Dadaya macrops

49. Dadaya macrops (Daday, 1898) Localities and specimens found: 50 – 1♀. Distribution and ecology. Dadaya macrops (formerly Alona macrops Daday, 1898) inhabits in the tropics and subtropics around the world (Rajapaksa & Fernando 1982b; Kotov et al. 2013a; Smirnov 1996). It is common in the Oriental region (Fernando 1980; Idris & Fernando 1981; Idris 1983; Michael & Sharma 1988; Sanoamuang 1998; Maiphae et al. 2005, 2008; Tanaka & Ohtaka 2010; Rane 2011; Chatterjee et al. 2013; Korovchinsky 2013; Kotov et al. 2013b; Van Damme et al. 2013; Ji et al. 2015; Sinev & Yusoff 2015, 2018; Lopez et al. 2017; Sharma & Sharma 2017; Gogoi et al. 2018; Tiang-nga et al. 2020; Choedchim & Maiphae 2023) and well known in Vietnam (Shirota 1966; Dang et al. 1980, 2002; Dang & Ho 2001; Sinev & Korovchinsky 2013; Sinev & Semenyuk 2021). The lifestyle and ecology of D. macrops are not completely understood. There are few detailed descriptions of its habitats. It is considered that the species is hyponeustonic, adapted to life under the surface layer of water (Fryer 1956; Rajapaksa & Fernando 1982b; Smirnov 1996). Probably, this crustacean is mainly associated with shallow, stagnant water bodies with abundant vegetation (rice fields, ponds, lakes, floodplains, swamps, etc.) although it is found in other types of water bodies too (Idris & Fernando 1981; Idris 1983; Sanoamuang 1998; Sinev & Korovchinsky 2013; Sinev & Yusoff 2015; Gogoi et al. 2018; Choedchim & Maiphae 2023). Our only female was encountered in a floodplain lake in the rhizosphere of water hyacinth (see Appendix 1). Remarks. Today, D. macrops is the only representative of the genus. Van Damme et al. (2010, 2013) noted that more than one species may be present in the tropics, and this chydorid still needs to be revised.