Abstract
Tyzzeria parvula from the greylag goose (Anser anser) is described in Southeastern Brazil. Oocysts are spherical to subspherical ranging from 12.4-180 to 10.7-15.9 microm (15.4 X 13.4 microm), shape index 1.15, with a double layered wall 0.4 to 0.7 microm thick (n=20), outer smooth and colorless, inner pale greenish. Micropyle is absent, but oocyst residuum is present containing numerous granules and spherules. Surrounded by residuum there are eight sporozoites having one end round and other fine and slightly curved.
Highlights
The greylag goose, Anser anser L., 1758 is a waterfowl very common in Brazil
T. parvula have been considered as the principal causative agent of intestinal coccidiosis in geese, the parasite has not been so far identified in Brazil
The aim of this paper is to present the morphological description of sporulated oocysts of T. parvula from the greylag goose, A. anser, in southeastern Brazil
Summary
The greylag goose, Anser anser L., 1758 is a waterfowl very common in Brazil. This species is worldwide, with an estimated global extend of occurrence of 1,000,00010,000,000 Km2 and population of 920,000-970,000 animals (BIRD LIFE INTERNATIONAL, 2006). In Europe and North America, A. anser and others species from the family Anatidae (A. albifrons, A. caurelensis, A. rossii, Branta canadensis and B. bernicla) are frequently found parasitized by the coccidian protozoan Tyzzeria parvula (Levine 1985; Arslan et al 2002). T. parvula have been considered as the principal causative agent of intestinal coccidiosis in geese, the parasite has not been so far identified in Brazil. The aim of this paper is to present the morphological description of sporulated oocysts of T. parvula from the greylag goose, A. anser, in southeastern Brazil
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