Median Joining networks with COI sequences of the Orcula species endemic to the Alps. The map shows the mountain regions inhabited by the species with colors corresponding to those used in the networks. The clades inferred from the phylogenetic tree analysis are shown in separated networks, numbered from A-F. The node colors correspond to the mountain regions shown on the map (except for the Dinarid Mala Kapela). The full names of the mountain regions are provided in the appendix of Table 1. The areas of the Northern (NCA) and the Southern Calcareous Alps (SCA) are shaded and encircled by black lines. The size of the circles in the networks corresponds to the number of sequences providing the same haplotype. Bars indicate the number of substitutions between nodes.