Morphological and Molecular Characterization of a New <i>Isospora</i> (Apicomplexa: Eimeriidae) Species From a Singing Honeyeater (<i>Gavicalis virescens</i> Vieillot, 1817) (Passeriformes: Meliphagidae) in Western Australia.

ABSTRACT: We describe and characterize a new Isospora species from the Singing honeyeater (Gavicalis virescens) in Western Australia, both morphologically and molecularly. Microscopic analysis of a fecal sample identified 25 ellipsoidal oocysts, measuring 21-25 × 18-20 μm (mean 23.4 × 18.7 μm), with a length/width (L/W) ratio of 1.2-1.3 (mean 1.25). The oocyst wall is bilayered and ~1.0 μm thick, with a smooth outer layer making up about two-thirds of the thickness. A micropyle cap, measuring ~2.0 × 4.5 μm, is present as a curved protrusion on the outer layer. The micropyle itself is ~4.5 μm wide. The oocysts lack a residuum but contain 1-2 polar granules. The 25 ellipsoidal sporocysts measured 14-15 × 8-9 μm (mean 14.1 × 8.7 μm) with an L/W ratio of 1.6-1.7 (mean 1.62). The Stieda bod

SUBMITTER: Chen Y 

PROVIDER: S-EPMC11742968 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature