New species of Eimeria Schneider, 1875 and Isospora Schneider, 1881 (Apicomplexa: Eimeriidae) from the short-crested flycatcher Myiarchus ferox (Gmelin) (Passeriformes: Tyrannidae) in South America.

In the current study, two new coccidian species (Protozoa: Apicomplexa: Eimeriidae) obtained from short-crested flycatcher Myiarchus ferox (Gmelin) are reported from Brazil. Isospora feroxis n. sp. has oöcysts which are spheroidal to sub-spheroidal, 18.7 x 18.0 microm, with a smooth and bi-layered wall, c. 1.2 microm. The micropyle and oöcyst residuum are absent, but two polar granules are present. Its sporocysts are broadly ellipsoidal and 11.7 x 8.5 microm. Stieda and substieda bodies are present. A sporocyst residuum is present and the sporozoites have a refractile body and nucleus. Oöcysts of Eimeria sicki n. sp. are spheroidal to sub-spheroidal, 30.3 x 28.5 microm, with a smooth and bi-layered wall, c. 1.3 microm. The micropyle, oöcyst residuum and polar granule are absent. Its sporocysts are ellipsoidal, 18.4 x 10.0 microm. Stieda and substieda bodies are present. A sporocyst residuum is present and sporozoites have a refractile body and nucleus.