Grozeva et al., 2007 (chromosomes, tax.); Martinez-Cascales et al., 2006 (tax.); V.G. Putshkov, 1978d (nubilus and insignis); Tamanini, 1981 (nubilus); Tsybul'skaya & Kryzhanovskaya, 1980 (nubilus, biol.); Wagner, 1951d (nubilus).
Distribution
Eyles et al., 2008 (New Zealand); Flynn et al., 2010 (New Zealand); Protić, 2011c (Serbia); Aukema et al., 2013 (Canary Islands: La Palma); Heckmann et al., 2015 (Crete); Konstantinov & Zinovyeva, 2017 (Russia: ST).