Sampling localities of the current study and type localities of the Ptyctolaemus species. See Table 1 for sampling locality (1–31) details. Type localities are indicated by stars and other localities are indicated with a circle. Green circles: Ptyctolaemus gularis; purple star and circle: Ptyctolaemus siangensis sp. nov.; blue star and circle: Ptyctolaemus namdaphaensis sp. nov.; yellow star: Ptyctolaemus collicristatus; pink star: Ptyctolaemus chindwinensis.