Subclass Euhirudinea Lukin, 1956 - true leeches see Subclass Hirudinida
   Order Arhynchobdellida Blanchard, 1894
     Suborder Hirudiniformes Caballero, 1952
       Family Hirudinidae Whitman, 1886
         1 Subfamily Hirudininae (Richardson, 1969)
         2 Subfamily Haemopinae (Richardson, 1969)
         3 Subfamily Semiscolecinae (Scriban & Autrum, 1934)
         4 Subfamily Hirudinarinae Sawyer, 1986
         5 Subfamily Macrobdellinae (Richardson, 1969) see Family Macrobdellidae Richardson, 1969
         6 Subfamily Richardsonianinae (Richardson, 1969)
         7 Subfamily Ornithobdellinae (Richardson, 1969)