In this study, a total of 106 individuals of Oreocryptophis porphyraceus from mainland China were morphologically examined and recorded. Differences between populations were compared by combining data from this study and other published research. The skulls of three specimens representing three proposed subspecies (i.e., O. p. pulchra, O. p. vaillanti, and O. p. hainana) were examined by computed tomography (CT) scanning. Both external morphological characters and skull comparisons consistently showed significant differences between the studied populations. Based on these data, we suggest that at least four subspecies of O. porphyraceus should be recognized in mainland China: i.e., O. p. porphyraceus, O. p. pulchra, O. p. vaillanti, and O. p. hainana. However, the taxonomical arrangement of the central Chinese populations with intermediate morphology remain unresolved.
Keywords: Distribution; Morphology; Skull; Snake; Taxonomy.