A new species of Arthrosaura is described from Mount Ayanganna, Pakaraima M
ountains, Guyana. It differs from all other Arthrosaura by having four supr
aoculars, broad gulars, femoral and anal pores each within a single scale,
and no abrupt demarcation between the lateral scales and the dorsal or vent
ral scales. The new species is morphologically closest to A. kockii and A.
testigensis.