Fisculla margaritae (Dumack, Baumann et Bonkowski, 2016)
Diagnosis: Cell body: round, diameter 34–45 µm. Spherical granular nucleus; 14–20 µm. Nucleolus not visible light microscopically. With a thin layer of vacuoles (some hyaline, some filled with refractive granules, possibly lipid droplets) in the apical end of the cell. No floating stages were observed. Cell aggregates usually with 2–4 cells.
Ecology: Type locality: bank of the river Rhine in Cologne, Germany; shallow river sediment; sand and pebbles <3 cm.