Life (root) » Animalia (Animals) » Arthropoda (Arthropods) » Hexapoda (Hexapods) » Insecta (Insects) » Pterygota » Hymenoptera (Ants, Bees, Wasps and Sawflies) » Apocrita (Wasps, Bees, and Ants) » Aculeata (Ants, Bees and Stinging Wasps) » Apoidea (Bees and Sphecidae) » Anthophila (Bees) » Megachilidae (Leafcutter, Mason, and Resin Bees, and allies) » Megachilinae » Osmiini » Osmia (Mason Bees) » Cephalosmia