Leptonetidae is a family of small spiders adapted to live in dark and moist places such as caves.

[1] The family is relatively primitive having diverged around the Middle Jurassic period.

[2] They are generally pale in color and feature a greenish or bluish shine due to microscopic texture on the cuticle of their exoskeleton.

If a spider from this family looses a leg, it usually separates between the patella and tibia rather than at the coxa/trochanter joint.

[4] Many live in caves or in leaf litter around the Mediterranean, and in Eurasia, Japan and southern North America.