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  Animalia
      Arthropoda
            Arachnida
              Acari
                     [Acarina]
                  Acariformes
                    Trombidiformes
                      Prostigmata
                          Hygrobatoidea
                            Pionidae
                                   [Nautarachnidae]
                                     Forelia
                                             Forelia americana
                                             Forelia borealis
                                             Forelia cayuga
                                             Forelia cooki
                                             Forelia cursor
                                             Forelia floridensis
                                             Forelia liliacea
                                             Forelia onondaga
                                             Forelia ovalis
                                             Forelia pinguipalpis
                                             Forelia siegasiana
                                     Huitfeldtia
                                             Huitfeldtia rectipes
                                     Hydrochoreutes
                                             Hydrochoreutes intermedius
                                             Hydrochoreutes michiganensis
                                             Hydrochoreutes microporus
                                             Hydrochoreutes schizopetiolatus
                                             Hydrochoreutes ungulatus
                                     Najadicola
                                             Najadicola ingens
                                     Nautarachna
                                             Nautarachna karl-vietsi
                                             Nautarachna muskoka
                                             Nautarachna queticoensis
                                     Neotiphys
                                             Neotiphys pionoidellus
                                     Piona
                                             Piona alzatei
                                             Piona americana
                                             Piona baffinensis
                                             Piona brunsoni
                                             Piona carnea
                                             Piona clavicornis
                                             Piona coccinoides
                                               Piona coccinoides baffinensis
                                               Piona coccinoides coccinoides
                                             Piona conglobata
                                               Piona conglobata comglobata
                                               Piona conglobata wisconsinensis
                                             Piona conglobatella
                                             Piona constricta
                                             Piona coronis
                                             Piona crassa
                                             Piona debilis
                                             Piona exilis
                                             Piona flatheadensis
                                             Piona floridana
                                             Piona guatemalensis
                                             Piona haberba
                                             Piona inconstans
                                             Piona insularis
                                             Piona interrupta
                                             Piona linguaplax
                                             Piona loda
                                             Piona media
                                             Piona michiganensis
                                             Piona mitchelli
                                             Piona napio
                                             Piona neumani
                                             Piona nodata
                                             Piona pearsei
                                             Piona pinguipalpis
                                             Piona pugilis
                                             Piona reighardi
                                             Piona rotunda
                                             Piona rubrapes
                                             Piona setiger
                                             Piona socialis
                                             Piona spangleri
                                             Piona spinulosa
                                             Piona triangularis
                                             Piona turgida
                                             Piona uncata
                                             Piona variabilis
                                             Piona washingtonensis
                                             Piona wolcotti
                                     Pionacercus
                                             Pionacercus novus
                                     Pionella
                                             Pionella neogaea
                                     Pionopsis
                                             Pionopsis fragilis
                                             Pionopsis latilamellis
                                             Pionopsis lutescens
                                               Pionopsis lutescens lutescens
                                               Pionopsis lutescens paludis
                                     Pseudofeltria
                                             Pseudofeltria multipora
                                     Tiphys
                                             Tiphys americanus
                                                   [Tiphys torris americanus]
                                             Tiphys brevipes
                                             Tiphys cooki
                                             Tiphys curvipes
                                             Tiphys diversus
                                             Tiphys marshallae
                                             Tiphys mitchelli
                                             Tiphys oliveri
                                             Tiphys ornatus
                                             Tiphys pionoidellus
                                             Tiphys scaurus
                                             Tiphys simulans
                                             Tiphys torris
                                               Tiphys torris torris
                                             Tiphys vernalis
                                             Tiphys vietsi