Arthrolycosa (meaning wolf [spider] with joints) is an extinct genus of arachnids, possibly spiders, that lived about 300-250 million years ago.

Fossils have been found Mazon Creek USA, Piesberg in Germany and in the Kirov Oblast region, and the Kamensk-Shakhtinsky of Russia.

[1][2][3][4] A. antiqua is estimated to have a body length of about 2.17 cm[2] and may have preyed upon insects and other smaller animals that lived alongside them.

A. wolterbeeki is the oldest spider known from Germany.

This prehistoric arachnid-related article is a stub.