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. 2022 Jan 7:2:100075.
doi: 10.1016/j.crpvbd.2022.100075. eCollection 2022.

Eimeria spp. and Tyzzeria perniciosa Allen, 1936 (Apicomplexa: Eimeriidae) from a Pacific black duck, Anas superciliosa Gmelin (Aves: Anseriformes), in western Australia

Bruno P Berto  1 , Belinda Brice  2 , Gwyneth Thomas  2 , Aileen Elloit  3 , Alireza Zahedi  4 , Rongchang Yang  3   5
Affiliations

Eimeria spp. and Tyzzeria perniciosa Allen, 1936 (Apicomplexa: Eimeriidae) from a Pacific black duck, Anas superciliosa Gmelin (Aves: Anseriformes), in western Australia

Bruno P Berto et al. Curr Res Parasitol Vector Borne Dis. .

Abstract

Four species of the Eimeriidae, Eimeria anatis Scholtyseck, 1955, Eimeria aythyae Farr, 1965, Eimeria krylovi Svanbaev & Rakhmatullina, 1967 and Tyzzeria perniciosa Allen, 1936, were morphologically identified from oöcysts recovered from a Pacific black duck, Anas superciliosa Gmelin. Additionally, genotypic characterization of E. anatis is provided via sequencing of the mitochondrial cytochrome c oxidase subunit 1 (cox1) and the small subunit ribosomal RNA (18S) genes. The four species are redescribed, providing additional morphological details. The validity of genera and coccidian species parasitizing birds of the order Anseriformes such as Wenyonella Hoare, 1933 and some Tyzzeria spp. are discussed. Molecular phylogenetic analyses for the cox1 and 18S rRNA genes resulted in monophylies of Eimeria spp. from Anseriformes which included the sequences obtained from E. anatis oöcysts.

Keywords: 18S rRNA gene; Anas superciliosa; Coccidia; Eimeria; Pacific black duck; Tyzzeria; cox1 gene.

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Conflict of interest statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Figures

Image 1
Graphical abstract
Fig. 1
Fig. 1
Composite line drawing (A) and photomicrographs (B, C) of sporulated oöcysts of Eimeria anatis from the Pacific black duck Anas superciliosa. Note the anterior (arb) and posterior (prb) refractile bodies; micropyle (m); polar granule (pg); rough oöcyst wall (row); Stieda body (sb); and sporocyst residuum (sr). Scale-bars: 10 μm.
Fig. 2
Fig. 2
Composite line drawing (A) and photomicrographs (B, C) of sporulated oöcysts of Eimeria aythyae from the Pacific black duck Anas superciliosa. Note the micropyle (m); micropyle cap (mc); nucleus (n); Stieda body (sb); sporocyst residuum (sr); and refractile body (rb). Scale-bars: 10 μm.
Fig. 3
Fig. 3
Composite line drawing (A) and photomicrographs (B, C) of sporulated oöcysts of Eimeria krylovi from the Pacific black duck Anas superciliosa. Note the micropyle (m); micropyle cap (mc); sporocyst residuum (sr); and refractile body (rb). Scale-bars: 10 μm.
Fig. 4
Fig. 4
Composite line drawing (A) and photomicrographs (B, C) of sporulated oöcysts of Tyzzeria perniciosa from the Pacific black duck Anas superciliosa. Note the inner (il) and outer (ol) layers of the oöcyst wall; oöcyst residuum (or); refractile body (rb); and sporozoite (sz). Scale-bars: 10 μm.
Fig. 5
Fig. 5
Evolutionary relationships of Eimeria anatis inferred by maximum likelihood analysis (ML) of 18S rDNA sequences (A, alignment length 1209 bp; B, alignment length 424 bp). Percentage support (> 70%) from 1000 pseudoreplicates from the ML analysis is indicated at the nodes.
Fig. 6
Fig. 6
Evolutionary relationships of Eimeria anatis inferred by maximum likelihood analysis (ML) of partial cox1 gene sequences (650 bp). Percentage support (> 70%) from 1000 pseudoreplicates from the ML analysis is indicated at the nodes.
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