Family Bdellidae Dugès, 1834 1 Subfamily Bdellinae Dugès, 1834 2 Subfamily Cytinae Grandjean, 1938 3 Subfamily Polytrichinae van der Schyff, Theron & Ueckermann, 2003 [monotypic] 4 Subfamily Spinibdellinae Grandjean, 1938 5 Subfamily Odontoscirinae Grandjean, 1938