41, see text Aptostichus is a genus of North American mygalomorph spiders in the family Euctenizidae, and was first described by Eugène Simon in 1891.

[3] They are found predominantly in southern California, United States.

[2][4] Members of the North American genus, Aptostichus, assemble tunnels with side chambers, but they do not close these chambers with additional trapdoors.

[5] As of May 2019[update] it contains forty-one species in the United States and Mexico:[1]

This Euctenizidae article is a stub.