Notoalona globulosa globulosa (Daday, 1898)

36. Notoalona globulosa globulosa (Daday, 1898) View in CoL

Localities and specimens found: 50 – 12♀, 11♀ ov, 11♀ em, 8j; 51 – 3♀.

Distribution and ecology. Notoalona globulosa s. lat. is a very small chydorid with a morphological variability not yet fully studied and an intricate taxonomic history ( Rajapaksa & Fernando 1987a; Van Damme et al. 2010, 2013; Neretina et al. 2017, 2019). According to the latest views, this crustacean is distributed in tropical Asia and Australia (Neretina et al. 2017, 2019). In Asia, the taxon is evidently represented by the subspecies N. globulosa globulosa ( Rajapaksa & Fernando 1987a; Van Damme et al. 2013; Sinev 2016), although this issue requires further research (see Remarks below) ( Neretina et al. 2019). Notoalona globulosa is documented in almost the entire Oriental area ( Sanoamuang 1998; Maiphae et al. 2005, 2008; Tanaka & Ohtaka 2010; Rane 2011; Chatterjee et al. 2013; Korovchinsky 2013; Kotov et al. 2013b; Ji et al. 2015; Padhye & Dumont 2015; Sinev & Yusoff 2015, 2018; Sinev et al. 2015; Lopez et al. 2017; Sharma & Hatimuria 2017; Sharma & Sharma 2017; Yatigammana & Cumming 2017; Tiang-nga et al. 2020; Choedchim & Maiphae 2023) and from many sources it was also indicated in the region under various synonymous names, primarily as Alona globulosa Daday, 1898 , Indialona globulosa (Daday, 1898) or Alonella globulosa (Daday, 1898) ( Chiang & Du 1979; Fernando 1980; Rajapaksa & Fernando 1982a, 1987a; Idris & Fernando 1981; Idris 1983; Michael & Sharma 1988; Chatterjee et al. 2013; Korovchinsky 2013; Ji et al. 2015). In Vietnam, the finds of Notoalona globulosa are rare. So far, it has been registered only in the southern part of the country ( Sinev & Korovchinsky 2013; present study). Alonella globulosa and Indialona globulosa insulcata (Stingelin, 1905) (= Alonella sculpta var. insulcata Stingelin, 1904 ), reported for South Vietnam by Shirota (1966) and Smirnov (1971) respectively, should probably also be attributed to Notoalona globulosa ( Rajapaksa & Fernando 1987a) .

Notoalona globulosa most likely belongs to the littoral species associated with aquatic vegetation (Sinev 2016; Neretina et al. 2019). It is recorded in a wide variety of water bodies: lakes and ponds of different types, reservoirs, swamps, rice fields, ditches, channels, rivers ( Idris & Fernando 1981; Sanoamuang 1998; Sinev & Korovchinsky 2013; Padhye & Dumont 2015; Sinev & Yusoff 2015; Sinev 2016; Yatigammana & Cumming 2017; Gogoi et al. 2018; Choedchim & Maiphae 2023). Rajapaksa & Fernando (1982a) classified this crustacean as eurytopic. At the same time, according to Neretina et al. (2019), its ecology still needs to be clarified. We found N. globulosa only in samples from the rhizosphere of floating plants (see Appendix 1).

Remarks. As recent reviews show, the morphology, distribution and ecology of representatives of Notoalona , and in particular N. globulosa , still need additional research (Van Damme et al. 2013; Neretina et al. 2017, 2019). The species N. globulosa was repeatedly transferred from genus to genus and was indicated in the literature under various names (species, subspecies, morphological forms), as can be seen from its rich synonymy ( Smirnov 1971; Rajapaksa & Fernando 1987a; Van Damme et al. 2010, 2013; Neretina et al. 2017, 2019). The specimens we found in Vietnam correspond in external morphology to the subspecies N. globulosa globulosa according to the main characteristics ( Rajapaksa & Fernando 1987a; Van Damme et al. 2013; Sinev 2016). Therefore, for now, we present them in this checklist as follows. Meanwhile, Neretina et al. (2019) doubted the convenience of distinguishing two subspecies of N. globulosa — Asian N. globulosa globulosa and Australian N. globulosa australiensis Rajapaksa et Fernando, 1987 —and pointed out the need for additional research on these populations, including the use of genetic methods.