Comparison of head coloration (left profile and dorsal view of the head) between males of A–B Trimeresurus ciliaris sp. nov.; C–D T. kanburiensis; E–F T. kuiburi; and G–H T. venustus s. str. Photographs by P. Pawangkhanant (A–D), A. Kaosung (E–F, H) and M. Naiduangchan (G).

 
 
  Part of: Idiiatullina SS, Pawangkhanant P, Tawan T, Worranuch T, Dechochai B, Suwannapoom C, Nguyen TV, Chanhome L, Poyarkov NA (2023) Limestone jewel: A new colourful karst-dwelling pitviper (Serpentes: Viperidae: Trimeresurus) from the poorly explored borderlands of southern peninsular Thailand. Vertebrate Zoology 73: 697-716. https://doi.org/10.3897/vz.73.e109854