[Kingdom] Animalia Linnaeus, 1758 - animals
Status: extant
   Grade Enterozoa
  Status: extant
     Grade Cœlomata
    Status: extant
       Phylum Echinoderma
      Status: extant
         Branch Ambulacrata
        Status: extant
           Class Asteroidea Blainville, 1830 - sea stars
          Status: extant
             Grade Ophiuræ
            Status: extant
               1 Order Ophiastra
              Status: extant
               2 Order Phytastra
              Status: extant