neuston
Concise Oxford English Dictionary © 2008 Oxford University Press:
neuston /ˈnjuːstɒn/
▶noun Biology the small organisms living in or on the surface of water.
– derivatives
neustonic adjective.
neustonic adjective.
– origin via Ger. from Gk, neut. of neustos ‘swimming’, on the pattern of plankton.
'neuston' also found in these Oxford entries:

