#plankton  the aggregate of small plant and animal organisms that float or drift in great numbers in fresh or salt water
  supertype:  living_thing__organism__being  a living (or once living) entity that has (or can develop) the ability to act or function independently
  member:  phytoplankton  zooplankton
  part:  copepod_crustacean
  member of:  congeries__congerie__aggregate__conglomeration  a sum total of many heterogenous things taken together

No statement uses or specializes plankton; click here to add one.