Stenaelurillus brandbergensis, synonym Mashonarus brandbergensis, is a species of jumping spider in the genus Stenaelurillus that lives in Namibia. It was first described in 2006 by Wanda Wesołowska and placed in the genus Mashonarus but was moved to its current genus in 2018. The spider is medium-sized and black, with a cephalothorax between 1.7 and 2.0 mm (0.067 and 0.079 in) in length and an abdomen between 1.6 and 2.9 mm (0.063 and 0.114 in) long. It is distinguished from other members of the genus by having two broad white stripes that mark both the abdomen and carapace. The epigyne in the female also has shorter insemination ducts than the otherwise similar, though larger, Stenaelurillus guttatus.

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