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  Animalia
      Arthropoda
        Hexapoda
               [Apterygota]
            Insecta
              Pterygota
                Neoptera
                       [Endopterygota]
                       [Exopterygota]
                    Coleoptera
                      Polyphaga
                        Staphyliniformia
                          Hydrophiloidea
                            Helophoridae
                                   [Helophorinae]
                                     Helophorus
                                           [Elophorus cinctus]
                                           [Elophorus]
                                       Helophorus (Gephelophorus)
                                             Helophorus sibiricus
                                       Helophorus (Helophorus)
                                             Helophorus aquaticus
                                             Helophorus grandis
                                       Helophorus (Kyphohelophorus)
                                             Helophorus tuberculatus
                                       Helophorus (Orphelophorus)
                                             Helophorus arcticus
                                       Helophorus (Rhopalohelophorus)
                                             Helophorus alternatus
                                             Helophorus angusticollis
                                             Helophorus artus
                                             Helophorus auricollis
                                                   [Elophorus auricollis]
                                                   [Helophorus angustulus]
                                                   [Helophorus inquinatus]
                                             Helophorus brevipalpis
                                             Helophorus browni
                                             Helophorus californicus
                                             Helophorus chamberlaini
                                             Helophorus columbianus
                                             Helophorus cuspifer
                                             Helophorus eclectus
                                                   [Helophorus carri]
                                             Helophorus fenderi
                                             Helophorus fortis
                                             Helophorus frosti
                                                   [Elophorus frosti]
                                             Helophorus furius
                                                   [Helophorus frater]
                                             Helophorus granularis
                                             Helophorus hatchi
                                             Helophorus inflectus
                                             Helophorus lacustris
                                             Helophorus latipenis
                                             Helophorus lecontei
                                             Helophorus ledatus
                                             Helophorus leechi
                                                   [Elophorus leechi]
                                             Helophorus linearis
                                                   [Elophorus linearis]
                                             Helophorus linearoides
                                             Helophorus lineatus
                                                   [Elophorus lineatus]
                                                   [Helophorus obsoletesulcatus]
                                             Helophorus marginicollis
                                             Helophorus nitiduloides
                                             Helophorus nitidulus
                                                   [Helophorus gregalis]
                                             Helophorus oblongus
                                             Helophorus obscurus
                                             Helophorus orchymonti
                                             Helophorus oregonus
                                             Helophorus orientalis
                                             Helophorus parasplendidus
                                               Helophorus parasplendidus parasplendidus
                                               Helophorus parasplendidus sperryi
                                             Helophorus robertsi
                                             Helophorus schuhi
                                             Helophorus sempervarians
                                             Helophorus smetanai
                                             Helophorus splendidus