In this study, we describe 2 new species of Eimeria associated with the yellow-crowned Amazon Amazona ochrocephala. Eimeria amazonae n. sp. has bilayered, ellipsoidal, and smooth oocysts that measure 48.9 × 36.2 μm; the length/width ratio is 1.35. The micropyle and oocyst residuum are both absent, but the polar granule is present. Ovoidal sporocysts are 22.2 × 11.9 μm. Stieda and sub-Stieda bodies and sporocyst residuum are present. The 2 elongate sporozoites are curved and measure 18.1 × 3.4 μm; both have 2 refractile bodies. Eimeria ochrocephalae n. sp. has bilayered, ellipsoidal, and smooth oocysts that measure 43.8 × 27.7 μm; the length/width ratio is 1.58. The micropyle and oocyst residuum are absent, but the polar granule is present; ovoidal sporocysts are 20.6 × 10.1 μm. Stieda and sub-Stieda bodies and sporocyst residuum are present; 2 elongate and curved sporozoites are 15.8 × 3.4 μm, each of which has 2 refractile bodies. © American Society of Parasitologists 2011.973503505Balicka-Ramisz, A., Tomza-Marciniak, A., Pilarczyk, B., Wieczorek- Da̧browska, M., Ba̧kowska, M., Pasożyty jelitowe papug (Intestinal parasites of parrots) (2007) Wiadomości Parazytologiczne, 53, pp. 129-132Duszynski, D.W., Revisiting the code: Clarifying name-bearing types for photomicrographs of protozoa (1999) Journal of Parasitology, 85 (4), pp. 769-770. , DOI 10.2307/3285763Gardner, S.L., Fixing coccidian oocysts is not an adequate solution to the problem of preserving protozoan type material (1991) Journal of Parasitology, 77, pp. 52-57Farr, M.M., Eimeria dunsingi n. sp. (Protozoa: Eimeriidae) from the intestine of a parakeet, Melopsittacus undulatus (Shaw) (1960) Libro Homenaje Al Dr. Eduardo Caballero y Caballero, Jubileo 1930-1960, pp. 31-35. , Escuela Nacional de Ciencias Bioló gicas, México City, D.FGottschalk, C., Beitrag zur Faunistik der Vogelkokzidien Thü ringens und Sachsens (1972) Beiträge Zur Vogelkunde, Leipzig, 18, pp. 61-69Juniper, T., Parr, M., (1998) Parrots: A Guide to Parrots of the World, p. 584. , Yale University Press, New Haven, ConnecticutTodd, K.S., Gallina, A.M., Schmidt, J.M., Eimeria dunsingi Farr, 1960: A coccidium of the parakeet Melopsittacus undulates (1977) Proceedings of the Helminthological Society of Washington, 44, pp. 188-190Tsai, S.S., Hirai, K., Itakura, C., Histopathological survey of protozoa, helminths and acarids of imported and local psittacine and passerine birds in Japan (1992) Japanese Journal of Veterinary Research, 40, pp. 161-174Upton, S.J., Wright, T.F., A new species of Eimeria (Apicomplexa) from the orange-fronted conure, Aratinga canicularis (Psittaciformes), in Costa Rica (1994) Acta Protozoologica, 33, pp. 117-119Varghese, T., Eimeria haematodi sp. n. (Protozoa: Eimeriidae) from the rainbow lorikeet, Trichoglossus haematodus, in Papua New Guinea (1977) Journal of Parasitology, 63 (2), pp. 210-211Wilber, P.G., Duszynski, D.W., Upton, S.J., Seville, R.S., Corliss, J.O., A revision of the taxonomy and nomenclature of the Eimeria spp. (Apicomplexa: Eimeriidae) from rodents in the Tribe Marmotini (Sciuridae) (1998) Systematic Parasitology, 39 (2), pp. 113-135. , DOI 10.1023/A:1005914010087Wright, T.F., Schirtzinger, E.E., Matsumoto, T., Eberhard, J.R., Graves, G.R., Sanchez, J.J., Capelli, S., Fleischer, R.C., A multilocus molecular phylogeny of the parrots (Psittaciformes): Support for a Gondwanan origin during the Cretaceous (2008) Molecular Biology and Evolution, 25, pp. 2141-2156