David Frey raised the hypothesis of non-cosmopolitanism in Cladocera in a series of his publications (Frey 1982, 1987). Since then, researchers have taken the effort to revise species groups with… Click to show full abstract
David Frey raised the hypothesis of non-cosmopolitanism in Cladocera in a series of his publications (Frey 1982, 1987). Since then, researchers have taken the effort to revise species groups with wide geographic distribution around the world (e.g. Kotov Dumont 2000; Sinev 2015; Van Damme Dumont 2008a; Sinev Elmoor-Loureiro 2009). The polyphyletic nature of the genus Alona Baird, 1843 (Van Damme et al. 2010) has further substantiated the view that cladocerans are non-cosmopolitan, with the creation of many new genera to accommodate the several species groups known within this genus (Van Damme Dumont 2008b; Sinev Kobayashi 2012; Van Damme Dumont 2009; Alonso Sinev 2019).
               
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