Order THAUMATOMONADIDA Shirkina, 1987
Heterotrophic, cells usually gliding that may swim also; body flattened and with two heterodynamic cilia inserting subapically and/or ventrally; some unikont; with extrusomes; filopodia produced subapically or from ventral groove; cysts; multinucleate and multiciliate stages known.
SEM image of a thaumatomonad – courtesy of © eye of science (www.eyeofscience.com)