[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Echinoderma
         Branch Ambulacrata
           Class Asteroidea Blainville, 1830 - sea stars
             Grade Ophiuræ
               Order Phytastra
                 Genus Saccocoma Agassiz, 1836