Zoom in on microorganisms

Protozoa

The paramacium Paramecium multimicronucleatumZoomZoom
© Dennis Kunkel Microscopy, Inc.

Protozoa are unicellular and can be oval-shaped, spheric, or elongated. They range in diameter from 1 to 2000 µm (2 mm, thus visible to the naked eye). Some are mobile, thanks to their cillia, which are small accessories resembling hair or flagella with whip-like structures. Their movements are quick and noticeable when a water sample is observed under the microscope.