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A new coccidian (Apicomplexa: Eimeriidae), from midland brown snake, Storeria dekayi wrightorum Trapido (Ophidia: Colubridae) from Arkansas, USA

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Abstract

A new species of coccidian (Protista: Apicomplexa: Eimeriidae) collected from the faeces of a midland brown snake Storeria dekayi wrightorum Trapido (Ophidia: Colubridae) in Arkansas, USA, is described. Oöcysts of Isospora holbrooki n. sp. are subspherical to ovoidal with a smooth, colourless, bi-layered wall, measure on average 27.1 × 24.0 µm, and have a length/width (L/W) ratio of 1.1; both micropyle and oöcyst residuum are absent, but a polar granule is present. Sporocysts are ovoidal, 14.8 × 10.0 µm on average (L/W 1.5); the Stieda body is nipple-like, the sub-Stieda body is ellipsoidal and the sporocyst residuum is composed of coarse granules in a cluster. Sporozoites have a spheroidal anterior refractile body, a subspheroidal posterior refractile body, and one centrally-located nucleus. This is the first description of an isosporan from the snake genus Storeria Baird & Girard as well as the largest oöcysts and sporocysts of any previous snake isosporan to date.

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Acknowledgements

We thank Drs Scott L. Gardner (HWML) and Renn Tumlison (HSU) for expert curatorial assistance.

Funding

This study was supported, in part, by a grant from the National Institute of General Medical Sciences (8P20GM103432-12), National Institutes of Health (NIH) to R.S. Seville. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH.

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Correspondence to Chris T. McAllister.

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The authors declare that they have no conflict of interest.

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All applicable institutional, national and international guidelines for the care and use of animals were followed. Scientific Collecting Permits were provided to CTM and MBC by the Arkansas Game and Fish Commission (permit numbers 031120151 and 090820141) and to CTM by the Oklahoma Department of Wildlife Conservation (permit number 6141).

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McAllister, C.T., Seville, R.S. & Connior, M.B. A new coccidian (Apicomplexa: Eimeriidae), from midland brown snake, Storeria dekayi wrightorum Trapido (Ophidia: Colubridae) from Arkansas, USA. Syst Parasitol 93, 77–82 (2016). https://doi.org/10.1007/s11230-015-9606-8

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  • DOI: https://doi.org/10.1007/s11230-015-9606-8

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