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Rhinergasilus unguilongus n. sp. (Copepoda: Ergasilidae): A Gill Parasite of the Freshwater Fish Prochilodus lineatus (Valenciennes, 1837) (Actinopterygii: Prochilodontidae) from the Neotropical Region, Brazil

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Abstract

Purpose

To describe, based on morphological features, a new copepod species of Rhinergasilus, Rhinergasilus unguilongus n. sp., collected from gills of the Streaked prochilod, Prochilodus lineatus (Valenciennes, 1837), sampled in the Veados and Paranapanema Rivers, two tributaries of the Jurumirim Reservoir (Upper Paranapanema River, Paraná River Basin), São Paulo State, Brazil.

Methods

Fish were collected using multi-panel gill nets. The gills of each fish were washed and examined for copepods using a stereo microscope. The copepods found were stored in 70% ethanol, cleared in lactic acid, and mounted in Hoyer’s medium. Drawings were made with the aid of a microscope equipped with a drawing tube.

Results

The new copepod species can be distinguished from its two congeners, Rhinergasilus piranhus (type-species) Boeger et Thatcher, 1988 and Rhinergasilus digitus Narciso, Brandão, Perbiche-Neves et Silva, 2020, due to its extremely long antennary claw (etymology of the species), being longer than the other antennary segments; third leg lacking any interpodal plate; and third endopodal segment of third leg lacking a distal spine.

Conclusions

Based on the morphological differences, we erected a new species of Rhinergasilus. The new copepod represents the second report of a Rhinergasilus species parasitizing a fish from the Jurumirim Reservoir. It also represents the first report of this genus in P. lineatus.

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Acknowledgements

R.B.N thanks the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the financial support given to the study (132844/2018-4). R.J.S. is supported by FAPESP #2016/50377-1; CNPq #309125/2017-0; CNPq-PROTAX #440496/2015-2.

Funding

This study was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) (Proc. No.: 11/24159–3) from São Paulo State, Brazil.

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Authors and Affiliations

  1. Institute of Biosciences, São Paulo State University (Unesp), Botucatu, São Paulo, Brazil

    Rodrigo Bravin Narciso & Reinaldo José da Silva

  2. Universidade Federal de São Carlos (UFSCAR), São Carlos, São Paulo, Brazil

    Gilmar Perbiche-Neves

Authors
  1. Rodrigo Bravin Narciso
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  2. Gilmar Perbiche-Neves
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  3. Reinaldo José da Silva
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by RBN. The first version of the manuscript was written by RBN and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Rodrigo Bravin Narciso.

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The authors declare that they have no conflicts of interest.

Ethical Approval

This study was approved by the ethics committee of the Institute of Biosciences (CEEA #120). All applicable international, national, and/or institutional guidelines for the use and care of animals were followed.

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All data will be available for consultation. Whenever necessary, they should be requested from the corresponding author. The specimens used for description will be available in specialized scientific collections.

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Narciso, R.B., Perbiche-Neves, G. & da Silva, R.J. Rhinergasilus unguilongus n. sp. (Copepoda: Ergasilidae): A Gill Parasite of the Freshwater Fish Prochilodus lineatus (Valenciennes, 1837) (Actinopterygii: Prochilodontidae) from the Neotropical Region, Brazil. Acta Parasit. 66, 155–162 (2021). https://doi.org/10.1007/s11686-020-00270-7

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