Morphological and molecular characterization of Eimeria haematodi, coccidian parasite (Apicomplexa: Eimeriidae) in a rainbow lorikeet (Trichoglossus haematodus)
2015
Yang, Rongchang | Brice, Belinda | Ryan, Una
Eimeria haematodi was first described in 1977 from the rainbow lorikeet (Trichoglossus haematodus) in Papua New Guinea. In the present study, we re-describe this coccidian species morphologically and molecularly from a rainbow lorikeet bird in Western Australia (WA). The oocysts were ovoid to slightly piriform and measured 28.5–37.8 by 25.8–33.0 µm (33.3 by 28.1 µm). Oocyst wall was approximately 1.5 µm thick and bilayered. Micropyle (5–7 µm) and oocyst residuum (8.0–10.0 µm) present; polar granule was absent. Sporocysts ellipsoidal, 11.8–13.6 by 8.0–9.6 µm (12.2 by 8.3 µm), with thin convex Stieda body and granular sporocyst residuum (4.0–5.0 µm). Molecular characterization of E. haematodi was conducted at 18S ribosomal RNA and the mitochondrial cytochrome oxidase gene (COI) loci. At the 18S ribosomal RNA locus, E. haematodi shared 98.1% genetic similarity to E. alabamensis from cattle in New South Wales, Australia. At COI locus, E. haematodi was closest (92.3% similarity) to E. praecox from domestic chickens (Gallus gallus domesticus) from Canada and China.
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