SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Flagellate protozoan. Microscope footage of a flagellate protozoan. This is a freshwater protozoan that has a flagellum (thin whip-like structure, right). The protozoan waves its flagellum to move through the surrounding liquid. Protozoa are single-celled micro-organisms that are eukaryotes, meaning they have a cell nucleus. They generally have animal-like behaviour, such as motility. There are over 50, 000 protozoan species, of which about a fifth are parasitic, causing disease in humans and animals. Protozoa range in size from 5 to 500 micrometres (millionths of a metre). Sample taken from the River Teifi, Wales, UK.
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