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Three new species of Eimeria Schneider 1875 in the montane grass mouse, Akodon montensis (Rodentia: Cricetidae: Sigmodontinae), and redescription of Eimeria zygodontomyis Lainson and Shaw 1990 from southeastern Brazil

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Abstract

We describe three new coccidian species of the genus Eimeria Schneider 1875 (Apicomplexa: Eimeriidae) and redescribe and report Eimeria zygodontomyis Lainson and Shaw, 1990 in the montane grass mouse, Akodon montensis Thomas, 1913 from the Serra dos Órgãos National Park in southeastern Brazil. Sporulated oocysts of Eimeria zygodontomyis are ellipsoidal to cylindrical with a 0.6 (0.5–0.8) μm thick very delicate bi-layered wall; length × width (n = 49) 18.3 × 12.5 (16–20 × 11–13) μm; length/width ratio of 1.4 (1.2–1.6); 1 polar granule occasionally present; micropyle, residuum both absent. Sporocysts are ellipsoidal; length × width 8.5 × 5.2 (8–11 × 5–6) μm; length/width ratio of 1.5 (1.3–1.7) μm; Stieda body is prominent; sub-Stieda body is absent; sporocyst residuum is compact. Sporulated oocysts of Eimeria montensis n. sp. are spheroidal to subspheroidal with a 1.2 (1.0–1.4) μm thick bi-layered wall; outer layer lightly pitted; length × width (n = 30) 16.3 × 12.5 (15–17 × 13–15) μm; length/width ratio of 1.3 (1.0–1.4); 1 polar granule present; micropyle, residuum both absent. Sporocysts are ellipsoidal; length × width 7.2 × 5.1 (6–8 × 4–6) μm; length/width ratio of 1.4 (1.2–1.6); Stieda body is present, sub-Stieda body is absent; sporocyst residuum consists of small, scattered granules. Sporulated oocysts of Eimeria uricanensis n. sp. are ovoidal to pyriform with a 1.4 ( 1.3–1.6) μm thick bi-layered wall; outer layer lightly pitted; length × width (n = 40) 26.6 × 18.6 (23–30 × 17–20) μm; length/width ratio of 1.4 (1.3–1.6); 1 polar granule present; micropyle, residuum both absent. Sporocysts are ellipsoidal, length × width 13.3 × 8.0 (10–16 × 7–9) μm; length/width ratio of 1.7 (1.5–1.9); Stieda body, sub-Stieda body both absent; sporocyst residuum consists of a cluster of granules, forming a spheroid mass. Sporulated oocysts of Eimeria parnasiensis n. sp. are subspheroidal to ellipsoidal with a 1.8 ( 1.3–2.4) μm thick bi-layered wall; outer layer lightly pitted; length × width (n = 54) 28.2 × 21.9 (26–32 × 19–28) μm; length/width ratio of 1.3 (1.2–1.4); 1 polar granule present; micropyle is absent; oocyst residuum is present and consists of a cluster of granules of varying thickness. Sporocysts are ovoidal, tapering towards the Stieda body; length × width 12.2 × 7.6 (10–13 × 6–9) μm; length/width ratio of 1.6 (1.4–1.9); Stieda body is present; sub-Stieda body is absent; sporocyst residuum is present and consists of an aggregate of thin granules.

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Acknowledgments

We are grateful to the field teams of LABPMSR/IOC-Fundação Oswaldo Cruz and the Vertebrates Laboratory at Universidade Federal do Rio de Janeiro for their help with fieldwork.

Funding

This study was supported by CNPq-PPBio Rede Bioma, CNPq, and FAPERJ.

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Authors and Affiliations

  1. Graduate Program in Biodiversity and Health, Instituto Oswaldo Cruz/Fundação Oswaldo Cruz, Rio de Janeiro, RJ, 21040-360, Brazil

    Marcos Tobias de Santana Miglionico, Sócrates Fraga da Costa Neto, Paulo Sergio D’Andrea & Edwards Frazão-Teixeira

  2. Laboratory of the Biology and Parasitology of Wild Mammal Reservoirs (LABPMR), Instituto Oswaldo Cruz/Fundad Parasitology o, Rio de Janeiro, RJ, 21040-360, Brazil

    Marcos Tobias de Santana Miglionico, Sócrates Fraga da Costa Neto & Paulo Sergio D’Andrea

  3. Department of Biological Sciences and Health, Universidade Federal do Amapá, Macapá, AP, 68903-419, Brazil

    Lúcio André Viana

  4. Laboratory of Structural Biology, Instituto Oswaldo Cruz/Fundação Oswaldo Cruz, Rio de Janeiro, RJ, 21040-360, Brazil

    Helene Santos Barbosa & Edwards Frazão-Teixeira

  5. Laboratory of Pathology, Instituto Oswaldo Cruz/Fundação Oswaldo Cruz, Rio de Janeiro, RJ, 21040-360, Brazil

    Ester Maria Mota

Authors
  1. Marcos Tobias de Santana Miglionico
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  2. Lúcio André Viana
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  3. Helene Santos Barbosa
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  4. Ester Maria Mota
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  5. Sócrates Fraga da Costa Neto
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  6. Paulo Sergio D’Andrea
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  7. Edwards Frazão-Teixeira
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Corresponding author

Correspondence to Marcos Tobias de Santana Miglionico.

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The authors declare that they have no conflict of interest.

Ethical approval

All trapping procedures followed the guidelines for the capture, handling, and care of animals established by the Ethics Committee on the Use of Animals in Research of the Oswaldo Cruz Institute/Fundação Oswaldo Cruz in Rio de Janeiro, and authorized under license numbers L-049/08 and LW81/12. The capture of wild animals was authorized by the Chico Mendes Institute for Biodiversity Conservation (ICMBio), through authorization number 45839-1, in accordance with the pertinent Brazilian legislation.

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de Santana Miglionico, M.T., Viana, L.A., Barbosa, H.S. et al. Three new species of Eimeria Schneider 1875 in the montane grass mouse, Akodon montensis (Rodentia: Cricetidae: Sigmodontinae), and redescription of Eimeria zygodontomyis Lainson and Shaw 1990 from southeastern Brazil. Parasitol Res 119, 291–298 (2020). https://doi.org/10.1007/s00436-019-06531-3

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