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Untangling convoluted taxonomy of Chambriella Rego, Chubb & Pavanelli, 1999 (Cestoda: Proteocephalidae), with erection of Riggenbachiella n. g. and the description of a new species from pimelodid catfishes in the Neotropical Region

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Abstract

As part of a complex revision of proteocephalid cestodes parasitic in freshwater bony fishes of the Neotropical Region, the genus Chambriella Rego, Chubb & Pavanelli, 1999 is redefined based on detailed examination of type-specimens and newly collected material of both nominal species of the genus. This examination revealed that the type-species C. agostinhoi (Pavanelli & Santos, 1992) from Zungaro jahu (Ihering) (type-host) and Z. zungaro (Humboldt) is indistinguishable from Lenhataenia megacephala (Woodland, 1934) from Sorubimichthys planiceps (Spix & Agassiz) (all hosts Siluriformes: Pimelodidae), the type- and only species of the genus. New molecular data (partial sequences of the large subunit nuclear ribosomal RNA gene) support the conspecificity of these taxa. As a result, Lenhataenia de Chambrier & Scholz, 2008 becomes a junior synonym of Chambriella and its type-species, C. agostinhoi, a junior synonym of C. megacephala (Woodland, 1934) n. comb. The second species of Chambriella, C. paranaensis (Pavanelli & Rego, 1989) from Hemisorubim platyrhynchos (Valenciennes), is transferred to a new genus, Riggenbachiella n. g., as R. paranaense (Pavanelli & Rego, 1989) n. comb. Riggenbachiella amazonense n. sp. (syn. Chambriella sp. of de Chambrier & Scholz, 2008) from S. planiceps (type-host), Phractocephalus hemioliopterus (Bloch & Schneider) and Z. zungaro is described and designated as the type-species of the new genus. Riggenbachiella n. g. is placed in the subfamily Monticelliinae Mola, 1929, because of the cortical position of the testes, ovary, vitelline follicles and uterus, and is mainly characterised by the possession of a sigmoid cirrus-sac with voluminous, chambered internal seminal vesicle, and bi-loculate suckers.

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Acknowledgements

The authors are indebted to Amilcar Arandas Rego (Instituto Oswaldo Cruz, Rio de Janeiro, Brazil), Roman Kuchta (Institute of Parasitology, České Budějovice, Czech Republic), Sophie de Chambrier and Sandrine Coquille (Natural History Museum, Geneva, Switzerland), Carlos Alfonso Mendoza-Palmero (Universidad Nacional Autónoma de México, Mexico City, Mexico) and Martin Mortenthaler (Aquarium Río Momón, Iquitos, Peru) for their invaluable help with collection and dissection of fish. Thanks are also due to Jan Brabec (Institute of Parasitology, České Budějovice, Czech Republic) and Andrea Waeschenbach (Natural History Museum, London, UK) for providing unpublished sequences and help with their analyses, to Daniel Barčák and Mikuláš Oros (both from Slovak Academy of Sciences, Košice, Slovak Republic) for assistance with the SEM images, and to André Puiz, Janik Pralong and Gilles Roth (all from Natural History Museum, Geneva) for their technical help. Special thanks are extended to Marcelo Knoff (curator of CHIOC, Rio de Janeiro, Brazil) for the loan of paratypes of species of Chambriella. Two reviewers including Alicia A. Gil de Pertierra (Universidad de Buenos Aires, Argentina) provided very helpful suggestions. This study is part of the PhD thesis of the first author (PVA).

Funding

This study was supported by the ‘Ciência sem fronteiras’ Brazilian programme, visitant researcher modality (No. 135/2012) (stays of TS in Brazil at the Universidade Federal Rural do Rio de Janeiro in 2013–2015) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) grants to JLL (Nos. 474077/2011-0, 304254/2011-8, 402665/2012-0), National Science Foundation PBI awards Nos. 0818696 and 0818823, Institute of Parasitology (institutional support RVO 60077344), and Czech Science Foundation (P505/12/G112). PVA was supported by a postgraduate fellowship from CNPq.

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  1. Programa de Pós-Graduação em Biologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil

    Philippe Vieira Alves

  2. Department of Invertebrates, Natural History Museum, Geneva, Switzerland

    Alain de Chambrier

  3. Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil

    José Luis Luque

  4. Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, České Budějovice, Czech Republic

    Tomáš Scholz

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  1. Philippe Vieira Alves
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This article was registered in the Official Register of Zoological Nomenclature (ZooBank) as 404EDA94-5CAC-4C59-9623-2B0D08ED1F3B. This article was published as an Online First article on the online publication date shown on this page. The article should be cited by using the doi number. This is the Version of Record.

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Alves, P.V., de Chambrier, A., Luque, J.L. et al. Untangling convoluted taxonomy of Chambriella Rego, Chubb & Pavanelli, 1999 (Cestoda: Proteocephalidae), with erection of Riggenbachiella n. g. and the description of a new species from pimelodid catfishes in the Neotropical Region. Syst Parasitol 94, 367–389 (2017). https://doi.org/10.1007/s11230-017-9700-1

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