Zooid

A zooid is a term for a small individual animal, part of a marine colony. The zooids in a colony are usually clones, and may be cytoplasmically connected. Though genetically identical, the zooids in a colony may serve different functions. This is the same as would be the case with a normal metazoan animal, but in a zooid colony the members are more like individuals. 
The word is pronounced "zō-oid", not like zoo. Some examples: