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Taxonomic status of Rhabdochona ictaluri (Nematoda: Rhabdochonidae) based on molecular and morphological evidence

  • Fish Parasitology - Original Paper
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Abstract

The genus Rhabdochona includes more than 100 species infecting freshwater fishes in all zoogeographical regions of the world. In Mexico, 12 nominal species of Rhabdochona have been recorded. Of these, Rhabdochona ictaluri was originally described as a parasite of endemic catfishes of the family Ictaluridae; however, the species was later considered on morphological grounds as a junior synonym of Rhabdochona kidderi. In this study, newly sampled specimens of R. ictaluri were obtained from the type host and type locality and were used to perform a detailed morphological analysis and molecular phylogenetic inferences through one mitochondrial and two nuclear genes; data were used in an integrative taxonomy context to test the taxonomic status of R. ictaluri. This approach proved to be very useful to confirm the validity of this species, and robust species limits were established between these two putative species considering morphology, molecular data, host association, and biogeography.

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Acknowledgments

We thank Jaime Guzmán, Ramón Valdez, and Saúl Montoya for their help during field work; Luis García for the loan of specimens of Rhabdochona ictaluri and R. kidderi deposited in the CNHE, and for providing helpful bibliographic references; Berenit Mendoza for the preparation of specimens for SEM, and Laura Márquez for support obtaining DNA sequences.

Funding

This project was partially funded by the program PAPIIT-UNAM IN218414 to GR and IN202617 to GPPL. OLC, AOSV, and DIHM wish to thank the Consejo Nacional de Ciencia y Tecnología (CONACyT) for granting scholarships to complete their graduate programs.

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Correspondence to Rogelio Aguilar-Aguilar.

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The authors declare that they have no conflict of interest.

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Section Editor: Simonetta Mattiucci

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Lagunas-Calvo, O., Santacruz, A., Hernández-Mena, D.I. et al. Taxonomic status of Rhabdochona ictaluri (Nematoda: Rhabdochonidae) based on molecular and morphological evidence. Parasitol Res 118, 441–452 (2019). https://doi.org/10.1007/s00436-018-6189-8

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  • DOI: https://doi.org/10.1007/s00436-018-6189-8

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