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 Spatangoida L. Agassiz, 1840
           Genus Echinocardium Gray, 1825
           Genus †Eupatagus Agassiz, 1847
           Genus †Hemiaster Desor, 1847
           Genus †Linthia Desor, 1853
           Genus Meoma Gray, 1851
           Genus Paraster Pomel, 1869