Rheosaurus sulcarostrum is a species of lizard in the family Gymnophthalmidae.

[3] It is monotypic in the genus Rheosaurus.

R. sulcarostrum is found in leaf litter on the floor of high-canopy rainforest.

R. sulcarostrum has been found in northwestern Guyana at low elevation.

This lizard from family Gymnophthalmidae article is a stub.