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Which class of bryozoans lives only in freshwater?

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Eurystomella bilabiata, a moss animal from the Order Cheilostomata. — moss animal *Eurystomella bilabiata*, a moss animal from the Order Cheilostomata.

The class of bryozoans that lives exclusively in freshwater is Phylactolaemata.12

These organisms are characterized by a crescent-shaped lophophore and a hollow flap overhanging the mouth known as an epistome. Unlike other bryozoan classes, which are primarily marine, Phylactolaemata are cosmopolitan and produce special dormant buds called statoblasts to survive in freshwater environments.21