Class Hirudinea Lamarck, 1818 - leeches see Subclass Hirudinida
   Subclass Euhirudinea Lukin, 1956 - true leeches see Subclass Hirudinida
     Order Arhynchobdellida Blanchard, 1894
       1 Suborder Erpobdelliformes
       2 Suborder Hirudiniformes Caballero, 1952