Bodonids, which are common in freshwater enviroments, and also the trypanosomes. The most well known trypanosomes are those that belong to the genus Trypanosoma. They cause diseases in humans such as sleeping sickness and Chagas' disease. Trypanosomes, a serious public health problem, are transmitted by biting flies. Studies have shown that kinetoplastids are probably related to the euglenids as well as amoeboflagellates .
Euglenids are elongated cells that use one or two flagella for movement.
There are nearly one thousand species of euglenids. Some are photosynthetic and have chloroplasts, while others do not have chloroplasts and are colorless. Most euglenids live in shallow freshwater enviroments that have been enriched by decaying organic matter, but some euglenids live in marine waters, and a few others are parasitic. Amoeboflagellates, also known as Schizopyrenida, are small, colorless protists. Most amoeboflagellates are able to transform between amoeboid forms and flagellate forms.