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Description Of The Pulli Stages Of Telotha Henselii (von Martens, 1869) (isopoda, Cymothoidae), With New Hosts And Locality Records From Uruguay And Argentina

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[This paper gives the first full description of the pulli stages of Telotha henselii, and reports both novel locations and novel hosts for this species. These isopods were found on the gills of various catfish (Pimelodella laticeps, Pimelodus clarias, and Rhamdia quelen), on a killifish (Cynolebias prognathus), and on a cichlid (Gymnogeophagus sp.) from the department of Rocha, Uruguay (1977- 1996), as well as on a shrimp (Palaemonetes argentinus) from the province of Entre Ríos, Argentina (1996). Sampling took place in spring, summer, and autumn; adults were found in all samples, whereas the early stage pulli I and II were found only in summer. One or two specimens were found on each host, and in the latter case there was only one specimen per gill chamber. Female parasites were more abundant than males. In gill chambers infected by T.henselii no other metazoan parasites were found, and extensive haemorrhages were observed in both the branchial arches and the filaments. The highest diversity in hosts of T. henselii has been found in southern Brazil and in Uruguay, where at least 10 different genera have been recorded; this ecological pattern of association might be explained by the process of co-accomodation.

Este artículo provée la primera descripción completa de los estadios pulli de Telotha henselii, y reporta tanto nuevas localidades como nuevos hospedadores para esta especie. Los isópodos fueron encontrados en branquias de diversos bagres (Pimelodella laticeps, Pimelodus clarias y Rhamdia quelen), en un pez anual (Cynolebias prognathus) y en un cíclido (Gymnogeophagus sp.) del Departamento de Rocha, Uruguay (1977-1996), y en un camarón (Palaemonetes argentinus) de la Provincia de Entre Ríos, Argentina (1996). El muestreo se llevó a cabo en primavera, verano y otoño; se encontraron adultos en todas las muestras, mientras que los estadios tempranos pullus I y II sólo fueron hallados en verano. Se encontraron de uno a dos especímenes por hospedador, y en este último caso sólo hubo un especimen por cámara branquial. Entre los parásitos, las hembras fueron más abundantes que los machos. En las cámaras branquiales infectadas por T. henselii no se encontraron otros metazoos parásitos, y se observaron hemorragias extensas tanto en arcos como en filamentos branquiales. La mayor diversidad de hospedadores de T. henselii se ha encontrado en el sur de Brasil y en Uruguay, donde se han reportado por lo menos diez géneros diferentes; este patrón ecológico de asociación podría explicarse por el proceso de coacomodación., This paper gives the first full description of the pulli stages of Telotha henselii, and reports both novel locations and novel hosts for this species. These isopods were found on the gills of various catfish (Pimelodella laticeps, Pimelodus clarias, and Rhamdia quelen), on a killifish (Cynolebias prognathus), and on a cichlid (Gymnogeophagus sp.) from the department of Rocha, Uruguay (1977- 1996), as well as on a shrimp (Palaemonetes argentinus) from the province of Entre Ríos, Argentina (1996). Sampling took place in spring, summer, and autumn; adults were found in all samples, whereas the early stage pulli I and II were found only in summer. One or two specimens were found on each host, and in the latter case there was only one specimen per gill chamber. Female parasites were more abundant than males. In gill chambers infected by T.henselii no other metazoan parasites were found, and extensive haemorrhages were observed in both the branchial arches and the filaments. The highest diversity in hosts of T. henselii has been found in southern Brazil and in Uruguay, where at least 10 different genera have been recorded; this ecological pattern of association might be explained by the process of co-accomodation.

Este artículo provée la primera descripción completa de los estadios pulli de Telotha henselii, y reporta tanto nuevas localidades como nuevos hospedadores para esta especie. Los isópodos fueron encontrados en branquias de diversos bagres (Pimelodella laticeps, Pimelodus clarias y Rhamdia quelen), en un pez anual (Cynolebias prognathus) y en un cíclido (Gymnogeophagus sp.) del Departamento de Rocha, Uruguay (1977-1996), y en un camarón (Palaemonetes argentinus) de la Provincia de Entre Ríos, Argentina (1996). El muestreo se llevó a cabo en primavera, verano y otoño; se encontraron adultos en todas las muestras, mientras que los estadios tempranos pullus I y II sólo fueron hallados en verano. Se encontraron de uno a dos especímenes por hospedador, y en este último caso sólo hubo un especimen por cámara branquial. Entre los parásitos, las hembras fueron más abundantes que los machos. En las cámaras branquiales infectadas por T. henselii no se encontraron otros metazoos parásitos, y se observaron hemorragias extensas tanto en arcos como en filamentos branquiales. La mayor diversidad de hospedadores de T. henselii se ha encontrado en el sur de Brasil y en Uruguay, donde se han reportado por lo menos diez géneros diferentes; este patrón ecológico de asociación podría explicarse por el proceso de coacomodación.]

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/content/journals/10.1163/156854003321672809
2003-01-01
2016-12-08

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