Echinostoma sp. IG, drawings of live cercaria. A. Body, ventral view. B. Tail, lateral view (note that only one of the two ventro-lateral fin-folds is illustrated). C. Head collar. D. Schematic illustration of the para-oesophageal gland-cells. Abbreviations: d, dorsal fin-fold; v, ventral fin-fold. Scale-bars: A, B, 100 μm; C, 50 μm.