4. Stylaria lacustris (Linnaeus, 1767)

Stylaria lacustris (Linnaeus) . Chen 1959: 23; Liang 1962: 20. Stylaria proboscidea (Müller) . Chen 1940: 44–46.

Material. Lhasa River: ST9, 11 spms; Niyang River: ST29, 2 spms; ST31, 4 spms; ST32, 15 spms. Lalu Wetland: ST61, 22 spms.

Remarks. First record from Tibet; recorded in areas of northern China, such as Helongjiang, Xinjiang, and Guizhou (Wang & Cui 2007; Mezzanotte 2008). This species is widely distributed in Europe, west Asia and North America (Brinkhurst & Jamieson 1971; Wetzel et al. 2006).