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 (plo͞o′stən, -stŏn′)
Macroscopic organisms that float or swim on the surface of a body of water.

[Greek pleusis, sailing; see pleu- in Indo-European roots + (plank)ton.]

pleus·ton′ic (plo͞o-stŏn′ĭk) adj.


1. (Biology) of or relating to pleuston
2. (Biology) denoting a marine organism held at the surface of the water by a float, such as the Portuguese man-of-war
References in periodicals archive ?
Marine pleustonic (animals at the air-sea interface--Cheng, 1975) insects have three origins: 1) those few species that normally inhabit this surface, mostly water striders of the genus Halobates (Cheng, 1973); 2) normally terrestrial-aerial species transported seaward by air currents (Myers, 1926; Bowden and Johnson, 1976; Locke and Corey, 1986); and 3) normally terrestrial-aerial and freshwater species transported seaward by water currents (Zaitsev, 1970).