A Phylogenetic Morphometric Investigation of Interspecific Relationships of Lyponia s. str. (Coleoptera, Lycidae) Based on Male Genitalia Shapes

The nominate subgenus Waterhouse, 1878 from China is reviewed, with two new species described and named (s. str.) sp. n. (China, Yunnan) and (s. str.) sp. n. (China, Xizang). A distribution map and a key to all species of s. str. are provided. Moreover, the phenotypic relationships among the species of s. str. are investigated based on phallus shapes using geometric morphometric and phylogenetic morphometric analyses. The topologies demonstrate that the species are divided into two clades. One clade is composed of six species ( sp. n., sp. n., , , , and ) and is supported by a stout phallus (less than 3.6 times longer than wide). The other clade includes the remaining species ( , , , , and ) and is supported by a slender phallus (at least 4.1 times longer than wide). These results provide better understanding of the species diversity and evolution of s. str. Nonetheless, more samples and loci are required in the future to verify the present results.