Small flagellates with two flagella: one longer trailing one, which appears to stick to the substrate or microscope slide, and a shorter anterior-pointed one, which can beat quickly. It is easily recognized by the flagella, cell shape, and twitching motion. The flicking or twitching is rapid and characteristic of this species: see the video below.
Bodonids are kinetoplastids, which are relatives of the euglenids. Both kinetoplastids and euglenids are members of a larger grouping called the Euglenozoa. Kinetoplastids have large masses of DNA, organized into a structure called the kinetoplast, within their mitochondria.
Other groups which are flagellated but which are described elsewhere on this website.