Homalopsidae

Köhler, Gunther, Khaing, Khin Pa Pa, Than, Ni Lar, Baranski, Damian, Schell, Tilman, Greve, Carola, Janke, Axel & Pauls, Steffen U., 2021, A new genus and species of mud snake from Myanmar (Reptilia, Squamata Homalopsidae), Zootaxa 4915 (3), pp. 301-325 : 311-312

Key to species of mud snakes (family Homalopsidae ) known to occur in Myanmar

1 Dorsal scales at midbody in more than 30 rows.............................................................. 2

– Dorsal scales at midbody in fewer than 30 rows............................................................. 3

2a Nasals separated from each other............................................................ Bitia hydroides

2b Nasals in contact with each other...................................................... Homalopsis semizonata

3a Nasals separated from each other........................................................................ 4

– Nasals in contact with each other........................................................................ 6

4a Dorsal scales at midbody in 23–27 rows.................................................. .. Fordonia leucobalia

– Dorsal scales at midbody in 17 or 19 rows .................................................................. 5

5a Dorsal scales at midbody in 17 rows...................................................... Gerarda prevostiana

– Dorsal scales at midbody in 19 rows........................................................ Cantoria violacea

6a Dorsal scales keeled.................................................................... Cerberus rynchops

– Dorsal scales smooth.................................................................................. 7

7a Dorsal scales at midbody in 19–21 rows................................................................... 8

– Dorsal scales at midbody in 25–29 rows.................................................................. 10

8a Dorsal scales at midbody in 19 rows..................................................... Hypsiscopus plumbea

– Dorsal scales at midbody in 21 rows...................................................................... 9

9a Subcaudal scales>50; long-tailed, ratio tail length / SVL> 0.21 in males,> 0.18 in females............ Enhydris enhydris

– Subcaudal scales <40; short-tailed, ratio tail length / SVL <0.21 in males, <0.18 in females.......................................................................................... Myanophis thanlyinensis gen. nov. , sp. nov.

10a Dorsal scales at midbody in 29 rows......................................................... Ferania sieboldii

– Dorsal scales at midbody in 25 rows..................................................................... 11

11a Dorsal scales on neck in 25 rows; scales of first three dorsal scale rows oval; a central spot on each ventral scale; no stripe on first dorsal scale row .................................................................... Gyiophis maculosa

– Dorsal scales on neck in more than 25 rows; scales of first three dorsal scale rows squarish; no central spot on each ventral scale; stripe on first dorsal scale row present.................................................................... 12

12a Dorsal scales at posterior body in 20 rows; 129 ventrals in single known female; 30/29 subcaudals in single known female; 4 rows of spots on dorsum; rostral scale narrow............................................ Gyiophis salweenensis

– Dorsal scales at posterior body in 21–23 rows; 142–148 ventrals in females; 41–58 subcaudals in females; 3 rows of spots on dorsum; rostral scale broad................................................................. Gyiophis vorisi