A new species of Lucañas, 2021 with comments on its subfamilial placement, based on morphological and molecular data.

One new species of Lucañas, 2021 from China is described. We construct a haplotype network from 21 sequences to display the relationships amongst populations of , mainly from Hainan Island, Yunnan Province and Guangxi Province, China. For the first time, we provide the details of female genitalia in addition to the known external morphology and male genitalia of the genus. Six molecular markers (, , , , and ) from a total of 38 samples, including three samples of , are used to reconstruct phylogenetic trees using Maximum Likelihood (ML) and Bayesian Inference (BI) to assess the phylogenetic affinities of . Photographs of the morphology and a key to the three species are also provided.