test free, monothalamous, ovoid shape (ratio length/width between 1 and 2), < 115um in length and < 85 um in width; organic wall transparent from 1 to 3 um in width. Two opposite apertures, funnel-shaped with a tubular internal extension. Cytoplasm multinucleate at least in this stage of its life cycle; granular, with rapid movement. Reticulopodes very active with rapidly forming large reticulopodial network and fast moving granules.