Selenops brachycephalus is found in Zimbabwe and South Africa. In South Africa, it occurs in Limpopo and Mpumalanga provinces at altitudes ranging from 211 to 1,372 m above sea level.
Known only from the female. Carapacebrown with some darkermarkings radiating forwards and sideways from thoracic stria, those in cephalic portion more strongly defined. Abdomen above dark mottled brown, a few white speckles among the predominating brown ones. Legs brown with some vague bands. Total length 10-12 mm.
The species was originally described by Lawrence in 1940 from Zimbabwe. It was revised by Corronca in 2002. Additional sampling is needed to collect males and to determine the species' complete range.