Velella - Planktonic Vessels
Colonies of polyps transported by prevailing winds, velella drift at the surface of warm seas.

Embryos and larvae
Drifting in the currents, embryos and larvae perpetuate the species and are food for multitudes.

Dinoflagellate Ceratium gravidum. In the video one can observe the movement of one of the two flagella. (Video : Sophie Marro)

Salpes - La vie enchaînée
Bien que d’apparence primitive, les salpes sont de proches ancêtres des poissons. Lorsque les algues abondent, les salpes prolifèrent en de longues chaînes d’individus clonés.

Illustration in synthesized images of the seasons of the ocean: a year from the Antarctic - Animation Clement Fontana

Les Dinoflagellés - Ceratium gravidum
Ceratium gravidum dont en voit parfaitement les mouvements d’un des deux flagelles.

This video describes how to perform the Ludion experiment and explains the physical processes involved.