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۱New Digenean Parasite Infecting the Freshwater Fish, Clarias gariepinus with Special Reference to its Tegumental Ultrastructure
نویسنده(ها): ، ، ، ، ،
اطلاعات انتشار: World Applied Sciences Journal، بيست و ششم،شماره۸، ۲۰۱۳، سال
تعداد صفحات: ۷
The following Lepocreadiid species are described. Fifty Clarias gariepinus fish samples were collected from Giza Province, Egypt, during the period from October 2010 to January 2011. It is found that, 12 out of 50 (24.5 %) fish were found to be naturally infected with a new species (Pseudoholorchis clarii) that is named according to the host harboring this parasite which is distinguished from other species of the same genus by some interspecific variations. The tegument of the present species consists of an outer syncytial layer which is folded into a series of ridges and grooves. The syncytial layer (external layer) is connected to the nucleated internal region across the fibrous discontinuous middle layer. The folds are interrupted by numerous cuticular spins; each one is enclosed at the apex and at the base by the corresponding unit membrane. The inner nucleated layer is consisted of epidermal cells arranged in two levels. The cells are conical in shape and have a large nucleus with prominent nucleoli. Large vacuoles are also observed between the epidermal cells containing granules of different shapes and sizes.
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