The euglenoids are a group of single-celled protozoans shaped like cigars with a gullet at the front and a single, forward-pointing flagellum. Most live in fresh water, and these contain chloroplasts for photosynthesis. Others live as parasites, often in the guts of animals. The euglenoids and the kinetoplastids, such as the blood parasite Trypanosoma, are now considered to constitute the kingdom Euglenozoa.