nannoplankton
/ˈnænoʊˌplæŋktən/
noun
- Very tiny plankton, usually smaller than 50 micrometers, that float in water.
- These tiny nannoplankton form the base of many marine food webs.
- Scientists study nannoplankton to understand ocean health.
- Nannoplankton are so small they can only be seen with a microscope.