Diatoms of the genus Eunotia can lie on a flat substrate with four raphe branches. With this " four-wheel drive " they carry out unusual movements.
In the video on the left you can see this movement in time lapse. The image below shows a superposition of images from the video and reveals the movements with their rotations and changes of direction.
Details can be found here: https://diatoms.de/en/example-of-complex-paths
