Distribution of Tarebia granifera and trematodes in different river systems in Thailand. a. Distribution map. b. Comparative table of the occurrence of trematode cercariae in different river systems in Thailand. Black dots with attached pie charts in the map represent sampling sites where trematode infected specimens of T. granifera were found; white dots represent sampling sites where no infections were observed. Colors in the pie charts and the comparative table refer to trematode species/types (see legend inset).