Alonella excisa

40. Alonella cf. excisa (Fischer, 1854) Localities and specimens found: 50 – 3♀, 1♀ ov, 1j; 51 – 11♀, 1♀ ov, 2♀ em, 2j. Distribution and ecology. Alonella excisa s. lat. is one of the most known members of the genus distributed almost worldwide (Smirnov 1996; Kotov et al. 2013a; Korovchinsky et al. 2021b).This taxon is evidently represented by a complex of related species that require further investigation, including in the Asian region (Smirnov 1996; Kotov et al. 2013b; Neretina et al. 2021). In the Oriental area, A. excisa -like individuals are noted relatively often (Chiang & Du 1979; Idris & Fernando 1981; Idris 1983; Michael & Sharma 1988; Maiphae et al. 2005, 2008; Tanaka & Ohtaka 2010; Chatterjee et al. 2013; Korovchinsky 2013; Kotov et al. 2013b; Van Damme et al. 2013; Ji et al. 2015; Sinev et al. 2015, 2020; Lopez et al. 2017; Sharma & Sharma 2017; Gogoi et al. 2018; Tiang-nga et al. 2020; Dadykin et al. 2023). In Vietnam, these crustaceans were mainly designated as A. excisa excisa (Fischer, 1854) (Dang et al. 1980, 2002; Dang & Ho 2001; Duong et al. 2008; Sinev & Semenyuk 2021). Alonella excisa s. lat. is an eurybiontic chydorid found in plankton, benthos and among aquatic vegetation of various types of water bodies, in big ones mainly in the littoral zone (Idris 1983; Duong et al. 2008; Lopez et al. 2017; Korovchinsky et al. 2021b). In our material, these crustaceans were encountered only in samples from the root system of floating macrophytes (see Appendix 1).