Cells bearing two flagella that insert anterio-laterally. One flagellum attaching to the substrate or lorica either directly or indirectly (via a thread of mucus) to the substrate. Anterior flagellum creates currents of water from which particles are ingested at a discrete ingestion area. Freshwater and marine. Three genera in two families: Bicosoecidae for the loricate taxa and the Cafeteriidae for the aloricate taxa.