Tyrannochthonius garthhumphreysi is a species of pseudoscorpion in the Chthoniidae family. It is endemic to Australia. It was described in 2008 by Australian arachnologists Karen Edward and Mark Harvey.[1]
The species occurs in North West Australia. The type locality is a borehole in limestone karst, 7 km north of the Chevron Texaco camp, on Barrow Island off the Pilbara coast.[1]
The arachnids are cave-dwelling, terrestrial predators.