Tyrannochthonius semihorridus is a species of pseudoscorpion in the Chthoniidae family.

It was described in 1969 by Austrian arachnologist Max Beier.

[1][2] The species occurs in south-eastern Queensland, where it inhabits plant litter in closed forest habitats.

The type locality is Mount Nebo.

[1][2] The arachnids are terrestrial predators.