Kingdom Animalia Linnaeus, 1758 - animals
Phylum Echinodermata Bruguière, 1789 - echinoderms
Subphylum Echinozoa von Zittel, 1895
see Infraphylum Echinozoa Haeckel, in Von Zittell, 1895
Class Echinoidea (Leske, 1778) - sea urchins and sand dollars
Order Cassiduloida Claus, 1880
Genus †Galeropygus Cotteau, 1856
Genus †Hardouinia Archiac & Haime, 1853
Genus †Pygurus Agassiz, 1839