Sitting in a big sandy patch, no structure anywhere around. many of them just sitting there.
Darkish spot near the tail, a round white spot above each gill, darker mark between the eyes. Small white spots along the length of the body. He is just asking to be identified!
Coastal Morning Glory but then what is it doing in Pretoria? Found in highly disturbed ground next to a soil tip. Doing very well curling up the khaki weed (Alternanthera pungens) and sprawling over the ground. Thought it was I. purpurea to start with but the leaves rule it out. Maybe a garden escape.
https://www.inaturalist.org/observations/191980472
Observation of the spider.