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  Animalia
      Arthropoda
            Insecta
                    Coleoptera
                            Helodidae
                                     Hydrocyphon
                                             Hydrocyphon japonicus
                      Polyphaga
                        Elateriformia
                          Scirtoidea
                                 [Eucinetoidea]
                            Scirtidae
                                   [Helodidae]
                                     Cyphon
                                           [Contacyphon]
                                             Cyphon americanus
                                             Cyphon arcuatus
                                             Cyphon brevicollis
                                             Cyphon coarctatus
                                             Cyphon collaris
                                             Cyphon concinnus
                                             Cyphon confusus
                                             Cyphon cooperi
                                             Cyphon exiguus
                                             Cyphon koebelei
                                             Cyphon modestus
                                             Cyphon nebulosus
                                             Cyphon obscurus
                                             Cyphon padi
                                             Cyphon perplexus
                                             Cyphon punctatus
                                             Cyphon pusillus
                                             Cyphon robustus
                                             Cyphon ruficollis
                                             Cyphon variabilis
                                     Elodes
                                           [Hemicyphon]
                                           [Sacodes]
                                             Elodes angusta
                                             Elodes apicalis
                                             Elodes aquatica
                                             Elodes emarginata
                                             Elodes fuscipennis
                                             Elodes impressa
                                             Elodes maculicollis
                                             Elodes nunenmacheri
                                             Elodes pulchella
                                             Elodes thoracica
                                     Helodes
                                             Helodes angusta
                                             Helodes aquatica
                                             Helodes emarginata
                                             Helodes maculicollis
                                             Helodes pulchella
                                             Helodes thoracica
                                     Microcara
                                             Microcara explanata
                                     Ora
                                             Ora discoidea
                                             Ora hyacintha
                                             Ora texana
                                             Ora troberti
                                     Prionocyphon
                                             Prionocyphon discoideus
                                             Prionocyphon limbatus
                                             Prionocyphon serricornis
                                     Prionoscirtes
                                             Prionoscirtes dilaticornis
                                     Sarabandus
                                             Sarabandus robustus
                                     Scirtes
                                             Scirtes californicus
                                             Scirtes championi
                                             Scirtes grandis
                                             Scirtes humeralis
                                             Scirtes orbiculatus
                                             Scirtes ovalis
                                             Scirtes piceolus
                                             Scirtes plagiatus
                                             Scirtes tibialis