Producción CyT
VIII International Symposium of Fish Parasite - Two new species of Clestobothrium (Cestoda: Bothriocephalidea), parasites of Merluccius australis and M. hubbsi (Gadiformes: Merlucciidae) from the Patagonian shelf of Argentina
Congreso
Fecha:
2011Editorial y Lugar de Edición:
South American Ictioparasitologist ConsortiumResumen *
The genus Clestobothrium is widespread among the Gadiformes. In the continental shelf of South America have been recorded Clestobothrium sp. and/or C. crassiceps parasitizing Merluccius australis, M. gayi and M. hubbsi. The aim of this work is to determine the taxonomic status of Clestobothrium parasitizing M. australis and M. hubbsi from the Patagonian shelf of Argentina, adding data about the microthrix pattern. The worms found in the intestine were isolated, fixed and processed following helminthological techniques to study internal morphology and with scanning electron microscopy to determine the microthrix pattern. Two new species of bothriocephalids, Clestobothrium sp. 1 from M. australis and Clestobothrium sp. 2 from M. hubbsi are described. Clestobothrium sp. 1 can be typified by the following features: a medium-size strobila with 410-528 proglottides, 49-90 testes per mature proglottis, partially surrounding the ovary posteriorly; a transversely elongated genital pore situated anterior to spurious articulations; presence of a genital atrium; a globular cirrus-sac occupying 4-6% of mature proglottis width and a vagina with sphincter. Clestobothrium sp. 2 is characterised by its small size; 71-219 proglottides; 39-64 testes per mature proglottis, usually surrounding completely the ovary posteriorly; a rounded genital pore situated at the same level of spurious articulations; and an oval cirrus-sac occupying 8-16% of mature proglottis width. Clestobothrium sp. 2 shares with Clestobothrium sp. 1 the number of osmoregulatory canals (6) and the type and distribution of microtriches, except for the central surface delimited by the 2 lips. Clestobothrium crassiceps differs from the 2 new species in the number of testes, the absence of genital atrium and vaginal sphincter, and the number of osmoregulatory canals (4). Información suministrada por el agente en SIGEVAPalabras Clave
MERLUCCIUSCLESTOBOTHRIUMARGENTINAPATAGONIAN SHELF