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  Animalia
    Bilateria
     Deuterostomia
      Chordata
        Vertebrata
         Agnatha
            Cephalaspidomorphi
                   [Cephalaspidomorpha]
                    Petromyzontiformes
                            Petromyzontidae
                                   [Petromyzontinae]
                                   [Petromyzonidae]
                                     Caspiomyzon
                                             Caspiomyzon wagneri
                                     Entosphenus
                                             Entosphenus folletti
                                                   [Lampetra folletti]
                                             Entosphenus lethophagus
                                                   [Lampetra lethophaga]
                                             Entosphenus macrostomus
                                                   [Lampetra macrostoma]
                                             Entosphenus minimus
                                                   [Lampetra minima]
                                             Entosphenus similis
                                                   [Lampetra similis]
                                             Entosphenus tridentatus
                                                   [Lampetra tridentata]
                                     Eudontomyzon
                                             Eudontomyzon danfordi
                                                   [Eudontomyzon gracilis]
                                             Eudontomyzon graecus
                                             Eudontomyzon hellenicus
                                             Eudontomyzon mariae
                                             Eudontomyzon morii
                                             Eudontomyzon stankokaramani
                                             Eudontomyzon vladykovi
                                     Ichthyomyzon
                                             Ichthyomyzon bdellium
                                             Ichthyomyzon castaneus
                                             Ichthyomyzon fossor
                                             Ichthyomyzon gagei
                                             Ichthyomyzon greeleyi
                                                   [Ichthyomyzon hubbsi]
                                             Ichthyomyzon unicuspis
                                     Lampetra
                                             Lampetra aepyptera
                                                   [Lampetra meridionale]
                                             Lampetra alavariensis
                                             Lampetra auremensis
                                             Lampetra ayresii
                                                   [Lampetra ayresi]
                                             Lampetra fluviatilis
                                             Lampetra hubbsi
                                                   [Entosphenus hubbsi]
                                             Lampetra lanceolata
                                                   [Eudontomyzon lanceolata]
                                             Lampetra lusitanica
                                             Lampetra pacifica
                                             Lampetra planeri
                                             Lampetra richardsoni
                                     Lethenteron
                                             Lethenteron alaskense
                                                   [Lampetra alaskense]
                                                   [Lampetra alaskensis]
                                             Lethenteron appendix
                                                   [Lampetra appendix]
                                                   [Lampetra lamottei]
                                                   [Lampetra lamottenii]
                                             Lethenteron camtschaticum
                                                   [Entosphenus japonicus]
                                                   [Lampetra camtschatica]
                                                   [Lampetra japonica]
                                                   [Lethenteron japonicum]
                                             Lethenteron kessleri
                                                   [Lampetra kessleri]
                                             Lethenteron matsubarai
                                             Lethenteron ninae
                                             Lethenteron reissneri
                                                   [Lampetra mitsukurii]
                                                   [Lampetra reissneri]
                                             Lethenteron zanandreai
                                                   [Lampetra zanandreai]
                                     Petromyzon
                                             Petromyzon marinus
                                     Tetrapleurodon
                                             Tetrapleurodon geminis
                                                   [Lampetra geminis]
                                             Tetrapleurodon spadiceus
                                                   [Lampetra spadicea]