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  Animalia
      Arthropoda
        Hexapoda
               [Apterygota]
            Insecta
              Pterygota
                Neoptera
                       [Endopterygota]
                       [Exopterygota]
                    Coleoptera
                      Polyphaga
                        Staphyliniformia
                          Staphylinoidea
                            Hydraenidae
                                     Gymnochthebius
                                             Gymnochthebius fossatus
                                                   [Ochthebius fossatus]
                                             Gymnochthebius nitidus
                                                   [Ochthebius nitidus]
                                     Hydraena
                                             Hydraena americana
                                             Hydraena ancylis
                                             Hydraena angulicollis
                                             Hydraena appalachicola
                                             Hydraena arenicola
                                             Hydraena arizonica
                                             Hydraena atlantica
                                             Hydraena bituberculata
                                             Hydraena dinosaurophila
                                             Hydraena leechi
                                             Hydraena marginicollis
                                             Hydraena needhami
                                             Hydraena niger
                                             Hydraena nigra
                                             Hydraena occidentalis
                                             Hydraena ozarkensis
                                             Hydraena pacifica
                                             Hydraena pennsylvanica
                                             Hydraena petila
                                             Hydraena pulsatrix
                                             Hydraena punctata
                                             Hydraena spangleri
                                             Hydraena tuolumne
                                             Hydraena vandykei
                                             Hydraena youngi
                              Hydraeninae
                                     Limnebius
                                           [Limnocharis]
                                             Limnebius alutaceus
                                             Limnebius angustulus
                                             Limnebius arenicolus
                                             Limnebius borealis
                                             Limnebius columbianus
                                             Limnebius congener
                                             Limnebius coniciventris
                                             Limnebius discolor
                                             Limnebius leechi
                                             Limnebius ozapalachicus
                                             Limnebius piceus
                                             Limnebius sinuatus
                                             Limnebius texanus
                                     Neochthebius
                                             Neochthebius vandykei
                                                   [Ochthebius vandykei]
                              Ochthebiinae
                                     Ochthebius
                                           [Colalius]
                                           [Hymenodes]
                                           [Prionochthebius]
                                             Ochthebius alberti
                                             Ochthebius alpinopterus
                                             Ochthebius angularides
                                             Ochthebius apache
                                             Ochthebius arenicolus
                                             Ochthebius attritus
                                             Ochthebius aztecus
                                             Ochthebius benefossus
                                             Ochthebius bisinuatus
                                             Ochthebius borealis
                                             Ochthebius brevipennis
                                             Ochthebius bruesi
                                             Ochthebius californicus
                                             Ochthebius costipennis
                                             Ochthebius crenatus
                                             Ochthebius cribicollis
                                             Ochthebius discretus
                                             Ochthebius holmbergi
                                             Ochthebius insulans
                                             Ochthebius insularis
                                             Ochthebius interruptus
                                             Ochthebius kaszabi
                                             Ochthebius laevipennis
                                             Ochthebius lecontei
                                             Ochthebius leechi
                                             Ochthebius lineatus
                                             Ochthebius madrensis
                                             Ochthebius marinus
                                             Ochthebius martini
                                             Ochthebius milleri
                                             Ochthebius mimicus
                                             Ochthebius pacificus
                                             Ochthebius puncticollis
                                             Ochthebius putnamensis
                                             Ochthebius rectus
                                             Ochthebius rectusalsus
                                             Ochthebius reticulus
                                             Ochthebius richmondi
                                             Ochthebius sculptoides
                                             Ochthebius sculptus
                                             Ochthebius sierrensis
                                             Ochthebius similis
                                             Ochthebius spanglerorum
                                             Ochthebius tuberculatus
                                             Ochthebius tubus
                                             Ochthebius uniformis
                                             Ochthebius wickhami
                              Orchymontiinae
                              Prosthetopinae