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  Animalia
      Annelida
            Clitellata
              Hirudinea
                Euhirudinea
                    Rhynchobdellida
                            Piscicolidae
                              Piscicolinae
                                     Baicalobdella
                                             Baicalobdella torquata
                                     Branchellion
                                             Branchellion borealis
                                             Branchellion lobata
                                             Branchellion ravenelii
                                             Branchellion torpedinis
                                     Calliobdella
                                             Calliobdella knightjonesi
                                             Calliobdella lophii
                                                   [Calliobdella punctata]
                                             Calliobdella nodulifera
                                                   [Calliobdella modulifer]
                                             Calliobdella vivida
                                                   [Calliobdella carolinensis]
                                                   [Trachelobdella vividus]
                                     Caspiobdella
                                             Caspiobdella caspica
                                             Caspiobdella fadejewi
                                             Caspiobdella tuberculata
                                     Cystobranchus
                                             Cystobranchus mammillatus
                                             Cystobranchus meyeri
                                             Cystobranchus moorei
                                             Cystobranchus verrilli
                                             Cystobranchus virginicus
                                     Johanssonia
                                             Johanssonia arctica
                                                   [Oxytonostoma artica]
                                     Orientobdella
                                             Orientobdella confluens
                                     Piscicola
                                             Piscicola geometra
                                             Piscicola milneri
                                             Piscicola punctata
                                             Piscicola salmositica
                                             Piscicola zebra
                                     Trachelobdella
                                             Trachelobdella lubrica
                                             Trachelobdella oregonensis
                              Platybdellinae
                                     Aestabdella
                                             Aestabdella abditovesiculata
                                             Aestabdella leiostomi
                                     Austrobdella
                                           [Australobdella]
                                             Austrobdella californica
                                                   [Australobdella californica]
                                     Beringobdella
                                             Beringobdella rectangulata
                                                   [Piscicola rectangulata]
                                     Hemibdella
                                           [Arctobdella]
                                             Hemibdella branchiarum
                                                   [Arctobdella branchiarum]
                                             Hemibdella rapax
                                                   [Ichthyobdella rapax]
                                     Malmiana
                                           [Ottoniobdella]
                                             Malmiana brunnea
                                             Malmiana bubali
                                             Malmiana diminuta
                                             Malmiana philotherma
                                             Malmiana scorpii
                                                   [Ottoniobdella scorpii]
                                             Malmiana virida
                                             Malmiana yorki
                                     Mysidobdella
                                             Mysidobdella borealis
                                     Myzobdella
                                           [Ichthyobdella]
                                           [Illinobdella]
                                             Myzobdella lugubris
                                                   [Ichthyobdella funduli]
                                                   [Illinobdella alba]
                                                   [Illinobdella elongata]
                                                   [Illinobdella moorei]
                                                   [Illinobdella richardsoni]
                                                   [Myzobdella funduli]
                                             Myzobdella patzcuarensis
                                     Notostomum
                                           [Carcinobdella]
                                           [Notostomobdella]
                                             Notostomum cyclostomum
                                                   [Carcinobdella cyclostoma]
                                                   [Notostomobdella cyclostoma]
                                             Notostomum laeve
                                     Oceanobdella
                                             Oceanobdella microstoma
                                             Oceanobdella pallida
                                             Oceanobdella sexoculata
                                                   [Platybdella buccalis]
                                     Ostreobdella
                                           [Ostreodbella]
                                             Ostreobdella papillata
                                                   [Ostreodbella papillata]
                                     Piscicolaria
                                             Piscicolaria reducta
                                     Platybdella
                                             Platybdella anarrhichae
                                             Platybdella fabricii
                                                   [Crangonobdella murmanica]
                                             Platybdella olriki
                                             Platybdella quadrioculata
                              Pontobdellinae
                                     Oxytonostoma
                                             Oxytonostoma typica
                                     Pontobdella
                                             Pontobdella muricata
                                             Pontobdella vosmaeri
                                     Stibarobdella
                                             Stibarobdella macrothela