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Profilicollis chasmagnathi (Acanthocephala) parasitizing freshwater fishes: paratenicity and an exception to the phylogenetic conservatism of the genus?

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Abstract

Polymorphid acanthocephalans are parasites of marine mammals, waterfowl and ichthyophagous birds. Among these, the genus Profilicollis is known to use exclusively decapods as intermediate hosts. Here, we report the first record of living cystacanths of Profilicollis parasitizing the body cavity of a fish host, Oligosarcus jenynsii, inhabiting the freshwater section of an estuarial system, Mar Chiquita coastal lagoon, in south-east Buenos Aires Province, Argentina. In this environment, cystacanths of Profilicollis chasmagnathi have been previously recorded infecting decapod crabs and as transient accidental infections in the gut of some carcinophagous fishes. In the present study, larvae from the crab Neohelice granulata, from the intestine of the estuarine fish Odontesthes argentinensis and from the body cavity of O. jenynsii were morphologically and genetically compared, confirming their identity as P. chasmagnathi, a species characteristic of estuaries and marine coasts along Argentina, Uruguay and Chile. These findings can be interpreted as a possible case of incipient paratenicity for Profilicollis, and a colonization event of freshwater habitats, probably promoted by the highly variable conditions, typical of ecotonal environments. In addition, cystacanths of the genus Polymorphus were also found in O. jenynsii, representing the first record of this genus in Oligosarcus from Argentina.

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Acknowledgements

The authors would like to thank Lic. M. Graziano (Laboratorio de Biología Molecular, Instituto de Investigaciones Marinas y Costeras (IIMyC), UNMdP-CONICET) for her help and advice during the molecular studies, Dr. M. González-Castro (IIMyC) for his help in the capture and determination of the fish in Mar Chiquita and Arroyo Grande, and Mr. P. Urrutia for allowing the samplings to be carried out in his property (Nahuel Rucá lake). Finally, Mr. J. Levy, Mr. S. Cruz and Mrs. L. Fito for their help in the collection of samples.

Funding

This study was financed by the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) (PIP No. 112-201501-00973), the Fondo para la Investigación Científica y Tecnológica (PICT No. 2013) and the Universidad Nacional de Mar del Plata (EXA 1016/20).

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Correspondence to M.A. Rossin.

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All applicable institutional, national and international guidelines for the care and use of animals were followed.

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The authors declare no conflict of interests.

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Section Editor: Shokoofeh Shamsi

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Levy, E., Rossin, M., Braicovich, P. et al. Profilicollis chasmagnathi (Acanthocephala) parasitizing freshwater fishes: paratenicity and an exception to the phylogenetic conservatism of the genus?. Parasitol Res 119, 3957–3966 (2020). https://doi.org/10.1007/s00436-020-06825-x

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  • DOI: https://doi.org/10.1007/s00436-020-06825-x

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