Abstract
Ballus Koch, 1850 is a beetle-like jumping spider genus encountered in montane evergreen rainforests of the Central and Uva Provinces of Sri Lanka. The taxonomic literature documents three species of the genus for the island. However, neither the taxonomic validity nor the systematics of any of the three species have been previously examined. We used nuclear and mitochondrial DNA sequences (28S rRNA, H3, COI) as well as morphological characters to investigate the genetic and taxonomic diversity of Ballus populations in Sri Lanka, including specimens from type localities. No Ballus specimens were found outside of the central highlands. Results of molecular species delimitation and morphological analysis suggest the presence of only a single species of Ballus in Sri Lanka. We therefore propose B. sellatus Simon, 1900 to be a junior synonym of B. segmentatus Simon, 1900, while B. clathratus Simon, 1901 remains a nomen nudum. Further, we discuss the implications of our results for conservation planning.
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