1 Subclass Branchiobdellidea Count: 1o1f1g 2 Subclass Acanthobdellidea Livanow, 1905 see Subclass Hirudinida Count: 1o1f1g 3 Subclass Euhirudinea Lukin, 1956 - true leeches see Subclass Hirudinida Count: 2o;9f;16g