Description of Pirsonia mucosa
provided by BioPedia
Flagellates 12-14 microns long, 5-7 microns wide. Anterior flagellum 10-12 microns, posterior flagellum 26-32 microns long. Flagella inset in a median position and are relatively stiff. Movement is mainly a slow gliding rather than swimming. Flagellates attach themselves with their lateral side or even subapically. Generally only one auxosome, up to 18 microns in diameter. It remains connected to the trophosome. Division pattern variable, resulting in a morula-shaped accumulation of frequently not more than 4 flagellate mother cells, surrounded by a common mucilaginous envelope.