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  Animalia
      Arthropoda
            Diplopoda
                   [Chilognatha]
              Helminthomorpha
                    Spirobolida
                            Atopetholidae
                              Arinolinae
                                     Arinolus
                                             Arinolus apachellus
                                             Arinolus chiricahuanus
                                             Arinolus citrinus
                                             Arinolus dentatus
                                             Arinolus hopinus
                                             Arinolus hospes
                                             Arinolus latus
                                             Arinolus nevadae
                                             Arinolus nogalanus
                                             Arinolus pimus
                                             Arinolus sequens
                                             Arinolus torynophor
                                     Piedolus
                                             Piedolus utus
                                     Scobinomus
                                             Scobinomus serratus
                                     Tarascolus
                                             Tarascolus bolivari
                                             Tarascolus clarus
                                             Tarascolus reflexus
                              Atopetholinae
                                     Atopetholus
                                             Atopetholus angelus
                                             Atopetholus barbaranus
                                             Atopetholus californicus
                                             Atopetholus carmelitus
                                             Atopetholus fraternus
                                             Atopetholus michelbacheri
                                             Atopetholus pearcei
                                     Tidolus
                                             Tidolus parvus
                                     Watichelus
                                             Watichelus cooki
                                             Watichelus edentatus
                                             Watichelus emarginatus
                                             Watichelus parallelus
                                             Watichelus robustus
                                             Watichelus smithi
                                     Cyclothyrophorus
                                             Cyclothyrophorus salvini
                              Eurelinae
                                     Centrelus
                                             Centrelus boreus
                                             Centrelus falcatus
                                             Centrelus heteropygus
                                             Centrelus neglectus
                                             Centrelus nietanus
                                             Centrelus nigrescens
                                             Centrelus spinosus
                                             Centrelus vulvanus
                                             Centrelus zacatecus
                                     Comanchelus
                                             Comanchelus camporum
                                             Comanchelus chihuanus
                                             Comanchelus hubrichti
                                             Comanchelus lobatus
                                     Eurelus
                                             Eurelus soleatus
                                     Mannobolus
                                             Mannobolus peninsularis
                                     Toltecolus
                                             Toltecolus fluvialis
                                             Toltecolus kerrensis
                                     Uvaldia
                                             Uvaldia intersecta
                              Onychelinae
                                     Onychelus
                                             Onychelus nigrescens
                                             Onychelus obustus