Isospora machadoae sp. nov. (Protozoa: Apicomplexa: Eimeriidae), a new coccidian species from white-necked thrushes Turdus albicolis (Passeriformes: Turdidae) of South America

• Autor(a) principal: Pinho,Irlane F. de
• Data de Publicação: 2018
• Outros Autores: Silva,Lidiane M. da, Rodrigues,Mariana B., Lopes,Bruno do B., Oliveira,Mariana S., Luz,Hermes R., Ferreira,Ildemar, Lopes,Carlos Wilson G., Berto,Bruno P.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Zoologia (Curitiba. Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702018000100309
• topic: Taxonomy; coccidia; oocysts; wild birds; Parque Nacional do Itatiaia

ABSTRACT A new coccidian species parasitizing white-necked thrushes Turdus albicollis Vieillot, 1818 is described from the Parque Nacional do Itatiaia, in Southeastern Brazil. Isospora machadoae sp. nov. has oocysts that are sub-spherical, 22.2 × 21.2 µm, with bilayered wall, ~1.3 μm thick. Outer layer is rough with micropyle and micropyle cap. Oocyst residuum is absent, but one or two polar granules are present. Sporocysts are ellipsoidal, 13.3 × 9.7 µm. The Stieda body is flattened to half-moon-shaped and substieda body rounded. Sporocyst residuum is present, composed of scattered spherules of different sizes. Sporozoites are vermiform with a refractile body and a nucleus. These parasitized thrushes had no apparent clinical signs of coccidiosis or high densities of oocysts in feces. This condition may be associated with a specific low pathogenicity of I. machadoae sp. nov. and/or with the conserved habitat of these birds, which ensures the ecological niches and thus the immunocompetence to wildlife.