See text Ctenizidae (/ˈtənɪzədiː/ tə-NIZZ-ə-dee)[2] is a small family of mygalomorph spiders that construct burrows with a cork-like trapdoor made of soil, vegetation, and silk.

The name comes from the distinctive behavior of the spiders to construct trapdoors, and ambush prey from beneath them.

[citation needed] The family Ctenizidae was first described by Thorell in 1887, being based on the genus Cteniza.

Even so, the family was not monophyletic, since Stasimopus is not in the same clade as the other two genera, according to a 2018 study (the three genera left in the Ctenizidae at that time are shaded in yellow):[6] Stasimopus Heteromigas (Migidae) Idiops (Idiopidae) Myrmekiaphila (Euctenizidae) Cteniza Cyrtocarenum Halonoproctidae In 2020, a large scale molecular phylogenetic study confirmed the placement of Stasimopus outside the clade consisting of Cteniza and Cyrtocarenum, and transferred it to its own family, Stasimopidae.

[5] This placement is accepted by the World Spider Catalog as of February 2022[update].