Dibamus, Dumeril & Bibron, 1839

Kliukin, Nikita S., Nguyen, Tan Van, Pawangkhanant, Parinya, Pham, Hieu Minh, Le, Son Xuan, Gorin, Vladislav A., Bos, Collin, Krone, Isaac W. & Poyarkov, Nikolay A., 2025, A new species of Dibamus from the Central Highlands of Vietnam with redescription of Dibamus montanus Smith, 1921 (Squamata: Dibamidae), Zootaxa 5693 (1), pp. 1-31 : 27

Key to the Dibamus species of Indochina

As a result of the combination of the examined material and literature data, we propose the following identification key to the species of the genus Dibamus of Indochina (including Vietnam, Laos, Cambodia, Thailand, and Peninsular Malaysia) and southern China.

1(4) Lateral rostral sutures present, medial rostral suture absent...................................................... ................................................................................................... 2

2(3) Nasal suture present and complete........................................... D. bourreti (northern Vietnam, China)

3(2) Nasal suture present and incomplete............................................ D. bogadeki ( Hong Kong, China)

4(1) Medial rostral suture present, lateral rostral sutures absent...................................................... 5

5(8) Medial rostral suture present and complete..................................................................6

6(7) 18–19 midbody scale rows................................................... D. somsaki ( Chanthaburi, Thailand)

7(6) 20–22 midbody scale rows............................................. D. montanus (Langbian Plateau, Vietnam)

8(5) Medial rostral suture absent or incomplete................................................................. 9

9(22) One postocular scale on each side....................................................................... 10

10(15) Nasal suture present and complete....................................................................... 11

11(12) 16–17 midbody scale rows, two scales bordering the posteromedial edge of the first infralabial.......................................................................................... D. deharvengi ( Ba Ria-Vung Tau, Vietnam)

12 (11) More than 18 midbody scale rows, three to four scales bordering the posteromedial edge of the first infralabial.......... 13

13(14) 19 midbody scale rows, three scales bordering the posteromedial edge of the first infralabial, in males the length of the limbs is less than the length of the head..................................... D. elephantinus (Damrei Mountains, Cambodia)

14(13) 20 midbody scale rows, four scales bordering the posteromedial edge of the first infralabial, in males the length of the limbs is larger or equal to the length of the head.............................. D. dalaiensis (Cardamom Mountains, Cambodia)

15(10) Nasal suture reduced to absent or incomplete.............................................................. 16

16(17) Labial suture absent, 21 midbody scale rows.......................................... D.floweri ( Pahang, Malaysia)

17(16) Labial suture present, 19–20 midbody scale rows............................................................18

18(19) Two supralabials on each side, tail length is 24–28% of body length, frontal much larger than frontanasal............................................................................................... D.greeri ( Gia Lai, Vietnam)

19(18) One supralabial on each side, tail length is 9–19% of body length.............................................. 20

20(21) 19 midbody scale rows, two scales bordering the posteromedial edge of the first infralabial, more than 14% of body length.................................................................... Dibamus annae sp. nov. ( Gia Lai, Vietnam)

21(20) 20 midbody scale rows, three scales bordering the posteromedial edge of the first infralabial, tail length less than 14% of body length..................................................................... D. booliati ( Kelantan, Malaysia)

22(9) Two or more postocular scales on each side................................................................ 23

23(24) Nasal and labial sutures complete...................................... D. kondaoensis (Con Dao Islands, Vietnam)

24(23) Nasal and labial sutures incomplete or absent.............................................................. 25

25(26) Two scales bordering the posteromedial edge of the first infralabial, 18–19 midbody scale rows, labial suture typically absent..................................................................... D. smithi (Langbian Plateau, Vietnam)

26(25) Three to five scales bordering the posteromedial edge of the first infralabial, 19–25 midbody scale rows, labial suture incomplete......................................................................................... 27

27(28) Medial rostral sutures absent, 41–47 subcaudal scales............................ D. alfredi ( Pattani & Yala, Thailand)

28(27) Medial rostral suture present and incomplete, more than 47 subcaudal scales..................................... 29

29(30) 19–21 midbody scale rows, 64–65 subcaudal scales, tail length more than 24% of body length................................................................................................ D. tropcentr ( Ninh Thuan, Vietnam)

30(29) 22–25 midbody scale rows, 47–55 subcaudal scales, tail length less than 24% of body length................................................................................................. D. deimontis ( Ninh Thuan, Vietnam)