Bryozoans look a lot like corals, but are a different kind of marine animal.
Bryozoans lived attached to shells, rocks and other objects on the sea floor. Colonies of Bryozoans were made of tiny individual animals called zooids. The zooids built up hard skeletons around themselves that together formed the Bryozoan colony. The Bryozoan colonies could grow to be very large, although some colonies, like Archimedes , remained fairly small and delicate in appearance. Archimedes is now extinct, but there are other species of Bryozoans that exist in warm, shallow seas today.