Magnien, 2000b (figs, genitalia, tax.); Rieger, 1983; Wagner, 1941e, 1955i (teratol.); Wyniger, 2006a (male genitalia); Wyniger, 2006b (figs, female genitalia).
Distribution: J. Ribes & E. Ribes, 2002b (Andorra); Kerzhner, 2004 (Russia NT); Coulianos, 2005 (no records from Estonia).