Bosmina is a genus in the order Cladocera. Its members can be distinguished from those of Bosminopsis (the only other genus in the family Bosminidae) by the separation of the antennae; in Bosminopsis, the antennae are fused at their bases. Bosmina are filter feeders consuming algae and protozoans about 1–3 μm long. Bosmina are known to have a dual feeding mechanism. They can filter the water using their second and third legs and the first leg will grab the particles.