Chthonioidea

The Chthonioidea are a superfamily of pseudoscorpions, representing the earliest diverging and most primitive living pseudoscorpions. The superfamily contains two families.

Pseudotyrannochthoniidae — worldwide
Chthoniidae — worldwide

Some authors consider the genus Lechytia to be in its own family Lechytiidae, rather than to reside in Chthoniidae.