Xenolpium longiventer is a species of pseudoscorpion in the Olpiidae family.

It was described in 1885 by German arachnologists Ludwig Carl Christian Koch and Eugen von Keyserling.

[1][2] The species occurs in Queensland, Tasmania and Victoria.

The type locality is Peak Downs in Queensland's Central Highlands Region.

The pseudoscorpions inhabit plant litter.