Frequency of ontogenetic stages in the subhemocoelic brood pouches of female Tarebia granifera (Lamarck, 1816) (morph B) depending on occurrence in Thailand. Blue dots: mitochondrial clade A; pink dots: mitochondrial clade B. Size classes are assigned different colours in the pie charts (see legend) and rivers are coloured according to drainage systems; numbers at the pie charts refer to the total number of dissected specimens and the number of gravid females (in parentheses). The small letters refer to the stations Chiang Mai (a), Ko Samui (b) and Phuket (c) for which meteorological data representing the different climatic regions of Thailand were analysed (see Fig. 12).