Tyrannochthonius butleri

Tyrannochthonius butleri is a species of pseudoscorpion in the Chthoniidae family. It is endemic to Australia. It was described in 1991 by Australian arachnologist Mark Harvey. The specific epithet butleri honours naturalist Harry Butler (1930–2015), who provided funding for fieldwork in the Cape Range.

Description
The species lacks eyes. The body length of the male is 1.07 mm; that of the female is 1.22 mm. The colour is very pale yellow.

Distribution and habitat
The species occurs in the Cape Range of North West Australia. The type locality is Cave C-167, where the holotype male was found beneath a rock in the dark zone.

Behaviour
The arachnids are cave-dwelling, terrestrial predators.