Redescription of Parspina argentinensis (Szidat, 1954) (Digenea: Cryptogonimidae) from freshwater fishes (Pimelodidae) in the basins of the Paraná and La Plata Rivers, Argentina, with comments on P. bagre Pearse, 1920 (original) (raw)

Abstract

The type-specimens of Parspina argentinensis (Szidat, 1954) from Pimelodus maculatus Lacépède, and new material from Iheringichthys labrosus (Lütken), Parapimelodus valenciennis (Lütken), Pimelodella gracilis (Valenciennes), Pimelodus albicans (Valenciennes), P. argenteus Perugia and P. maculatus caught in the basins of the La Plata and Paraná Rivers, Argentina, were studied to elucidate its taxonomic status. The type-specimens of Parspina bagre Pearse, 1920 from Pimelodella metae Eigenmann in Lake Valencia, Venezuela, were also studied and new observations on its morphology recorded. The amendation of the generic diagnosis of Parspina Pearse, 1920 is proposed based on the study of both species, which revealed, among other features, the absence of a thin walled-membrane enclosing the male terminal genitalia. Parspina argentinensis is characterised by the following features: absence of a gonotyl; presence of a bipartite seminal vesicle, pars prostatica and ejaculatory duct; caeca of nearly equal length; uterus extending from the level of the ventral sucker to end of body; testes symmetrical to slightly oblique; ovary transversely elongate, compact and variable in shape; and the utilisation of a wide range of freshwater fishes as hosts. The tegumental surface of this species is covered with pectinate spines arranged quincuncially. Spines decrease in size and density from forebody to hindbody. There are two types of sensory papillae, ciliated and dome-shaped. Ciliated papillae are distributed on the surface of the oral region and on the dorsal and ventral surfaces of the body, whereas dome-shaped papillae are found on the surface of the ventral rim of the oral sucker associated with a ciliated papilla. Gland-duct openings are interspersed with the spines of the oral crown. In addition, the infection indices of P. argentinensis vary widely, not only among different hosts but also between the Paraná and La Plata River basins. Higher prevalences of P. argentinensis are recorded in the La Plata River, and Pimelodus albicans, P. maculatus and Iheringichthys labrosus are the principal final hosts in this area.

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Acknowledgements

We are grateful to Dr M. Hamann and Lic. L. Spatz for their help in the dissection of fishes, and to Dr R. A. Bray for supplying important literature. Special thanks also go to Dr Pat Pillit (USNPC) for the loan of Parspina bagre and to the two anonymous referees for their valuable comments that helped to improve this manuscript. This research was supported by CONICET (Grant PIP No. 5974), ANPCyT (Proj. BID 1728 OC-AR PICT No. 825) and the Universidad de Buenos Aires (Grants UBACyT-X443 and X453).

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Authors and Affiliations

1. Laboratorio de Helmintología, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Universidad de Buenos Aires, Pabellón II, 4º Piso, Int. Güiraldes 2160, C1428EGA, Buenos Aires, Argentina
   Margarita C. Ostrowski de Núñez, Nathalia J. Arredondo & Alicia A. Gil de Pertierra
2. Laboratorio de Invertebrados I, Facultad de Ciencias Exactas y Naturales, Pabellón III, Universidad Nacional de La Pampa, Av. Uruguay 151, 6300, La Pampa, Argentina
   Irene L. Doma

Authors

1. Margarita C. Ostrowski de Núñez
2. Nathalia J. Arredondo
3. Irene L. Doma
4. Alicia A. Gil de Pertierra

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Correspondence toMargarita C. Ostrowski de Núñez.

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Ostrowski de Núñez, M.C., Arredondo, N.J., Doma, I.L. et al. Redescription of Parspina argentinensis (Szidat, 1954) (Digenea: Cryptogonimidae) from freshwater fishes (Pimelodidae) in the basins of the Paraná and La Plata Rivers, Argentina, with comments on P. bagre Pearse, 1920.Syst Parasitol 78, 27–40 (2011). https://doi.org/10.1007/s11230-010-9274-7

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• Received: 10 June 2010
• Accepted: 13 July 2010
• Published: 15 December 2010
• Issue date: January 2011
• DOI: https://doi.org/10.1007/s11230-010-9274-7

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