A new species of Himalayapotamon Pretzmann, 1966 (Crustacea: Brachyura: Potamidae) marking the westernmost distribution of the genus, with notes on its geographical range evolution. Issue 47 (25th December 2018)

• Record Type: Journal Article
• Authors: Klaus, Sebastian; Brandis, Dirk
• Is Part Of: Journal of natural history. Volume 52:Issue 47/48(2018)
• Page Start: 2993
• Page End: 3004
• Publication Date: 2018-12-25
• Subjects: freshwater crab -- Potaminae -- taxonomy -- biogeography -- Sohan River -- vicariance; Natural history -- Periodicals; 508
• DOI: 10.1080/00222933.2019.1568603
• Languages: English
• ISSNs: 0022-2933

Abstract

ABSTRACT: We describe a new species of freshwater crab, Himalayapotamon robertsianum sp. nov. from Punjab province of Pakistan, based on morphological characters of the carapace and the first gonopod. The new species demarcates the westernmost distribution limit of the genus. Additionally, we analysed partial sequences of the 16S rRNA locus for some 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: we assume an ancestral widespread distribution of Himalayapotamon in the palaeo-Ganges. When drainage rearrangement diverted the western tributaries of the Ganges into the Indus since the latest Miocene, Himalayapotamon diverged into two clades. Consequently, the western clade is now sharing the Indus drainage with Potamon . urn:lsid:zoobank.org:pub:80B52E6C-0120-4669-A6B0-9F0DA5918EE3