Endogenous Life Cycle of Eimeria melanomytis (Apicomplexa: Eimeriidae) from the Dusky Rice Rat, Melanomys caliginosus (Rodentia: Cricetidae: Sigmodontinae) in Costa Rica

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 al...

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Bibliographic Details
Published in:The Journal of parasitology 2017-02, Vol.103 (1), p.56-62
Main Authors: Chinchilla, Misael, Valerio, Idalia, Sánchez, Ronald, Duszynski, Donald W
Format: Article
Language:English
Subjects:
Animals
Coccidiosis - parasitology
Coccidiosis - veterinary
Costa Rica
Eimeria - growth & development
Eimeria - isolation & purification
Eimeria - physiology
Feces - parasitology
Intestine, Small - parasitology
Intestine, Small - ultrastructure
Life Cycle Stages
LIFE CYCLES-SURVEY
Merozoites
Microvilli - parasitology
Oocysts
Rodent Diseases - parasitology
Sigmodontinae - parasitology
Spores, Protozoan
Trophozoites
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Summary: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.
ISSN:0022-3395
1937-2345
DOI:10.1645/16-98