The first hairy microbes: New fossils reveal oldest known ciliates

Anyone who has taken high school biology has likely come into contact with a ciliate. The much-studied paramecium is one of 7,000 species of ciliates, a vast group of microorganisms that share a common morphology: single-celled blobs covered in tiny hairs, or cilia. These cilia — Greek for “eyelash” — are used to propel a microbe through water and catch prey.

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