👉 The term "Leptoceridae" refers to a family of protozoan parasites that are commonly found in freshwater environments around the world, primarily in the southern hemisphere. They are characterized by their elongated bodies and well-developed structures, including small cells, an internal membrane, and a flagellum that allows them to swim rapidly. These parasites play a crucial role in the distribution of various microorganisms, such as bacteria and fungi, in aquatic environments.