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Organism
  Animalia
         [Metazoa]
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Asterozoa
               [Stelleroidea]
            Asteroidea
                   [Concentricycloidea]
                    Spinulosida
                      Leptognathina
                            Poraniidae
                                     Bathyporania
                                             Bathyporania ascendens
                                     Chondraster
                                           [Cheilaster]
                                             Chondraster grandis
                                     Clavaporania
                                             Clavaporania fitchorum
                                     Culcitopsis
                                             Culcitopsis borealis
                                                   [Poraniomorpha borealis]
                                     Dermasterias
                                             Dermasterias imbricata
                                     Glabraster
                                             Glabraster antarctica
                                                   [Porania antarctica]
                                     Marginaster
                                             Marginaster pectinatus
                                                   [Marginaster austerus]
                                                   [Poranisca lepidus]
                                     Porania
                                           [Gymnasterias]
                                       Porania (Porania)
                                             Porania grandis
                                             Porania insignis
                                             Porania pulvillus
                                     Poraniella
                                             Poraniella echinulata
                                             Poraniella regularis
                                     Poraniomorpha
                                           [Lasiaster]
                                           [Rhegaster]
                                           [Sphaeraster]
                                           [Sphaeriaster]
                                       Poraniomorpha (Poraniomorpha)
                                             Poraniomorpha bidens
                                             Poraniomorpha hispida
                                                   [Asterina borealis]
                                                   [Porania spinulosa]
                                                   [Poraniomorpha spinulosa]
                                             Poraniomorpha tumida
                                     Poranisca
                                     Spoladaster
                                             Spoladaster veneris
                                                   [Spoladaster brachyactis]
                                     Tylaster