The research was led by a graduate student, Emma Lavo of the French University of Sorbonne and genetics Miriam Valero of CNRS.
Researchers studied the species of red algae, Gracilaria gracilis, as well as small crustaceans, idoteas, in particular Idotea Balthica.
Previously, algae, which are scientifically neither plant nor animal, were thought to use underwater currents to transfer their reproductive cells from one algae to another.
Since male algae gums do not have sperm-like harnesses, they cannot swim on their own.
But researchers have found that crustaceans are contributing to this process, and when racing plants feed on algae males, G. gracilis, sticky-coated spermazoids stick to animal curls.
When they swim with the female algae, they carry a portion of the sperm into its reproductive organ.
The evidence shows that pollination of plants may have occurred as a result of a process that originated at sea.