protozoea

Example:Unlike benthos, protozoea remain in the water column.

Definition:Organisms that live at the bottom of a body of water, such as the seafloor.

Example:Protozoea are considered zooplankton, whereas nekton refers to freely swimming organisms.

Definition:Aquatic animals that can swim independently of the water currents and, with respect to hydrodynamics, behave as buoyant neutrals or positive immersed bodies.