Wikipedia
Pseudoplanktonic organisms are those that attach themselves to planktonic organisms or other floating objects, such as drifting wood, buoyant shells of organisms such as Spirula, or man-made flotsam. Examples include goose barnacles and the bryozoan Jellyella. By themselves these animals cannot float, which contrasts them with true planktonic organisms such as Velella and the Portuguese Man o' War, which are buoyant.
Usage examples of "pseudoplankton".
I was a girl, and they never worked rightsooner or later the pseudoplankton got into the cleaning machines, same as it got into everything else anywhere near water, and screwed them up.
Sunlight would also let the pseudoplankton in the water supply go totally berserk, clogging everythingand those damn things are toxic.
Fat raindrops would come splashing down from the sky, sending ripples of distortion through the advertising displays, drawing streaks on the black glass walls, forming puddles on the street that would turn slick and green with pseudoplankton in minutes.
I was back on the dayside, or maybe in a ditch somewhere with pseudoplankton growing on my tongue.