Occurrence map for Theodoxus spp. in Asia. All points conform to specimens used in the phylogenetic analyses (Suppl. material 1: Table S1), except for T. gloeri for which no molecular data are available and only the type and paratype localities are indicated. Species are partitioned across four identical maps (A–D) to limit overlap of points as far as possible. Barring T. gloeri, closer related species are grouped together (Fig. 2).