Class Hirudinea Lamarck, 1818 - leeches see Subclass Hirudinida Subclass Euhirudinea Lukin, 1956 - true leeches see Subclass Hirudinida Order Rhynchobdellida Blanchard, 1894 Family Glossiphoniidae Vaillant, 1890 Subfamily Theromizinae see Subfamily Theromyzinae Sawyer, 1986 1 Genus Theromyzon Philippi, 1867