A new Species of the Freshwater Crab Genus Himalayapotamon Pretzmann, 1966 (Crustacea, Brachyura, Potamidae)

We describe a new species of freshwater crab, Himalayapotamon robertsianum sp. nov. from Punjab, Pakistan, based on morphological characters of carapace and first gonopod. This species demarcates the westernmost distribution limit of the genus. Additionally, we analysed partial sequences of the 16S rRNA locus for several species of the genus Himalayapotamon (p-distances, Bayesian phylogenetical inference), indicating that Himalayapotamon separates into an eastern and a western clade. Based on these results, we propose a biogeographical scenario that can explain the occurrence of the genera Himalayapotamon and Potamon within the same river system.