Osmia (Helicosmia) signata Erichson, 1835

Oligolectic on Asteraceae; pollen hosts include members of the Carduoideae, the Cichorioideae and rarely the Asteroideae as well (A. Müller, unpublished, based on 54 pollen samples from 38 different localities and on field observations).

Mavromoustakis (1948) reports visitation to Cirsium syriacum (Asteraceae) in Cyprus

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