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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 101, No. 5, 2006, pp. 573-576
Bioline Code: oc06097
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 101, No. 5, 2006, pp. 573-576

 en Three new species of Isospora Schneider, 1881 (Apicomplexa: Eimeriidae) from the lesser seed-finch, Oryzoborus angolensis check for this species in other resources (Passeriformes: Emberizidae) from Brazil
Evandro Amaral Trachta e Silva; Ivan Literák & Bretislav Koudela

Abstract

Three new coccidian (Apicomplexa: Eimeriidae) species are reported from the lesser seed-finch, Oryzoborus angolensis check for this species in other resources from Brazil. Sporulated oocysts of Isospora curio n. sp. are spherical to subspherical; 24.6 ' 23.6 (22-26 ' 22-25) μm, shape-index (SI, length/width) of 1.04 (1.00-1.15). Oocyst wall is bilayerd, ~ 1.5 μm thick, smooth and colourless. Micropyle and oocyst residuum are absent. The sporocysts are ovoid, 13.2 x 10.9 (15-17 x 10-13) μm, SI = 1.56 (1.42-1.71), with a small Stieda body and residuum composed of numerous granules scattered among the sporozoites. Sporozoites are elongated and posses a smooth surface and two distinct refractile bodies. Oocysts of Isospora braziliensis check for this species in other resources n. sp. are spherical to subspherical, 17.8 x 16.9 (16-19 x 16-18) μm, with a shape-index of 1.06 (1.00-1.12) and a smooth, single-layered wall ~ 1 μm thick. A micropyle, oocyst residuum and polar granules are absent. Sporocysts are ellipsoid and slightly asymmetric, 13.2 x 10.8 (12-14 x 9-12) μm, SI = 1.48 (1.34-1.61). Each sporocyst contains a barely visible Stieda body and a residuum composed numerous of granules. Sporozoites are elongated and each of them contains two distinct refractile bodies. Oocysts of Isospora paranaensis check for this species in other resources n. sp. are subspherical to broadly ellipsoid 24.3 x 19.8 (22-26 x 18-22) μm, SI = 1.22 (1.15-1.38) with smooth single-layered wall ~ 1.5 μm thick. A micropyle and oocyst residuum are absent, but one distinct ellipsoid polar granule (2.5-3.5 x 1.5-2.5 μm) is present. Sporocyst are ovoid, 15.7 x 10.1 (14-18 ' 8-12) μm, SI = 1.46 (1.31-1.72), with distinct Stieda and sub-Stieda bodies. Each sporocyst contains a spherical sporocyst residuum, 4 μm in diameter. All described isosporan species represent a possible cause of acute coccidiosis for O. angolensis in captivity.

Keywords
Isospora - curio - lesser seed-finch - Oryzoborus angolensis - Brazil

 
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