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  Animalia
      Annelida
            Clitellata
              Oligochaeta
                    Branchiobdellida
                            Branchiobdellidae
                                     Ankyrodilus
                                             Ankyrodilus koronaeus
                                             Ankyrodilus legaeus
                                     Branchiobdella
                                             Branchiobdella astaci
                                             Branchiobdella hexadonta
                                             Branchiobdella parasitica
                                             Branchiobdella pentadonta
                                     Cirrodrilus
                                             Cirrodrilus cirratus
                                     Xironogiton
                                             Xironogiton cassiensis
                                             Xironogiton fordi
                                             Xironogiton instabilis
                                                   [Xironogiton oregonensis oregonensis]
                                                   [Xironogiton oregonensis pectinatus]
                                                   [Xironogiton oregonensis]
                                             Xironogiton kittitasi
                                             Xironogiton occidentalis
                                             Xironogiton victoriensis