Key to the species of Lygosoma in mainland Southeast Asia 1 Supranasals separated from each other................................................................... 2 - Supranasals in contact medially.......................................................................... 5 2 Supranasals partly or completely fused with nasals........................................................... 3 - Supranasals not fused with nasals; midbody scales in 22 rows; fontoparietals paired; supralabials five.................................................................................................... L. veunsaiensis sp. nov. 3 Supranasals completely fused with nasals; frontoparietal single; midbody scales in 24–28 rows; paravertebral scales 109–116.......................................................................................... L. quadrupes - Supranasals and nasals only fused anterior to nostrils......................................................... 4 4 Paravertebral scales 88–98; dark transverse band present between the ears............................. L. isodactylum - Paravertebral scales 63; head without such transverse band........................................... L. koratense 5 Deep groove from below the eye to nostril present; midbody scales in 38–40 rows........................ L. bampfyldei - Deep groove from below the eye to nostril absent........................................................... 6 6 Lower eyelid scaly.................................................................................... 9 - Lower eyelid with an undivided transparent disc............................................................. 7 7 Midbody scales in 22 rows; subdigital lamellae on fourth toe 6–9...................................... L. anguinum - Midbody scales in 24–28 rows........................................................................... 8 8 92–95 paravertebral scales........................................................................ L. popae - 72–76 paravertebral scales...................................................................... L. punctata 9 Frontoparietals paired................................................................................. 13 - Frontoparietal single................................................................................. 10 10 Supralabials nine; body bearing 22–32 dark transverse bands....................................... L. haroldyoungi - Supralabials seven; body without dark transverse bands..................................................... 11 11 Midbody scales in more than 28 rows..................................................................... 12 - Midbody scales in 22 rows; subdigital lamellae on fourth toe 8–10.................................... L. lineolatum 12 Paravertebral scales 56–60; lamellae on fourth toe 13............................................ L. frontoparietale - Paravertebral scales 107–115; lamellae on fourth toe six or seven......................................... L. angeli 13 Midbody scales in 26–32 rows......................................................................... 14 - Midbody scales in 36–40 rows; paravertebral scales 78–86; 11–15 lamellae on fourth toe................ L. corpulentum 14 Paravertebral scales 55–59............................................................................. 16 - Paravertebral scales 63–72............................................................................. 15 15 Midbody scales in 26–28 rows; each scale bearing a black spot; flanks with white spots.................. L. albopunctata - Midbody scales in 32 rows; paravertebral scales 66; dorsum and flanks uniformly brown.................... L. boehmei 16 Scales carinated; lamellae on fourth toe 14.......................................................... L. herberti - Scales smooth; lamellae on fourth toe 12–13...................................................... L. bowringii

Published as part of Geissler, Peter, Hartmann, Timo & Neang, Thy, 2012, A new species of the genus Lygosoma Hardwicke & Gray, 1827 (Squamata: Scincidae) from northeastern Cambodia, with an updated identification key to the genus Lygosoma in mainland Southeast Asia, pp. 56-68 in Zootaxa 3190 on pages 65-66, DOI: 10.5281/zenodo.280057