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Pseudocorynosoma enrietti (Molfi & Freitas Fernandes, 1953) (Acanthocephala: Polymorphidae) from Patagonia (Argentina): life cycle, localities, and new host records

Published online by Cambridge University Press:  30 May 2022

C. Rauque Open the ORCID record for C. Rauque [Opens in a new window] ,
V. Flores Open the ORCID record for V. Flores [Opens in a new window]  and
L. Semenas
C. Rauque
Affiliation:
Laboratorio de Parasitología, Instituto de Investigaciones en Biodiversidad y Medioambiente (Consejo Nacional de Investigaciones Científicas y Técnicas – Universidad Nacional del Comahue), Bariloche, Río Negro, Argentina
V. Flores*
Affiliation:
Laboratorio de Parasitología, Instituto de Investigaciones en Biodiversidad y Medioambiente (Consejo Nacional de Investigaciones Científicas y Técnicas – Universidad Nacional del Comahue), Bariloche, Río Negro, Argentina
L. Semenas
Affiliation:
Laboratorio de Parasitología, Instituto de Investigaciones en Biodiversidad y Medioambiente (Consejo Nacional de Investigaciones Científicas y Técnicas – Universidad Nacional del Comahue), Bariloche, Río Negro, Argentina
*
Author for correspondence: V. Flores, Fax. +54294 4422111, E-mail: veronicaroxanaflores@gmail.com
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Abstract

All Pseudocorynosoma species inhabit freshwater environments of the American continent, but little is known about their life cycles. We report Pseudocorynosoma enrietti (Molfi & Freitas Fernandes, 1953) from natural and experimental specimens in Patagonia and identify the intermediate and definitive hosts of its life cycle for the first time in South America. Adult worms were recovered from Anas platyrhynchos (Linnaeus) and from a new definitive host, Coscoroba coscoroba Molina. Naturally infected amphipods, Hyalella patagonica Ortmann, were collected to obtain cystacanths that were fed to Gallus gallus domesticus (Linnaeus) and Anas platyrhynchos. Specimens of P. enrietti are described in detail using light and scanning electron microscopy. A key to species of the genus Pseudocorynosoma is included. Worms are characterized in both sexes by fore-trunk spines, and genital spines in an isolated field. The proboscis has 19–20 hook rows; males have 9–11 (10) hooks per row and females 7–9 (8). Males with four cement glands similar in size. Eggs elongated, with filaments. Experimental male and female worms were recovered from A. platyrhynchos at seven and 14 days, post-infection.

Keywords

TaxonomySouth Americaexperimental infectionscystacanthswaterfowlAnas plathyrynchosCoscoroba coscorobaAnatidaeHyalella patagonicaAmphipoda
Type
Research Paper
Information
Journal of Helminthology , Volume 96 , 2022 , e38
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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