Xenosaurus rectocollaris, sometimes known as the pallid knob-scaled lizard, is a species of viviparous lizard. It is endemic to Mexico where it is known from the Sierra Madre de Oaxaca of Oaxaca and Puebla states. It is a rare species occurring in rock crevices in pristine semi-arid areas. References Xenosauridae Endemic reptiles of Mexico Fauna of the Sierra Madre de Oaxaca Reptiles described in 1993 Taxa named by Hobart Muir Smith