First description of the female of Clamaria andersoni Yang & Zheng, 2018 (Squamata, Calamariidae), with an expanded diagnosis

Until now, no female specimens had been reported, limiting understanding of sexual dimorphism and diagnostic variation. Based on newly collected material from Mangshi City and Lianghe County, we identified five males and one female as C. andersoni through morphological comparisons and mitochondrial cytochrome b gene analysis.We provide the first morphological description of the female and revise the species diagnosis based on both sexes.

The female is distinguishable by a higher number of ventrals and fewer subcaudals. Genetic data confirmed all specimens as belonging to a well-supported clade of C. andersoni, which is 9.8–10.1% divergent from C. yunnanensis. The known distribution of the species is extended to lower elevations (1,185–1,315 m a.s.l.) within tropical evergreen forests of Dehong.