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Orientatractis bowseri n. sp. (Nematoda: Cosmocercoidea: Atractidae) parasite of Peltocephalus dumerilianus (Schweigger) (Testudines: Podocnemididae) from the Brazilian Amazon

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Abstract

Peltocephalus dumerilianus (Schweigger) is a diurnal freshwater turtle widely distributed in the Orinoco and Amazon River basins in Brazil, Colombia, Peru, Ecuador, Venezuela, and French Guiana. During a helminthological survey of freshwater turtles from the Brazilian Amazon, numerous nematodes with characteristics of the genus Orientatractis Petter, 1966 were recovered from the stomach of Peltocephalus dumerilianus. These nematodes were different from all congeneric species, and we describe herein. Orientatractis bowseri n. sp. differs from all known species of the genus by having dorsal cuticular projections on the posterior region of the females, distribution of caudal papillae and by having papilla-like ornamentations on the cuticle distributed from the mid-esophagus to the mid portion of the body. This study represents the fourth specie of the genus Orientatractis reported in Brazil, the seventh species of Orientatractis in the Neotropical region, and the third found infecting freshwater turtles in Brazil.

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Acknowledgements

We are grateful to Felipe Salgado Cordeiro for her support in host necropsies and collection nematodes; to Yuri Willkens for his technical support with SEM analyzes and Dra. Edilene Oliveira da Silva, from Laboratory of Cellular Structural Biology at the Federal University of Pará, Belém, for her technical support with the SEM analyses.

Funding

This study was supported by Coordination for the Improvement of High Higher Education Personnel (CAPES)/ Postgraduate Program in the Biology of Infectious and Parasitic Agents (PPGBAIP)/ UFPa, Amazon Foundation for Research and Studies Support (FAPESPA), Programa de Apoio a Nucleos Emergentes (FAPESPA/CNPq PRONEM 01/2021, process number 51/2021); Research productivity scholarship of CNPq to F.T.V. Melo (Process number 314116/2021-4). All procedures contributing to this work comply with all applicable institutional, national, and international guidelines for animal care and use Animal Research Ethics Committee, UFPa, under license N8341260821CEUA/UFPa. The present study was approved by Chico Mendes Institute for Biodiversity Conservation (ICMBio), Brazil, and host specimens were collected under license number SISBIO: 53527-4. This study is part of the Ph.D. thesis of Ronald Ferreira de Jesus in PPGBAIP (Institute of Biological Sciences-UFPa).

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Authors and Affiliations

  1. Laboratory of Cellular Biology and Helminthology “Profa. Dra. Reinalda Marisa Lanfredi”, Institute of Biological Sciences, Federal University of Pará (UFPa), Av. Augusto Correa 01, Guamá, Belém, Pará, 66075-110, Brazil

    Ronald Ferreira Jesus, Ana Nunes Santos & Francisco Tiago Vasconcelos Melo

  2. Núcleo de Altos Estudos Amazônicos (NAEA), Centro de Estudos Avançados da Amazônia, Universidade Federal do Pará, Rua Augusto Correa 01, Belém, Pará, 66075-110, Brazil

    Tamires de Almeida Pereira Oliveira & Daniely Félix-Silva

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  1. Ronald Ferreira Jesus
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  2. Ana Nunes Santos
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  3. Tamires de Almeida Pereira Oliveira
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  4. Daniely Félix-Silva
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  5. Francisco Tiago Vasconcelos Melo
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Contributions

R.F. Jesus wrote the main draft and prepared images. A.N. Santos, T. A. P. Oliveira and D. Félix-Silva helped with specimen observations and SEM analysis, reviewing, and writing the manuscript. F.T.V Melo wrote the manuscript, revised and prepared the line drawings. All authors reviewed the manuscript.

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Correspondence to Ana Nunes Santos.

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Jesus, R.F., Santos, A.N., de Almeida Pereira Oliveira, T. et al. Orientatractis bowseri n. sp. (Nematoda: Cosmocercoidea: Atractidae) parasite of Peltocephalus dumerilianus (Schweigger) (Testudines: Podocnemididae) from the Brazilian Amazon. Syst Parasitol 101, 5 (2024). https://doi.org/10.1007/s11230-023-10135-y

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