Lacewings of Vietnam: new species and distributional records of Osmylidae and Sisyridae (Neuroptera: Osmyloidea)

Despite ongoing taxonomic efforts, species diversity and geographic distributions remain poorly documented for many groups of Osmyloidea, including in parts of Asia. In this study, we contribute to the taxonomic knowledge of Osmyloidea, the sole group of lacewings (Insecta: Neuroptera) with both freshwater and terrestrial representatives, while also reducing distributional gaps for the group. We conducted detailed examination of lacewing specimens from Vietnam from worldwide entomological museums. We described two new species of Osmylidae, Osmylus hagiangensis sp. nov. and Thaumatosmylus solitarius sp. nov. This is the first record of the genera Osmylus Latreille and Thaumatosmylus Krüger from Vietnam, totalling new records of four species of Osmylidae. We also provide the first record of three species of Sisyridae in the country Sisyra nikkoana (Navás), S. nobilia Yang, Zheng & Liu and Sisyrina qiong Yang & Gao. Previous studies recorded only five species and four genera in Vietnam, and our research nearly doubles this diversity: 12 species in six different genera.

Keywords:
Identification guide; Lance lacewings; Neuropterida; Oriental region; Spongillaflies