A new species of Cystoisospora Frenkel, 1977 (Apicomplexa: Sarcocystidae) from Oecomys mamorae Thomas (Rodentia: Cricetidae) in the Brazilian Pantanal
Última publicação do grupo, resultado do mestrado da Doutoranda Wanessa Teixeira Gomes Barreto e colaboradores. Trabalho realizado no Pantanal em roedores silvestres onde foi proposto uma nova espécie de coccidio.
Abstract Despite the great diversity of coccidians, to our knowledge, no coccidian infections have been described in Oecomys spp. In this context, we examined Oecomys mamorae Thomas (Rodentia: Cricetidae) from the Brazilian Pantanal for infections with enteric coccidia. Nine individuals were sampled, and one was found to be infected. The oo¨cysts were recovered through centrifugal flotation in sugar solution. Using morphological and morphometric features, we described a new species of Cystoisospora Frenkel, 1977. Sporulated oo¨cysts were ovoidal 20.0–29.1 9 16.4–23.2 (26.7 9 21.2) lm and contained two sporocysts, 12.9–19.1 9 9.4–13.9 (16.4 9 12.4) lm, each with four banana-shaped sporozoites. Polar granule and oocyst residuum were both absent. We documented the developmental forms in the small intestine and described the histopathological lesions inthe enteric tract. Our results indicate that the prevalence of Cystoisospora mamorae n. sp. in O. mamorae is low, and tissue damage in the enteric tract is mild, even in the presence of coccidian developmental stages.
