| studies on the morphology of cercariae obtained from freshwater snails at erawan waterfall, erawan national park, thailand. | the morphology of cercariae of freshwater snails from erawan waterfall, erawan national park, kanchanaburi province was studied between december 2002 and august 2003. the snail samples were collected by handpicking using a counts per unit of time sampling method. the cercariae, larva stage of a trematode, were investigated using the shedding method where they were categorized into three groups and six species. the first group, pleurolophocercous cercariae, consists of haplorchis pumillo (c1) and ... | 2007 | 17539280 |