The
Euglenozoa are a large group of
flagellate protozoa. They include a variety of common free-living species, as well as a few important parasites, some of which infect humans. There are two main subgroups, the
euglenids and
kinetoplastids. Euglenozoa are unicellular, mostly around
15-40 µm in size, although some euglenids get up to 500 µm long.