Annelida Lamarck, 1809 - segmented worms
   Class Hirudinea Lamarck, 1818 - leeches see Subclass Hirudinida
     Order Arhynchobdellida Blanchard, 1894
       1 Family Erpobdellidae Blanchard, 1894
       2 Family Haemopidae Sawyer, 1986
       3 Family Hirudinidae Whitman, 1886
       4 Family Glossiphoniidae Vaillant, 1890