Coenobia
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![duplex](/encyclopedia/images/thumb/c/c2/180px-Pediastrum_duplex.jpg)
Pediastrum duplex
Coenobia is the plural of coenobium. It is a colony of cells formed by certain green algae, in which little or no specialization of the cells occurs. The cells are often embedded in a mucilaginous matrix. It is a colony with a fixed number of cells, and may be motile or non-motile.
Examples include Volvox, Pandorina, Scenedesmus, Pediastrum, Hydrodictyon.