Synsphyronus niger is a species of pseudoscorpion in the Garypidae family. It is endemic to Australia. It was described in 1947 by American arachnologist Clarence Clayton Hoff.
Description The body length of the holotype male is 3.6 mm. The colour is mainly brown.
Distribution and habitat The species occurs in south-eastern Australia in woodland habitats. The type locality is Adelaide.
Behaviour The pseudoscorpions are terrestrial predators.
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