Black Hole Spider (Kukulcania arizonica)

A velvet ambush specialist hiding in plain sight

Kukulcania arizonica, the Black Hole Spider (also called the Southern House Spider), is one of the most underrated arachnids in the desert Southwest: a stocky, velvety filistatid that builds a tubular silk retreat down in a crack or crevice, lays a beautiful “starburst” of trip-lines around the entrance, and ambushes whatever stumbles in. Females are big, dark, and routinely mistaken for little tarantulas; males are leggier and lighter.

These are primitive spiders with reduced venom and absolutely zero interest in you; a bite is rarer than a paper cut and about as exciting. Which makes it a perfect “real spider, no drama” display animal: set it up with cork and crevices, leave it alone, and watch it engineer its silk fort. Quietly fascinating, dirt-easy, and not what anyone expects.

The numbers live in the care guide. Enclosure size, temps, humidity, feeding schedule, premolt signs, handling boundaries: it's all in the care guide for this exact fella. Start with the full Advanced guide, or click for the quick Open the Simple version →