Abstract
The present research aims to identify polysporocystic oocysts in Isabelline wheatear (Oenanthe isabellina, Passeriformes, Aves). The fecal samples were collected from 84 birds caught in the semi-desert territories of Gobustan and Shirvan (eastern Azerbaijan) in spring and autumn over a 4-year period. Oocysts with 8 sporocysts were found in 2 of all the studied samples. Oocysts were oval; the oocyst wall smooth and single-layered, with no micropyle. The sizes of oocysts were 39.26 ± 0.63 x 34.9 ± 0.74 (μm), FI = 1.21 ± 0.04. The sporocysts were spherical, measuring 11.4 to 13.1 μm in diameter. FI = 1. The invasion rate was not high, from 5 to 17 oocysts in the preparation, i.e. in a drop of fluid. We suppose that the polysporocystic oocysts found in the Isabelline wheatear are pseudoparasites (Adeleina, Coccidia). The birds may have infected by the pseudoparasite after feeding on an infected insect.
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