- Kingdom: Animalia
- Norwegian: mosdyr
Bryozoans, also known as moss animals, are colonial, with the expeption of a single genus. Many colonies form sheets covering rocky bottoms or algae, they are called encrusting bryozoans. Others build bush-like structures resembling small corals. They are hermaphrodites, they change sex during their life span. Colonies include zooids of both sexes. The often live in separate calcareous boxes. If you look closely the tentacles or lophophores, used to catch food, can be seen stretching out of the boxes. Bryozoans have no respiratory organs, heart or blood vessels. Oxygen is absorbed through the body wall and the lophophores.