Description published
Linnaeus, Systema Naturae, 10th edn, vol. 1, p. 575.
Location of type
Type material: Holotype f, “in Europa” [Sweden], LSUK (London). Type species of Osmia Panzer.-Combination Osmia (Ceratosmia) bicornis (Linnaeus) in Schmiedeknecht (1885: 19 [885]).-Synonymy with Osmia rufa (Linnaeus) in Dalla Torre (1896: 407) and in Warncke (1986: 121), but see Day (1979: 51, 70).