Copulatory apparatuses of the species in the genera Ampullaceana, Peregriana, Kamtschaticana, Tibetoradix, Racesina, Orientogalba and Bullastra. A. Ampullaceana ampla (11.07.2017, Ukraine, Transcarpathian Region, Irshava River). B. A. balthica (Germany, Mecklenburg-Vorpommern, lake Torgelower See). C. A. dipkunensis (15.09.2016, Ukraine, Transcarpathian Region, Tisa River). D. A. fontinalis (20.08.2017, Russia, Rostov Region, Severskiy Donets River). E. A. lagotis (29.06.2016, Tajikistan, a stream in the Panj River floodplain). F. Peregriana dolgini (13.07.2015, Russia, Tyumen’ Region, a floodplain of the Tol’ka oxbow). G. Peregriana peregra (01.07.2006, Russia, Omsk Region, vicinity of Chernoluchye settlement). H. Kamtschaticana kamtschatica (12.04.2014, Russia, Kamchatka Peninsula, Valley of Geysers). I. Tibetoradix hookeri (09-10.2012, China, Tibet, a brook, 250 km N of Lhasa). J. T. kozlovi (after Aksyonova et al. 2018a, modified). K. Racesina oxiana (04.07.2016, Tajikistan, a roadside ditch near Kurban-Shakhid village). L. R. siamensis (24.11.2016, Myanmar, a water reservoir on the Yetho River). M. Ampullaceana relicta relicta (2005, Ohrid Lake). N. Orientogalba ollula (08.07.2010, China, Shaanxi Province, a roadside ditch near Yandi village). O. Bullastra cumingiana (Philippines, Luzon Island, Lake Sampaloc). Scale bars: 1 mm. B – after Schniebs et al. (2011), modified.