Look up: pleuston

1. Pleuston
   Refers to plankton that have a float protruding above the sea surface, such as the Portugese man-of-war.
   Found on http://life.bio.sunysb.edu/marinebio/glo
   
   
2. pleuston
   (from the article `marine ecosystem`) ...Salinity). Body architecture varies greatly in marine waters. The body shape of the cnidarian by-the-wind-sailor (Velella velella)—an animal that ... ...organisms on the seafloor. Large floating seaweeds (for example, Sargassum, which constitutes the Sargasso Sea) and various related multice...
   Found on http://www.britannica.com/eb/a-z/p/80
   
   
3. pleuston
   (Gk: pleura side of the body) living on the surface of the water. Some jellyfish like the by-the-wind sailer and Portuguese man-of-war, and some snails live just underneath or on top of the ocean's surface.
   Found on http://www.seafriends.org.nz/books/gloss
   
   
4. Pleuston
   `Pleuston` are the organisims that live in the thin surface layer existing at the air-water interface of a body of water as their work=Merriam-Webster Online-->--> Examples include some cyanobacteria, some gastropods, the ferns Azolla and Salvinia and the seed plants Lemna, Wolffia, Pistia, Eichorni...
   Found on http://en.wikipedia.org/wiki/Pleuston