Tyrannochthonius semihorridusTyrannochthonius semihorridus is a species of pseudoscorpion in the Chthoniidae family. It is endemic to Australia. It was described in 1969 by Austrian arachnologist Max Beier.Distribution and habitatThe species occurs in south-eastern Queensland, where it inhabits plant litter in closed forest habitats. The type locality is Mount Nebo.BehaviourThe arachnids are terrestrial predators.