Definition: A single, distinct individual animal in a colony of invertebrates such as bryozoans or hydrozoans. Multiple zooids are often attached to each other. A group of zooids may function as a single animal.
Sources:
- Burnie D, Wilson DE. 2001. Animal. London: Dorling Kindersley. 624 p.
- Keeton, W.T. and J.L. Gould. 1986. Biological Science (4th Edition). New York: W.W. Norton & Co Ltd.
