Gymnophthalmus leucomystax Vanzolini & Carvalho, 1991

Type-locality. Fazenda Salvamento, Roraima, Brazil.

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 leucomystax is endemic to northern Amazonia, typical of the Lavrado area of the Guiana region, occurring in Brazil and Guyana (Fig. 9). In Brazil, it is only known from the state of Roraima. Gymnophthalmus leucomystax is 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).