The Ciliated Protozoan
Tetrahymena pyriformis

Tetrahymena pyriformis is a teardrop-shaped, unicellular, ciliated freshwater protozoan about 50 µm long. Tetrahymena species are very common in aquatic habitats and are non-pathogenic, have a short generation time and can be grown to high cell density in inexpensive media:

In the video you can see the organisms swimming, cilia beating and a dividing cell:

• New Scientist: Zoologger: The hairy beast with seven fuzzy sexes. 2nd March 2011

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