bryozoan skeletons grow in a variety of shapes and patterns: mound-shaped, lacy fans, branching twigs, and even corkscrew-shaped. their skeletons have many tiny openings. each opening is the home of "zooid". they have a body with a u-shaped gut, opening at the mouth and at the anus. they feed with their lophophore. the tentacles of the bryozoans are ciliated. the beating of the cilia creates a current of water which drives food (mainly phytoplankton) towards the mouth. in some groups, notably some ctenostomes, a gizzard may be formed.