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A new species of halictine bee (Apoidea: Anthophila: Halictidae) is described and figured from laminated mudstones of Early Miocene age from Rubielos de Mora Basin, Teruel, Spain. Halictus petrefactus, new species, is the first bee from these deposits to be formally described. The geological history of the Halictidae and of the bees as a whole is briefly reviewed.