Family Bdellidae Dugès, 1834 Subfamily Spinibdellinae Grandjean, 1938 1 Genus Biscirus Thor, 1913 2 Genus Monotrichobdella Baker & Balock, 1944 3 Genus Spinibdella Thor, 1930 4 Genus Tetrabdella Hernandes & Feres, 2006