Phylum: ArthropodaSubphylum: HexapodaClass: Insecta (insects, Insekten)Subclass: PterygotaOrder: Hymenoptera (Hautflgler)Suborder: Apocritra (Taillenwespen)Superfamily: Apoidea (Bienen und Grabwespen)Family: Megachilidae (mason bees & leafcutter bees)Subfamily: Megachilinae (Bauchsammlerbienen)Genus: Osmia PANZER, 1806 (Mason bees, Mauerbienen)[confirmed by "bleu.geo", 2012, based on this photo]either O. rufa or O. cornuta[det. "bleu.geo", 2012, based on this photo]more info: en.wikipedia.org/wiki/Mason_beeSE-Germany, Bavaria, vic. Regensburg: Adelmannstein, 20.05.2012IMG_0682