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
         1 Family Haemadipsidae Blanchard, 1893
         2 Family Haemopidae Sawyer, 1986
         3 Family Cylicobdellidae Sawyer, 1986
         4 Family Hirudinidae Whitman, 1886