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New arrangement of three genera of fish tapeworms (Cestoda: Proteocephalidae) in catfishes (Siluriformes) from the Neotropical Region: taxonomic implications of molecular phylogenetic analyses

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Abstract

Tapeworms (Cestoda: Proteocephalidae) are the dominant component of communities of intestinal parasites in pimelodid and other catfishes (Siluriformes) from South America. Even though these parasites have been studied intensively over more than one century, molecular taxonomy and phylogenetics have questioned their morphology-based classification, thus raising doubts about the systematic value of traits commonly used to circumscribe individual taxa. In the present study, members of three morphologically well-characterized genera of proteocephalids from pimelodid (Hemisorubim platyrhynchos and Sorubim lima) and auchenipterid (Ageneiosus inermis) catfishes from the Paraná or Amazon River basins were subjected to DNA sequencing of the large subunit nuclear ribosomal RNA (lsrDNA) and complete mitochondrial cytochrome c oxidase subunit I (COI). Phylogenetic analyses revealed the sister relationship between Manaosia bracodemoca and Mariauxiella piscatorum, and among Mariauxiella pimelodi and Ageneiella brevifilis. As a result, Mar. piscatorum and A. brevifilis are transferred to Manaosia and Mariauxiella, respectively, as Manaosia piscatorum n. comb. and Mariauxiella brevifilis n. comb., and the genus Ageneiella is suppressed. Diagnoses of Manaosia and Mariauxiella are amended. In addition, the present study revealed misidentification of tapeworms whose sequences are deposited in the GenBank database.

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Acknowledgements

The authors are indebted to Roman Kuchta (Institute of Parasitology, České Budějovice) and Carlos A. Mendoza-Palmero (Masaryk University, Brno) for collecting the specimen of M. piscatorum in Iquitos, Peru in 2009. Our thanks are extended to Jan Brabec (Institute of Parasitology, České Budějovice) for providing unpublished sequences, colleagues of the Laboratory of Fish Parasitology (UFRRJ) who helped with collection and dissection of fishes, and to Nathalia J. Arredondo (Universidad de Buenos Aires) for inspiring discussions about the interrelationships of Manaosia and Mariauxiella.

Funding

This study was supported by the “Ciência sem fronteiras” Brazilian program—visitant researcher modality (No. 135/2012) (stays of TS in Brazil at the Universidade Federal Rural de Rio de Janeiro in 2013–2015). This work was also funded by CAPES (postdoc scholarship to PVA, grant 88887.508591/2020-00), CNPq (research scholarship to JLL, grant 306952/2015-7), NSF-PBI awards (grants 0818696 and 0818823), and the Czech Science Foundation (19-28399-X).

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Correspondence to Philippe V. Alves.

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Alves, P.V., de Chambrier, A., Luque, J.L. et al. New arrangement of three genera of fish tapeworms (Cestoda: Proteocephalidae) in catfishes (Siluriformes) from the Neotropical Region: taxonomic implications of molecular phylogenetic analyses. Parasitol Res 120, 1593–1603 (2021). https://doi.org/10.1007/s00436-021-07138-3

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  • DOI: https://doi.org/10.1007/s00436-021-07138-3

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