Tyrannochthonius cavernicola is a species of pseudoscorpion in the Chthoniidae family.

[1][2] The male holotype has a body length of 2.5 mm.

Eyes and eye-pigment are completely lacking.

[1] The species occurs only on Lord Howe Island, an offshore island of New South Wales in the Tasman Sea.

The type locality is the totally dark zone of a cave at North Bay (Station 3).