Catalogue of distribution of lizards (Reptilia: Squamata) from the Brazilian Amazonia. IV. Alopoglossidae, Gymnophthalmidae Ribeiro-Júnior, Marco A. Amaral, Silvana Zootaxa 2017 4269 2 151 196 Vanzolini & Carvalho, 1991 Vanzolini & Carvalho 1991 [151,879,1228,1254] Reptilia Gymnophthalmidae Gymnophthalmus Animalia Squamata 17 168 Chordata species leucomystax   Pertinent taxonomic references.Vanzolini & Carvalho (1991), Cole et al.(1993), Ávila-Pires (1995), Yonenaga-Yassuda et al.(1995), Carvalho (1997), Kizirian & Cole (1999), Pellegrino et al.(2001), Benozzati & Rodrigues (2003), Castoe et al.(2004), Goicoechea et al. (2016).   Distribution and habitat.  Gymnophthalmus leucomystaxis endemic to northern Amazonia, typical of the Lavrado area of the Guianaregion, occurring in Braziland Guyana( Fig. 9). In Brazil, it is only known from the state of Roraima.  Gymnophthalmus leucomystaxis sexually dimorphic, terrestrial, and diurnal, inhabits open vegetation areas (savannas), where it is found in termite nests (Vitt & Carvalho 1995) and at the edge of rock outcrops (Vitt et al.1996). 1503410409 [151,751,1298,1323] Brazil Roraima 17 168 1 Roraima