Six-eyed sand spiders out of southern Africa and South America, and related to the recluses, which is the relevant biological fact.
The venom is cytotoxic and extremely potent, more so than Loxosceles by laboratory measure, and there is no antivenom. That reads alarming, and the mitigating fact is real: they are sedentary sand-buriers that flee rather than confront, and verified human envenomations are vanishingly rare. Both things are true and both belong in the same paragraph.
Husbandry is straightforward. Fine sand, minimal moisture, and they will bury and wait indefinitely. Supply is irregular, and this is very much a keeper's animal rather than a display one, because you will mostly be looking at sand.