Synsphyronus gracilis 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 gracilis (Latin: 'slender') refers to the pseudoscorpionâÂÂs slender appendages.
The body length of the female holotype is 3.9 mm. Colouration is pale yellowish-brown.
The species occurs in the Pilbara region of North West Australia. The type locality is Marillana Station.
The pseudoscorpions are terrestrial predators.