 The taxonomic position of certain populations, including some in China, Laos and east Korea, is unclear and require further study.It is possible that all these Chinese populations are part of "O. sinensis", but the Laos specimens are relatively large, similar to "O. latipes" rather than the tiny "O. sinensis".The east Korean population is part of a clade with "O. sakaizumii" and "O. latipes".