Three new coccidian (Apicomplexa: Eimeriidae) species are reported from the lesser seed-finch, Oryzoborus angolensis from Brazil. Sporulated oocysts of Isospora curio n. sp. are spherical to subspherical; subspherical, 17.8 × 16.9 (16-19 × 16-18) The lesser seed-finch Oryzoborus angolensis (Linnaeus, 1766) (Passeriformes: Emberizidae) is a bird distributed in open woodland, savanna, bushes, and shrubs in forest edge of Latin America. They are found from North of the Lesser Antilles through Venezuela, Brazil, and Bolivia to South Argentina (Sick 1993). The lesser seedfinches are highly coveted as pet birds and are considered to be among the noblest singing birds. This feature has made this species one of the most highly prized songbirds in Brazil and many birds are bred in captivity. These finches are also frequently trapped from the wild and, consequently, wild lesser seed-finch populations have declined.No species of Isospora have previously been described in emberizid birds of the genus Oryzoborus. The present study provides descriptions of three new species of Isospora from O. angolensis. MATERIALS AND METHODSA total of 675 O. angolensis were examined in this study. The birds originated from 48 private aviaries localized in the state of Mato Grosso do Sul, Brazil. They were reared in suspended cages and individual faecal samples were collected immediately upon defecation on tinfoil on the bottom of the cages at the different day-time. Faecal material was placed in vials containing 2.5% (w/v) potassium dichromate solution and shipped to the University of Veterinary and Pharmaceutical Sciences in Brno for follow-up examination. Faecal samples were 3-8 weeks old when screened for coccidia using flotation in Sheather's sugar solution (specific gravity 1.30). The sporulated oocysts were examined and photographed with an Olympus AX 70 microscope using Nomarski interference contrast optics (DIC). All measurements were made using a calibrated ocular micrometer and reported as means in micrometers (µm), followed by the range in parentheses. RESULTSDuring the coprological examination of the 675 O. angolensis, we detected the presence of oocysts of genus Isospora in 178 birds. The morphological evaluation of sporulated oocysts revealed three different species of Isospora that are described and discussed bellow.
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