A genus of single-celled flagellate protozoans (microscopic organisms with whip-like tails) found in water and soil environments.
From Greek 'kerkos' (tail) + 'monas' (unit/being), literally 'tail-being,' named for the distinctive tail-like appendage used for movement.
These microscopic creatures have been evolving in puddles for hundreds of millions of years—they're so simple yet so successful that scientists study them to understand how life itself began.
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