Amphinectidae is an austral (Southern Hemisphere) spider family. It includes both cribellate and ecribellate taxa. The family includes 159 species (Platnick 2013), with the largest number from New Zealand, followed by Australia and then temperate South America.
Just one species occurs in North America, Metaltella simoni (a species that was at one time placed in the family Dictynidae, then Amaurobiidae, before finding a home in Amphinectidae). The natural distribution of M. simoni is believed to be Argentina, Brazil, and Uruguay, but it has been established in the United States from Florida to Texas for many years, with the first U.S. record from Louisiana in 1944. More recently, it has become established in southern California (Vetter et al. 2008) and has been found in Alberta, Canada (in a greenhouse) and in North Carolina. (Cutler 2005 and references therein). In North America, M. simoni is usually associated with human-altered habitats. It builds a tangled cribellate web under debris and adult males sometimes wander away from the retreat. Because of the relatively large size of this spider, the cribellum is sometimes visible with a magnifying glass. (Bradley 2013)