes, Hypsopatagus, Isopetalum, Palhemiaster, Psephoaster, Vomeraster, Washitaster
Subtaxa: Opissaster herrerae
Ecology: slow-moving shallow infaunal deposit feeder-detritivore