Malawimonadidae fam. nov.
Free-living heterotrophic nanoflagellate protists with apical insertion of flagella. Flagellate cells uninucleate, mitochondriate. Mitochondria with discoidal cristae. Golgi of few cisternae, adjacent to flagellar insertion. Flagella two, the posteriorly directed flagellum lying in a groove on the ventral surface of the flagellate cell but never physically attached to the cell body. Posterior flagellum bearing a vane originating on the ventral side of the flagellum. Kinetid of interphase cells consisting primarily of two basal bodies and four microtubular roots, with three of the roots originating in the vicinity of the posterior basal bodies and defining the ventral groove. Cysts with a wall formed on the outside of encysting cells and apparently composed of organic materials; kinetid elements preserved in mature cysts. With one genus, Malawimonas.