Rugulopteryx okamurae is a species of brown algae native to the temperate areas of the Northwest Pacific Ocean that has become invasive in the Mediterranean and Northeast Atlantic.
In its natural habitat it lives at depths of between 0.5 and 5 meters, occasionally reaching 15 meters in very transparent waters. The specific epipet pays homage to the Japanese botanist Kintaro Okamura (1867-1945).