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MO4006: Rotifers of the genus Collotheca use five tufts of relatively long tentacle-like cilia known as setae, surrounding the very large corona. Most rotifers possess chitinous jaws called trophi that are used for grinding ingested food. Often only the trophi are found as fossils, and the oldest, embedded in amber, date them to the Eocene epoch (38 to 55 million years ago).

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