Hepatocystis carpenteri n. sp. parasite of Hypsignathus monstrosus in Gabon is different from Hepatocystis epomophori and Hepatocystis brosseti, parasitic in other African Megachiroptera. H. carpenteri has bigger intrahepatic schizonts and a wall with a spongy appearance which has not been seen in other Hepatocystis.