After a couple of days the spot will burst open and start ulcerating. The infected wound would heal very slowly and often a second infection is very likely. Depending on the species the bite can be accompanied by fevers, malaise and heavy headaches. Clubionidae have long legs with dark brown to black scopulae. The chelicerae are long, stout and black.
Some species have chevron-markings on their abdomen.
The eyes are small and all about the same size and placed in two horizontal lines. In Clubiona leg 4 is the longest, while with Cheiracanthium it's leg 1. The ground dwelling species of Clubionidae are a group of dark, medium-sized spiders with slender legs. Some species, like Castianeira and Copa, look like ants, while others, like Graptarta, look like wasps. Sac spiders are free-dwelling, aggressive hunters.