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  Animalia
      Arthropoda
        Chelicerata
            Arachnida
              Acari
                     [Acarina]
                  Acariformes
                    Sarcoptiformes
                      Oribatida
                             [Oribatei]
                        Brachypylina
                          Oppioidea
                            Quadroppiidae
                                     Borhidia
                                             Borhidia andina
                                             Borhidia cubana
                                     Hexoppia
                                             Hexoppia heterotricha
                                     Quadroppia
                                       Quadroppia (Coronoquadroppia)
                                             Quadroppia abchasica
                                             Quadroppia circumita
                                             Quadroppia crenata
                                             Quadroppia expansa
                                             Quadroppia galaica
                                             Quadroppia media
                                             Quadroppia michaeli
                                             Quadroppia monstruosa
                                             Quadroppia nana
                                             Quadroppia nasalis
                                             Quadroppia omodeoi
                                             Quadroppia pseudocircumita
                                             Quadroppia trapezoidea
                                       Quadroppia (Quadroppia)
                                             Quadroppia cristata
                                             Quadroppia hammerae
                                             Quadroppia illinoisensis
                                             Quadroppia longisetosa
                                             Quadroppia maritalis
                                             Quadroppia minima
                                             Quadroppia obsoleta
                                             Quadroppia quadricarinata