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  Animalia
      Arthropoda
            Diplopoda
                   [Chilognatha]
              Helminthomorpha
                    Polydesmida
                      Polydesmidea
                            Polydesmidae
                                     Bidentogon
                                             Bidentogon californicus
                                             Bidentogon helferorum
                                     Calianotus
                                             Calianotus bituberculatus
                                             Calianotus sastianus
                                             Calianotus yosemitensis
                                     Polydesmus
                                             Polydesmus angustus
                                             Polydesmus complanatus
                                               Polydesmus complanatus complanatus
                                             Polydesmus denticulatus
                                             Polydesmus inconstans
                                             Polydesmus superus
                                     Pseudopolydesmus
                                             Pseudopolydesmus caddo
                                             Pseudopolydesmus canadensis
                                             Pseudopolydesmus collinus
                                             Pseudopolydesmus erasus
                                             Pseudopolydesmus euthetus
                                             Pseudopolydesmus minor
                                             Pseudopolydesmus natchitoches
                                             Pseudopolydesmus neoterus
                                             Pseudopolydesmus paludicolus
                                             Pseudopolydesmus paroicus
                                             Pseudopolydesmus pinetorum
                                             Pseudopolydesmus serratus
                                     Retrorsia
                                             Retrorsia benedictae
                                     Scytonotus
                                             Scytonotus australis
                                             Scytonotus bergrothi
                                             Scytonotus columbianus
                                             Scytonotus granulatus
                                             Scytonotus inornatus
                                             Scytonotus insulanus
                                             Scytonotus piger
                                             Scytonotus simplex
                                             Scytonotus virginicus
                                               Scytonotus virginicus michauxi
                                               Scytonotus virginicus virginicus
                                     Snoqualmia
                                             Snoqualmia idaho
                                             Snoqualmia snoqualmie
                                     Speodesmus
                                             Speodesmus aquiliensis
                                             Speodesmus bicornourus
                                             Speodesmus castellanus
                                             Speodesmus echinourus
                                             Speodesmus falcatus
                                             Speodesmus ivyi
                                             Speodesmus reddelli
                                             Speodesmus tuganbius
                                     Utadesmus
                                             Utadesmus henriensis
                                             Utadesmus hoffi