| Named By: | Hargar in 1874 |
| Time Period: | Late Carboniferous to Late Permian |
| Location: | Russia. USA |
| Size: | Body length about 5 centimetres |
| Diet: | Insectivore |
| Fossil(s): | Few specimens |
| Classification: | | Arthropoda | Arachnida | Araneae | Mesothelae | Arthrolycosidae | |
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 and in the Kirov Oblast region of Russia.
Species of Arthrolycosa are estimated to have grown to a length of 2 inches (5 centimeters) and may have preyed upon insects and other smaller animals that lived alongside them.