Parasitología al día
Print version ISSN 0716-0720
PINO, LUZ A.; MORALES, GUSTAVO and MORALES, LUZ AIMARA. QUETOTAXIA CERCARIANA DE LA CEPA CARABALLEDA DE Schistosoma mansoni . Parasitol. día [online]. 1998, vol.22, n.1-2, pp. 11-15. ISSN 0716-0720. doi: 10.4067/S0716-07201998000100002.
By mean of the silver impregnation (2% silver nitrate solution) of a total of 66 Schistosoma mansoni cercariae, coming from Caraballeda locality, Vargas Municipality, Federal District (Venezuela), the number and pattern of disposition of the argentophilic papillae were determined. The average total number of the dorsal papillae was 11.91, the variation coefficient in this side was low: 3.8%. On the ventral surface, the average total number of papillae was 11.46 and the variation coefficient, 7.1%. When the papillae of the ventral surface were divided in 4 quadrants, the variation coefficients were incremented, reaching in one of the anterior quadrants until 20%. In 61.2% of the posterior ventral quadrants of the Caraballeda cercariae presented 4 papillae. In lateral side, the average total number was 17.5 and the variation coefficient resulted lower than 7%. The average total number of papilae on the tall were 21.3 on the dorsal side and 44.8 in total, the variation coefficient in this area was lower than 10%. The presence of 4 papillae in 61.2% of the posterior ventral quadrants is a very important morphological characteristic of the cercariae of Caraballeda S. mansoni strain
Keywords : Schistosoma mansoni; Quetotaxia cercariana; Caraballeda strain; Trematoda.