Synsphyronus hadronennus

Synsphyronus hadronennus is a species of pseudoscorpion in the Garypidae family. It is endemic to Australia. It was described in 1987 by Australian arachnologist Mark Harvey. The specific epithet hadronennus comes from the Greek hadros ('stout' or 'well-developed') and nennos ('uncle'), referring to the species’ apparently close relationship with its smaller relatives, S. paradoxus and S. heptatrichus.

Description
The body length of males is 2.6–2.9 mm; that of females is 3.3–3.6 mm. Colouration is dark reddish-brown.

Distribution and habitat
The species occurs in the Top End of the Northern Territory. The type locality is 6 km west of South Alligator, where the holotype was found beneath the bark of a eucalypt.

Behaviour
The pseudoscorpions are terrestrial predators.