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  Animalia
      Arthropoda
        Chelicerata
            Arachnida
              Acari
                     [Acarina]
                  Acariformes
                    Trombidiformes
                      Prostigmata
                            Hydrachnidae
                                     Hydrachna
                                             Hydrachna baculoscutata
                                             Hydrachna canadensis
                                             Hydrachna conjecta
                                             Hydrachna crenulata
                                             Hydrachna cruenta
                                               Hydrachna cruenta cruenta
                                               Hydrachna cruenta diminuata
                                             Hydrachna geographica
                                               Hydrachna geographica americana
                                               Hydrachna geographica geographica
                                             Hydrachna hesperia
                                             Hydrachna hungerfordi
                                             Hydrachna hutchinsoni
                                             Hydrachna leegei
                                             Hydrachna magniscutata
                                             Hydrachna marshallae
                                             Hydrachna microscutata
                                             Hydrachna miliaria
                                             Hydrachna mystomirabilis
                                             Hydrachna rotunda
                                             Hydrachna stipata