Synthesis about records of the mayfly genus <i>Prosopistoma</i> Latreille, 1833 (Ephemeroptera, Prosopistomatidae) in the European part of Russia

Our study provides new records and a holistic view on distribution and habitats of Prosopistoma pennigerum (Müller, 1785) and P. cf. pennigerum in the European part of Russia. In this region, according to the literature data, P. pennigerum has been reported from Tverskaya Oblast’ and the Republic of North Ossetia-Alania. Between 2006 and 2022 the authors collected about 3390 macrozoobenthos samples from the European part of Russia, and the genus Prosopistoma Latreille, Citation1833 was found in less than 0.5% of the samples, which reflects the scarcity of this mayfly. Herein, we publish first records of P. pennigerum from Smolenskaya Oblast’ (Western Dvina) and of P. cf. pennigerum from Krasnodarskiy Kray and Republic of Adygea based on the material from the Kuban’ River basin. Further, we provide additional records of P. pennigerum from Tverskaya Oblast’ (Volga River). Therefore, at present in the European part of Russia, the genus Prosopistoma is known from catchments of the Caspian Sea (Volga, Terek), the Baltic Sea (Western Dvina) and the Azov Sea (Kuban’). The problems of species identification of the material collected in Southern Russia are briefly discussed.