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  Animalia
    Radiata
      Cnidaria
        Medusozoa
            Hydrozoa
                   [Leptolida]
              Hydroidolina
                     [Hydroida]
                    Leptothecatae
                           [Leptomedusae]
                            Phialellidae
                                     Eucope
                                     Eucopium
                                     Opercularella
                                             Opercularella hispida
                                             Opercularella humilis
                                             Opercularella lacerata
                                             Opercularella pumila
                                                   [Campanulina pumila]
                                             Opercularella rugosa
                                                   [Campanulina rugosa]
                                     Phialella
                                             Phialella annulata
                                                   [Eucope annulata]
                                             Phialella dissonema
                                                   [Saphenella dissonema]
                                             Phialella falklandica
                                             Phialella fragilis
                                                   [Eucope fragilis]
                                             Phialella hyalina
                                                   [Eucope hyalina]
                                             Phialella parvigastra
                                                   [Eucopium parvigastra]
                                             Phialella quadrata
                                                   [Thaumantias quadrata]
                                             Phialella zappai
                                     Saphenella
                                     Stegolaria
                                             Stegolaria irregularis