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  Animalia
    Bilateria
     Deuterostomia
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Asterozoa
               [Stelleroidea]
            Asteroidea
                    Velatida
                            Myxasteridae
                                   [Pythonasteridae]
                                     Asthenactis
                                             Asthenactis australis
                                             Asthenactis fisheri
                                             Asthenactis papyraceus
                                     Myxaster
                                             Myxaster medusa
                                                   [Asthenactis medusa]
                                             Myxaster perrieri
                                             Myxaster sol
                                     Pythonaster
                                             Pythonaster atlantidis
                                             Pythonaster murrayi
                                             Pythonaster pacificus