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  Animalia
      Arthropoda
        Hexapoda
               [Apterygota]
            Insecta
              Pterygota
                Neoptera
                       [Endopterygota]
                       [Exopterygota]
                    Coleoptera
                      Polyphaga
                        Elateriformia
                          Byrrhoidea
                                 [Dryopoidea]
                            Dryopidae
                                   [Parnidae]
                                     Dryops
                                           [Parnus]
                                       Dryops (Dryops)
                                             Dryops arizonensis
                                             Dryops luridus
                                       Dryops (Yrdops)
                                             Dryops viennensis
                                     Helichus
                                           [Parygrus]
                                             Helichus basalis
                                             Helichus fastigiatus
                                                   [Parnus fastigiatus]
                                             Helichus lithophilus
                                                   [Elmis lithophila]
                                             Helichus puncticollis
                                             Helichus striatus
                                               Helichus striatus foveatus
                                                     [Helichus columbianus]
                                               Helichus striatus striatus
                                             Helichus suturalis
                                                   [Helichus suteralis]
                                             Helichus triangularis
                                     Pachyparnus
                                             Pachyparnus birmanicus
                                             Pachyparnus dicksoni
                                             Pachyparnus elegans
                                             Pachyparnus erichsoni
                                             Pachyparnus formosanus
                                             Pachyparnus gressitti
                                             Pachyparnus hardwicki
                                             Pachyparnus indicus
                                             Pachyparnus konoi
                                             Pachyparnus talpoides
                                             Pachyparnus tonkineus
                                             Pachyparnus whiteheadi
                                     Parahelichus
                                             Parahelichus angulicollis
                                             Parahelichus fenyesi
                                             Parahelichus hintoni
                                             Parahelichus koltzei
                                     Pelonomus
                                           [Oberonus]
                                           [Parnoides]
                                             Pelonomus obscurus
                                               Pelonomus obscurus gracilipes
                                               Pelonomus obscurus obscurus
                                                     [Pelonomus obesus]
                                                     [Pelonomus rufescens]
                                     Postelichus
                                           [Posthelichus]
                                             Postelichus confluentus
                                                   [Helichus confluentus]
                                                   [Posthelichus confluentus]
                                             Postelichus immsi
                                                   [Helichus immsi]
                                                   [Posthelichus immsi]
                                             Postelichus musgravei
                                             Postelichus productus
                                                   [Helichus productus]
                                                   [Posthelichus productus]
                                     Praehelichus
                                             Praehelichus asiaticus
                                             Praehelichus sericatus
                                             Praehelichus sinensis
                                             Praehelichus solskyi
                                     Stygoparnus
                                             Stygoparnus comalensis