See text Gymnolaemata are a class of Bryozoans.

Gymnolaemata are sessile, mostly marine organisms and grow on the surfaces of rocks, kelp, and in some cases on animals[citation needed], like fish.

Zooids are cylindrical or flattened.

The lophophore is protruded by action of muscles pulling on the frontal wall.

This order includes the majority of living bryozoan species.