Three New Species of Cosmetocleithrum (Monogenea: Dactylogyridae) Gill Parasites of Trachelyopterus galeatus (Siluriformes: Auchenipteridae) in Southeastern Brazil

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Abstract

Purpose

To describe three new species of Cosmetocleithrum in the gills of Trachelyopterus galeatus (Siluriformes, Auchenipteridae) from Aguapeí River, Upper Paraná River basin, São Paulo State, Brazil.

Methods

Fifty-three specimens of T. galeatus were captured in the mouth of the Aguapeí River from August 2013 to June 2014. Monogeneans were mounted unstained in Hoyer’s and Gray and Wess’s medium.

Results

Cosmetocleithrum spathulatum sp. n., Cosmetocleithrum baculum sp. n., and Cosmetocleithrum galeatum sp. n. differ from all known congeneric species mainly in the morphology of the accessory piece (i.e. spatulate-shaped, claviform, and a straight rod with hook-shaped distal portion, respectively). Also, the three new species share hooks with different sizes with hooks pairs 5 and 7 bigger than others and with an erect delicate point, inconspicuous thumb, longer shaft, and slender shank.

Conclusions

To date, 18 species of Cosmetocleithrum were recognised parasitizing siluriforms in the Neotropical region. The present study expands the number to 21 species, however, despite this increase, the number of known taxa of monogeneans in neotropics is far from representing the ideal situation.

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Data Availability

The datasets of the present study are available from the corresponding author.

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Acknowledgements

We are so grateful to the São Paulo Energy Company (CESP) for the facilities offered for the development of this work.

Funding

The authors thank the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) for the scholarship granted to P.O.F.Y. #2013/25786-7 and F.H.Y. #2011/22603-3; 2014/14298-4. R.J.S. is supported by CNPq-PROTAX #440496/2015-2; FAPESP #2016/50377-1; and CNPq #309125/2017-0.

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POFY concept of the manuscript, data collection, collection, and preservation of the material, identified the parasites species, performing morphometrical analysis and wrote the manuscript; FHY identified the species, performing morphometrical analysis and editing the manuscript; and RJS concept of the manuscript, data collection, identified the parasites species and editing the manuscript.

Corresponding author

Correspondence to Priscilla de Oliveira Fadel Yamada.

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de Oliveira Fadel Yamada, P., Yamada, F.H. & da Silva, R.J. Three New Species of Cosmetocleithrum (Monogenea: Dactylogyridae) Gill Parasites of Trachelyopterus galeatus (Siluriformes: Auchenipteridae) in Southeastern Brazil. Acta Parasit. (2020). https://doi.org/10.1007/s11686-020-00282-3

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Keywords

  • Aguapeí River
  • Ancyrocephalinae
  • Catfishes
  • Neotropical region
  • Paraná River basin