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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

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.

Author information

Correspondence to Marcos Tobias de Santana Miglionico.

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Conflict of interest

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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Keywords

  • Rodents
  • Coccidia
  • Akodon montensis
  • Atlantic Forest
  • Cricetidae