Class Hirudinea Lamarck, 1818 - leeches see Subclass Hirudinida
   Subclass Euhirudinea Lukin, 1956 - true leeches see Subclass Hirudinida
     Order Arhynchobdellida Blanchard, 1894
       Suborder Hirudiniformes Caballero, 1952
         Family Hirudinidae Whitman, 1886
           Subfamily Hirudininae (Richardson, 1969)
             Genus Hirudo Linnaeus, 1758
               1 Hirudo medicinalis Linnaeus, 1758