Comparative characters of the head shape and body coloration of Calamaria arcana sp. nov., C. andersoni, C. septentrionalis, C. pavimentata. A–C dorsal view of head and body, and dorsolateral view of body of C. pavimentata (KFBG 14507). D–F dorsal view of head and body, and dorsolateral view of body of C. septentrionalis (KFBG 14506). G–I dorsal view of head and body, and dorsolateral view of body of holotype of C. arcana sp. nov. (KFBG 14611). J–L dorsal view of head and body, and dorsolateral view of body of C. andersoni (SYS r001699).

 
 
  Part of: Yeung HY, Lau MWN, Yang J-H (2022) A new species of Calamaria (Squamata: Colubridae) from Guangdong Province, southern China. Vertebrate Zoology 72: 433-444. https://doi.org/10.3897/vz.72.e84516