Animalia Linnaeus, 1758 - animals
   Enterozoa
     Cœlomata
       Echinoderma
         Ambulacrata
           Asteroidea Blainville, 1830 - sea stars
             Ophiuræ
               Phytastra
                 1 Euryale Lamarck, 1816
                 2 Saccocoma Agassiz, 1836