[2] They are haplogyne spiders, related to the Dysderidae and placed in clade or superfamily Dysderoidea.

[1] The leg structure appears to be an adaptation for living in silken tubes.

Unlike those of the atypical tarantulas, these tubes may branch and are often built in tree bark fissures, as well as under stones.

[2] As of July 2021[update], the World Spider Catalog accepts the following genera:[2] The oldest unambiguous members of the family are known from the Eocene Baltic amber.

[3] Cretaceous taxa Denticulsegestria, Jordansegestria, Jordariadna, Lebansegestria, Microsegestria, Myansegestria, Palaeosegestria and Parvosegestria, originally described as tube-dwelling spiders, might be members of the stem group of Segestriidae or stem dysderoids instead.