what class is plankton
Bioluminescent Noctiluca scintillans (a dinoflagellate). Plankton is composed of the phytoplankton (the plants of the sea) and zooplankton (zoh-plankton) which are typically the tiny animals found near the surface in aquatic environments.Like phytoplankton, zooplankton are usually weak swimmers and usually just drift along with the currents.lankton is composed of the phytoplankton (the plants of the sea) and zooplankton (zoh-plankton) which are typically the tiny animals found near the surface in aquatic environments.