Kingdom Animalia Linnaeus, 1758 - animals Phylum Echinodermata Bruguière, 1789 - echinoderms Subphylum Eleutherozoa Bell, 1891 Class Echinoidea (Leske, 1778) - sea urchins and sand dollars Subclass Perischoechinoidea (M'Coy, 1849) Genus Cidaris Leske, 1778