Anatemnus subvastus is a species of pseudoscorpion in the Atemnidae family.

It was described in 2014 by Australian arachnologists Jason Alexander, Mieke Burger and Mark Harvey.

The specific epithet subvastus, from Latin: sub ('under') and vastus ('waste' or 'desert'), refers to the species’ underground habitat in the semi-arid Pilbara.

[1] The species occurs in the Hamersley Range of the central Pilbara region of North West Australia.

The type locality is Blackjack, 75 km north-north-west of Tom Price, where the pseudoscorpions were found in subterranean habitats.