(from the article `moss animal`) ...The avicularium type of zooid has a small body and a rudimentary polypide; the operculum, however, is proportionally larger, has strong adductor ...
Found on http://www.britannica.com/eb/a-z/a/130


The avicularium (pl. avicularia) in cheilostome bryozoans is a modified, non-feeding zooid. The operculum, which normally closes the orifice when the zooids tentacles are retracted, has been modified to become a mandible. Strong muscles operate it. The polypide is greatly reduced, and the individual receives nourishment from neighboring zooids. Th...
Found on http://en.wikipedia.org/wiki/Avicularium
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