title: Endogenous Life Cycle of Eimeria melanomytis (Apicomplexa: Eimeriidae) from the Dusky Rice Rat, Melanomys caliginosus (Rodentia: Cricetidae: Sigmodontinae) in Costa Rica.
abstract: Endogenous stages of the life cycle of Eimeria melanomytis, infecting the peripheral epithelial cells of villi of the small intestine of experimentally infected young dusky rice rats, Melanomys caliginosus , were studied. Giemsa-stained mucosal scrapings and histological sections were examined for all the stages. Eimeria melanomytis has 3 generations of meronts (M), different in size, shape, and number of merozoites (m); and in size, shape, and location of the nuclei within the cytoplasm of the meronts. The 3 meront types, M1-M3, respectively, had 11-14 (m1), 7-10 (m2), and 20-30 (m3) merozoites. Macrogametocytes and microgametocytes, as well as macrogametes and microgametes, complete the sexual cycle forming the unsporulated oocysts. This parasite's endogenous development produced severe intestinal lesions in experimentally infected dusky rice rats.
authors: Research Department, Universidad de Ciencias Médicas (UCIMED), San José, Costa Rica, del MAG 400 metros al Oeste carretera a Escazú, Código postal 638-1007 Centro Colón.
authors: Misael
authors: M
authors: Chinchilla
authors: Research Department, Universidad de Ciencias Médicas (UCIMED), San José, Costa Rica, del MAG 400 metros al Oeste carretera a Escazú, Código postal 638-1007 Centro Colón.
authors: Idalia
authors: I
authors: Valerio
authors: Research Department, Universidad de Ciencias Médicas (UCIMED), San José, Costa Rica, del MAG 400 metros al Oeste carretera a Escazú, Código postal 638-1007 Centro Colón.
authors: Ronald
authors: R
authors: Sánchez
authors: Research Department, Universidad de Ciencias Médicas (UCIMED), San José, Costa Rica, del MAG 400 metros al Oeste carretera a Escazú, Código postal 638-1007 Centro Colón.
authors: Donald W
authors: DW
authors: Duszynski
mesh_terms: D000818:Animals; D003048:Coccidiosis / Q000469:parasitology / Q000662:veterinary*; D003364:Costa Rica; D004539:Eimeria / Q000254:growth & development* / Q000302:isolation & purification / Q000502:physiology; D005243:Feces / Q000469:parasitology; D007421:Intestine, Small / Q000469:parasitology / Q000648:ultrastructure; D008018:Life Cycle Stages; D052940:Merozoites; D008871:Microvilli / Q000469:parasitology; D033661:Oocysts; D012376:Rodent Diseases / Q000469:parasitology*; D016205:Sigmodontinae / Q000469:parasitology*; D033761:Spores, Protozoan; D053058:Trophozoites