1) Minute water life 
Neuston is the collective term for the organisms that float on the top of water (epineuston) or live right under the surface (hyponeuston). Neustons are made up of some species of fish (see flying fish), beetles (see whirligig beetle), protozoans, bacteria and spiders (see fishing spider and diving bell spider). Collembola in the genera Podura and...
minute organisms floating or swimming on water's surface
group of organisms found on top of or attached to the underside of the surface film of water. The neuston includes insects such as whirligig beetles ... [2 related articles]
neuston, neustont, neustonic, neustic 1. Minute organisms existing in or dependent upon the surface film of a body of water. 2. Small to medium-size organisms that live on (epineuston) or under (hyponeuston) the surface film of water bodies.
Planktonic organisms associated with the air-water interface. 
the aggregate of minute aquatic organisms that float or swim in the surface film of a body of water.