[3] Idiopidae build burrows, and some species close these with a trapdoor lined with silk.

Prothemenops siamensis from Thailand, which is about 2 cm long, builds its retreat in a streamside vertical earth bank in lower montane rainforest.

The trapdoor is a form of safety and ways of ambushing prey.

In most species the males have a spur on their legs, which is used to immobilise the female and prevent her from biting during the mating process.

[6] As of 2019, the World Spider Catalog accepted the following genera:[7] This Idiopidae article is a stub.