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  Animalia
    Bilateria
     Deuterostomia
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Crinozoa
            Crinoidea
                   [Eucrinoidea]
              Articulata
                    Comatulida
                      Macrophreata
                            Antedonidae
                                     Antedon
                                             Antedon bifida
                                             Antedon petasus
                                     Florometra
                                             Florometra asperrima
                                             Florometra serratissima
                                                   [Florometra perplexa]
                                     Hathrometra
                                             Hathrometra prolixa
                                             Hathrometra sarsii
                                             Hathrometra tenella
                                     Heliometra
                                             Heliometra glacialis
                                               Heliometra glacialis glacialis
                                               Heliometra glacialis maxima
                                     Hypalometra
                                             Hypalometra defecta
                                     Leptometra
                                             Leptometra celtica
                                     Psathyrometra
                                             Psathyrometra fragilis
                                                   [Psathyrometra borealis]
                                     Retiometra
                                             Retiometra alascana
                                     Stylometra
                                             Stylometra spinifera