Odontoterakis Skrjabin & Schikhobalova, 1947 contains five species from South American and Australian birds: O. crypturi (Baylis, 1944), type-species; O. alata (Schneider, 1866) n. comb.; O. fariai (Travassos, 1913); O. valvata (Schneider, 1866); O. bancrofti (Johnston, 1912); all with slightly curved cordons, cheilorhabdions within mass of lips, and in most species a pair of elongate papillae between para-suctorials and peri-cloacals. Haroldak& n. g. from South American birds, contains Heterakis multidentata Baylis, 1944 as type-and sole species, with non-curved cordons, cheilorhabdions projecting beyond mass of lips, a pair of sessile papillae on raised area between para-suctorials and peri-cloacals, and a median doubled structure on a raised posterior cloacal lip. Synonyms recognised are: Heterakis arquata Schneider, 1866 = O. alata; H. arquata of Travassos (1913) nec Schneider, 1866 = (?) O. crypturi; H. brasiliana yon Linstow, 1899 = species dubia; H. brasiliana of Travassos (1918) nec yon Linstow = (?) O.