So far I could detect Histiona aroides only once in July 2021 in the Simmelried. I found colonies of 10 – 20 specimens each on algae filaments. The lorica of Histiona aroides has a campanulate shape, with a bulbous extension at the level of the cell. The flagellate in the lorica forms a sail-shaped cytoplasmic lip. Two flagella of different length arise from the base of this lip. The long flagellum swirls food (bacteria) in a whip-like manner. The function of the cytoplasmic lip seems to that of a funnel or the swirled bacteria stick to it and are then stripped off by the second, short flagellum. The short flagellum is difficult to see. It is supposed to be adjacent to the plasma lip. However, I could also observe that it moving over the plasma lip (s. fig. 3a-c).