The avian order Strigiformes consists of two families, the Strigidae (136 species) and the Tytonidae (12 species). Thirteen species of haemoproteids (Haemosporina: Haemoproteidae) have previously been described from the Strigidae while none have been described from the Tytonidae. A review of these species based on the morphometric parameters of the gametocyte indicates that Haemoproteus asio and H. otus are nomina nuda; H.bubonis, H. aluci and H. glaucidiumi are nomina dubia; H. glaucidii, in partim, H. bramae, H. cellii, in partim and H. nebraskensis are synonyms of H. noctuae and H. glaucidii, in partim., H. cellii, in partim., H. multiparasitans and H. aegyptius are synonyms of H. syrnii. Haemoproteus noctuae and H. syrnii are herein redescribed and neohapantotypes and paraneohapantotypes are designated. Haemoproteus phodili n. sp. is described from the Tytonidae. -- Other blood parasites which were recorded from the Strigiformes included: Leucocytozoon ziemanni, Plasmodium relictum, P. vaughani, P. polare, P. fallax, P. circumflexum, P. elongatum, Trypanosoma avium, T. calmettei, T. everetti, Atoxoplasma sp., Babesia sp., microfilaria and unidentified parasites
