Oxyurella singalensis

38. Oxyurella singalensis (Daday, 1898) Localities and specimens found: 50 – 2♀, 1♀ ov, 3j; 51 – 3♀, 1♀ ov, 1♀ em, 1j. Distribution and ecology. Oxyurella singalensis is distributed in the Afrotropical, Oriental and Australian biogeographic regions (Kotov et al. 2013a; Sinev 2017; Lopez et al. 2017). This is one of the most common Oriental species of chydorids (Idris 1983; Michael & Sharma 1988; Sanoamuang 1998; Maiphae et al. 2005, 2008; Tanaka & Ohtaka 2010; Chatterjee et al. 2013; Korovchinsky 2013; Kotov et al. 2013b; Pascual et al. 2014; Ji et al. 2015; Sinev & Yusoff 2015, 2018; Sinev et al. 2015; Sinev 2016; Lopez et al. 2017; Sharma & Sharma 2017; Tiang-nga et al. 2020; Choedchim & Maiphae 2023). It is also well known and widespread in Vietnam (Dang et al. 1980, 2002; Dang & Ho 2001; Sinev & Korovchinsky 2013). Oxyurella singalensis is a littoral species associated with vegetation. It dwells in bottom sediments and among aquatic vegetation in a wide variety of water bodies, primarily in stagnant ones, but it is also found in moderately flowing habitats (Idris 1983; Sanoamuang 1998; Dang & Ho 2001; Pascual et al. 2014; Sinev et al. 2015; Sinev 2016; Lopez et al. 2017; Choedchim & Maiphae 2023). In our material, the species was rare and was detected only in the rhizosphere of floating plants (see Appendix 1).