Lygosoma

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, Zootaxa 3190, pp. 56-68 : 65-66

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