Synsphyronus niger is a species of pseudoscorpion in the Garypidae family.

It was described in 1947 by American arachnologist Clarence Clayton Hoff.

[1][2] The body length of the holotype male is 3.6 mm.

[1] The species occurs in south-eastern Australia in woodland habitats.

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