A new species of Eimeria Schneider, 1875 (Apicomplexa: Eimeriidae) from the dusky rice rat Melanomys caliginosus (Tomes) (Mammalia: Rodentia) in Costa Rica |
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Authors: | Misael Chinchilla Idalia Valerio Ronald Sánchez Antonieta González Donald W Duszynski |
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Institution: | 1. Research Department, Universidad de Ciencias Médicas (UCIMED), San José, Costa Rica 2. Department of Biology, University of New Mexico, Albuquerque, NM, 87131, USA
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Abstract: | We collected faecal samples from 24 dusky rice rats, Melanomys caliginosus (Tomes) (Rodentia: Cricetidae: Sigmodontinae), in a Biological Reserve in Costa Rica, and found three (12.5%) to be infected with a species of Eimeria Schneider, 1875, which we describe here as new. Sporulated oöcysts of Eimeria caliginosa n. sp. are almost spheroidal and measure 16–21 × 17–20 (mean 19.6 × 18.2) μm; micropyle, oöcyst residuum and polar granule are absent. Sporocysts are ovoidal, 9–13 × 6–8 (mean 11.2 × 6.7) μm, with small Stieda and sub-Stieda bodies present, but a para-Stieda body is absent; the sporocyst residuum is a compact mass of c.11–15 granules, c.5 μm wide. Sporozoites are crescent-shaped, 5–8 × 2–3 (mean 6.8 × 2.4) μm. This is the third species of Eimeria described from the genus Melanomys Thomas. |
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