Tyrannochthonius 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 habitat The species occurs in south-eastern Queensland, where it inhabits plant litter in closed forest habitats. The type locality is Mount Nebo.
Behaviour The arachnids are terrestrial predators.
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