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  Animalia
    Bilateria
     Deuterostomia
      Chordata
        Vertebrata
         Agnatha
            Cephalaspidomorphi
                   [Cephalaspidomorpha]
                    Petromyzontiformes
                            Mordaciidae
                                   [Mordaciinae]
                                     Mordacia
                                             Mordacia lapicida
                                             Mordacia mordax
                                             Mordacia praecox