Osmia bidentata, Morawitz, 1876

Müller, Andreas, 2018, Palaearctic Osmia bees of the subgenus Hoplosmia (Megachilidae, Osmiini): biology, taxonomy and key to species, Zootaxa 4415 (2), pp. 297-329 : 311

Osmia bidentata species group

The members of this species group are characterized by the shape and punctation of the female clypeus and the nest building material. In contrast to the other O. ( Hoplosmia ) species, the clypeus lacks an impunctate apical margin, it is apically bent rather than flattened and its punctation is apically composed of both small and large punctures rather than of uniformly fine punctures. Brood cell partitions and nest plug are constructed from mud, whereas all the other O. ( Hoplosmia ) species use leaf pulp as nest building material.