Psectrocladius (Psectrocladius) oligosetus Wuelker 1956

Psectrocladius (Psectrocladius) oligosetus Wuelker, 1956 Material examined. • 26 pupal exuviae, Taul Hardau (R 3), 6 July 2023; 59 pupal exuviae, Taul Muced (R 12), 7 July 2023 • 1 pupal exuviae, Lake Gargalau 1 (R 7), 6 July 2023. Distribution. Palaearctic. Recorded from several European countries ranging from the south (Sicily) to the north (Scandinavia) and from the west (Ireland) to the eastern part of Russia (Ashe and O’Connor 2009). Habitat. Cold-stenothermic species occurring in lakes in mountain regions (e. g., Laville and Vinçon 1986, Bitušík et al. 2007, Boggero 2018), although Rieradevall et al. (2007) found it in intermittent mountain headstreams. The species shows an apparent affinity for low pH humic waters (e. g., Ruse 2002; Bitušík and Svitok 2006; Moller Pillot 2013; Bitušík et al. 2020). Remarks. This finding, along with an earlier record from Ukraine (Bitušík et al. 2020), partially fills the distribution gap of the species extending from the Baltic republics across Poland to the Balkans.