Icus angularis Fieber, 1861a: 173. ST(S): female, Italy, Sicily: lost?
Megalonotus marginatus Jakovlev, 1873: 36 (syn. Jakovlev, 1875: 158). LT (Péricart, 1998b: 125): female, Russia (ST), Astrakhan; ZMAS.
Megalonotus hungaricus Horváth, 1874b: 455 (syn. Horváth, 1875b: 52). LT (Scudder, 1970a: 201): female, Hungary, Buda; HNHM.
Icus angularis var. corsicus Puton, 1878c: 43. LT (Scudder, 1967b: 153): male, France, Corsica; MNHN.