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Neotropical Monogenoidea. 57. Revision and phylogenetic position of Scleroductus Jara & Cone, 1989 (Gyrodactylidae), with descriptions of new species from the Guatemalan chulin Rhamdia guatemalensis (Günther) (Siluriformes: Heptapteridae) in Mexico and the barred sorubim Pseudoplatystoma fasciatum (Linnaeus) (Siluriformes: Pimelodidae) in Brazil

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Abstract

The diagnosis of Scleroductus Jara & Cone, 1989 (Gyrodactylidae) is amended to include viviparous species having a large spine associated with the ejaculatory duct within the male copulatory organ, two band-like projections originating from the posterior margin of the superficial bar and hooks evenly distributed along the haptoral margins. Two new species of Scleroductus are described from the external surfaces of siluriform fishes of Mexico and Brazil: Scleroductus lyrocleithrum n. sp. from the Guatemalan chulin Rhamdia guatemalensis (Günther) (Heptapteridae) in a cenote on the Yucatan Peninsula, Mexico; and Scleroductus angularis n. sp. from the barred sorubim Pseudoplatystoma fasciatum (Linnaeus) (Pimelodidae) in the Rio Tocantins, Tocantins, Brazil. Scleroductus sp. is recorded from the jundiá Rhamdia quelen (Quoy & Gaimard) (Heptapteridae) in the Iguaçu drainage of southern Brazil. Phylogenetic analyses of 18S rDNA suggest that Scleroductus (represented in the analyses by Scleroductus sp. from R. quelen), Ieredactylus Schelkle, Paladini, Shinn, King, Johnson, van Oosterhout, Mohammed & Cable, 2011 (represented by its type-species) and Gyrodactyloides Bychowsky, 1947 (represented by G. bychowskii Al’bova, 1948) comprise the sister taxon to the remaining viviparous gyrodactylids, with Scleroductus serving as the sister group to Ieredactylus + Gyrodactyloides. The clade containing the three taxa is supported by two putative synapomorphic features: two band-like projections (R1 sclerites) originating from the posterior margin of the superficial bar and a large spine associated with the ejaculatory duct within the male copulatory organ.

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Acknowledgements

The authors gratefully acknowledge the following individuals and agencies for support during the present study: F. Puc Itza and G. Arjona-Torres from the Center for Investigation and Advanced Studies, National Polytechnic Institute (CINVESTAV-IPN), Mérida, Yucatan, Mexico, assisted during the collection of fish hosts in Mexico; Elineide Marques, Sérgio Agostinho, Paulo Lucinda, Gilmar Pereira, Gilberto Sousa, Anderson Soares and Iriene Freitas, all from the Núcleo de Estudos Ambientais, Universidade Federal de Tocantins [NEAMB (UFT)], Porto Nacional, Tocantins, Brazil, collected and identified catfishes from the Rio Tocantins; and Stanley K. King provided specimens of Ieredactylus rivuli fixed in ethanol for molecular characterisation. Partial financial support was provided through grants from the Fundação Araucária (no. 932) and Conselho Nacional de Pesquisa (CNPq) (no. 477293/04–2).

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Authors and Affiliations

  1. Health Education Program, School of Health Professions, Campus Box 8090, Idaho State University, Pocatello, Idaho, 83209, USA

    Delane C. Kritsky

  2. Laboratório de Parasitologia Evolutiva, Departamento de Zoologia, Universidade Federal de Paraná, Curitiba, Paraná, Brazil

    Walter A. Boeger

  3. Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Curitiba, Brazil

    Walter A. Boeger

  4. Institute of Ecología, Pesquerías y Oceanografía del Golfo de México (EPOMEX), Universidad Autónoma de Campeche, A. Agustín Melgar S/N Col. Buenavista, C. P. 24039, San Francisco de Campeche, Campeche, Mexico

    Edgar F. Mendoza-Franco

  5. Laboratório de Ictioparasitologia e Sistemática, Universidade Federal de Santa Catarina, Campus Curitibanos, Rodovia Municipal Ulisses Gaboardi, Km 3, Caixa Postal 101, CEP: 89.520-000, Curitibanos, Santa Catarina, Brazil

    Rogério T. Vianna

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  1. Delane C. Kritsky
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Correspondence to Delane C. Kritsky.

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Kritsky, D.C., Boeger, W.A., Mendoza-Franco, E.F. et al. Neotropical Monogenoidea. 57. Revision and phylogenetic position of Scleroductus Jara & Cone, 1989 (Gyrodactylidae), with descriptions of new species from the Guatemalan chulin Rhamdia guatemalensis (Günther) (Siluriformes: Heptapteridae) in Mexico and the barred sorubim Pseudoplatystoma fasciatum (Linnaeus) (Siluriformes: Pimelodidae) in Brazil. Syst Parasitol 84, 1–15 (2013). https://doi.org/10.1007/s11230-012-9387-2

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