Pseudotyrannochthonius giganteus

Pseudotyrannochthonius giganteus is a species of pseudoscorpion in the Pseudotyrannochthoniidae family. It is endemic to Australia. It was described in 1971 by Austrian arachnologist Max Beier.

Description
The body length of the female holotype is 3 mm; that of the paratype males is 2.2–2.5 mm.

Distribution and habitat
The species occurs in south-west Western Australia. The type locality is Calgardup Cave, near Augusta in the Leeuwin-Naturaliste National Park. The type specimens were collected from the final chamber on roots hanging from the cave ceiling.

Behaviour
The pseudoscorpions are cave-dwelling, terrestrial predators.