Chérot et al., 2020 (biology, chorology); Jordan, 1941; Kerzhner, 1974a; Linnavuori, 1951a, 1958; Melber & Köhler, 1992 (biol., morph.); Štys, 1959a (nymph), 1990 (biol.). Distribution: Protić, 1998a (Bosnia Hervegovina); Josifov & Simov, 2004 (Bulgaria); Lukashuk, 1997 (Byelorussia); Spuņģis, 2009 (Latvia); Reichling & Gerend, 1994 (Luxembourg); Golub & Vinokurov, 2009 (RU: WS); Frey et al., 2016 (Switzerland).