Some diatoms have the ability to float on the water surface for extended periods of time. Nitzschia sigmoidea exhibit unusual movement patterns on the water surface.
The videos on the left show Nitzschia sigmoidea in darkfield in time-lapse. Depending on the strain, the movement patterns may be more or less pronounced.
Details can be found here: https://diatoms.de/en/observation-of-diatoms/movement-on-the-water-surface
