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  Animalia
    Radiata
      Cnidaria
        Medusozoa
            Hydrozoa
                   [Leptolida]
              Hydroidolina
                     [Hydroida]
                    Leptothecatae
                           [Leptomedusae]
                            Haleciidae
                                     Campalecium
                                             Campalecium medusiferum
                                     Endothecium
                                             Endothecium paucinodum
                                             Endothecium reduplicatum
                                     Halecium
                                             Halecium annulatum
                                             Halecium articulosum
                                             Halecium beanii
                                             Halecium beringi
                                             Halecium bermudense
                                             Halecium capillare
                                             Halecium corrugatissimum
                                             Halecium corrugatum
                                             Halecium curvicaule
                                             Halecium delicatulum
                                                   [Halecium flexile]
                                                   [Halecium parvulum]
                                             Halecium densum
                                             Halecium diminutivum
                                             Halecium dysymmetrum
                                             Halecium exiguum
                                             Halecium expansum
                                             Halecium fasciculatum
                                             Halecium flexum
                                             Halecium fragile
                                             Halecium fruticosum
                                             Halecium groenlandicum
                                             Halecium halecinum
                                                   [Halecium gracile]
                                                   [Halecium halecium]
                                             Halecium insolens
                                             Halecium kofoidi
                                             Halecium labrosum
                                             Halecium lankesteri
                                             Halecium lenticulare
                                             Halecium macrocephalum
                                             Halecium marsupiale
                                             Halecium minutum
                                             Halecium muricatum
                                             Halecium nanum
                                             Halecium ochotense
                                             Halecium ornatum
                                             Halecium paucinodum
                                             Halecium plumosum
                                             Halecium pusillum
                                             Halecium pygmaeum
                                             Halecium reflexum
                                             Halecium regulare
                                             Halecium reversum
                                             Halecium scutum
                                             Halecium sessile
                                             Halecium speciosum
                                             Halecium telescopicum
                                             Halecium tenellum
                                             Halecium tenue
                                             Halecium undulatum
                                             Halecium vagans
                                             Halecium washingtoni
                                             Halecium wilsoni
                                     Hemitheca
                                             Hemitheca intermedia
                                     Hydrodendron
                                           [Ophiodissa]
                                             Hydrodendron alternatum
                                                   [Ophiodissa alternata]
                                             Hydrodendron carchesium
                                             Hydrodendron corrugatum
                                                   [Ophiodissa corrugata]
                                             Hydrodendron expansum
                                                   [Ophiodissa expansa]
                                             Hydrodendron gracile
                                             Hydrodendron laxum
                                                   [Ophiodissa laxa]
                                             Hydrodendron mirabile
                                                   [Ophiodissa mirabilis]
                                             Hydrodendron tottoni
                                     Mitrocomium
                                             Mitrocomium medusiferum
                                     Sagamihydra
                                             Sagamihydra dyssymetra
                                                   [Endothecium dyssymetrum]