[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Echinoderma
         Branch Ambulacrata
           Class Asteroidea Blainville, 1830 - sea stars
             Grade Asteriæ
               Order Colastra
                 1 Genus Uraster Agassiz, 1836, nom. illeg.
                 2 Genus Solaster Forbes, 1839 - sun star
                 3 Genus Astropecten Schultze, 1760