ИСТИНА

In recent years a strong progress was achieved in the taxonomy of family Chydoridae (Crustacea: Cladocera). However delineation between some chydorid genera is rather intuitive than based on a careful diagnosing.Disparalona Fryer, 1968 is an example of such genus with confused taxonomy. Our study is dealing with a revision of the North American, African and East Asian populations of D. cf. hamata with aim to clarify their species and generic status. We redescribed D. hamata (Birge, 1879) and D. chappuisi (Brehm, 1931) based on material from type localities. According to our observations, distribution range of D. hamata is restricted by tropical-subtropical regions of the New World, while D. chappuisi is common in the OldWorld tropics and reaches Far East of Russia. In Africa one more unrevised yet Disparalona species was marked. This taxon similar to D. striatoides (Šrámek-Hušek, 1946), but further comparison is need for a final conclusion on its status. After careful comparison of Disparalona with close chydorid genera, we came to the conclusion, that at the current level of knowledge Mixopleuroxus Hudec, 2010 must be accepted as a subgenus of the genus Disparalona. We provided the diagnoses of Disparalona s.str. and D. (Mixopleuroxus). As the result, investigated by us D. hamata, D. chappuisi and D. cf. striatoides were transferred to D. (Mixopleuroxus), while D. ikarus Kotov and Sinev, 2011, D. leei (Chien Shing-ming, 1970), D. rostrata (Koch, 1841), D. smirnovi Sinev, 2015 are kept in Disparalona s. str.