Metaltella simoni is native to Argentina, Uruguay, and Brazil but has been introduced to North America via commerce and trade. It is now well-established in the southeastern USA, as well as southern California. Because it is so closely associated with humans, it's possible that it may pop up in other areas on occasion; for example, a pair was once found in a greenhouse in Alberta, Canada, probably having been shipped along with the potted plants. Males and females can sometimes be found together in the same web. Metaltella simoni does not have a common name in North America, however it is often referred to as one of the "Hacklemesh Weavers." It produces cribellate silk and its behavior is quite similar to that of the native "Hacklemesh Weavers" in the family Amaurobiidae. In fact, it was once included in the same family and is still often mistaken for one. The spider lines its retreat with a tangled mesh of hackled silk which entangles hapless insects. As the prey struggles, vibrations are sent through the web, serving as an effective dinner bell! This spider species is often found living under ground debris like logs, boards, and rocks, as well as under tree bark or (most commonly) within crevices in and around man-made structures. Metaltella simoni is quite at home as a synanthrope, but also gets along perfectly fine out in the wild. During mating season, the adult males wander from their webs in order to find a mate; at night, they are often found scurrying across the floor inside homes and other buildings. Egg sacs are roughly globular and are suspended within the web. (Spiders on the Web.)