Distribution of Gudeodiscus Páll-Gergely, 2013 species. Legends: filled triangle, top down: typical Gudeodiscus (Gudeodiscus) phlyarius (Mabille, 1887), filled triangle, top up: “Gudeodiscus phlyarius werneri Páll-Gergely, 2013” (synonym of phlyarius); empty triangle, top up: G. (G.) phlyarius populations showing transitional characters towards werneri in terms of shell shape; empty triangle, top down: atypical G. (G.) phlyarius; empty circle: Gudeodiscus messageri raheemi ssp. n., filled circle: G. (G. ?) hemmeni sp. n. (in all localities it co-occurs with G. (G.) messageri raheemi ssp. n.); circle with filled triangle in the middle: co-occurrence of G. (G.) messageri raheemi ssp. n. and atypical G. (G.) phlyarius. The shaded area indicates the area inhabited by G. (G.) messageri messageri (Gude, 1909) and “anterides”, “fallax” and “gouldingi”-like populations of G. (G.) phlyarius. Filled square indicates the position of Phong-Tho, the type locality of Plectopylis verecunda Gude, 1909 (synonym of G. phlyarius). Numbers 1–3 refer to atypical populations assigned to G. (G.) phlyarius. For explanation, see text.