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  Animalia
      Arthropoda
            Diplopoda
                   [Chilognatha]
              Helminthomorpha
                    Chordeumatida
                      Chordeumatidea
                          Brannerioidea
                            Caseyidae
                                     Caseya
                                             Caseya benedictae
                                             Caseya borealis
                                             Caseya bryophila
                                             Caseya bucketti
                                             Caseya coxalis
                                             Caseya dendrogona
                                             Caseya dorada
                                             Caseya douglasia
                                             Caseya guttata
                                             Caseya heteropa
                                               Caseya heteropa disjuncta
                                               Caseya heteropa heteropa
                                               Caseya heteropa montana
                                               Caseya heteropa oraria
                                             Caseya longiloba
                                             Caseya megasoma
                                             Caseya occidentalis
                                             Caseya paradoxa
                                             Caseya prionota
                                             Caseya sequoia
                                             Caseya shastensis
                                             Caseya similis
                                             Caseya subtilis
                                             Caseya taliae
                                             Caseya westcotti
                                     Metopiona
                                             Metopiona sheari
                                     Ochrogramma
                                             Ochrogramma bentona
                                             Ochrogramma formosula
                                             Ochrogramma haigi
                                             Ochrogramma heterogona
                                     Opiona
                                             Opiona berryessae
                                             Opiona bifurcata
                                             Opiona casualis
                                             Opiona columbiana
                                             Opiona communis
                                               Opiona communis angusta
                                               Opiona communis communis
                                               Opiona communis prolixa
                                             Opiona confusa
                                             Opiona distincta
                                             Opiona exigua
                                             Opiona facetia
                                             Opiona fisheri
                                             Opiona goedeni
                                             Opiona scytonotoides
                                             Opiona siliquae
                                     Speoseya
                                             Speoseya grahami
                                     Underwoodia
                                             Underwoodia iuloides
                                             Underwoodia tida
                                     Vasingtona
                                             Vasingtona irritans