The choanoderm is composed of flagellated collar cells, or choanocytes. Most of the sponge body is a connective tissue, the mesohyl, with internal and external layers of cells, the outer pinacoderm and the inner choanoderm. Individual cells keep their mobility and totipotent ability (they can become other types of cells).
Sponges are organized collections of relatively independent cells. They are efficient filter feeders specializing on bacteria-sized particles. Modified, with permission, from Invertebrate Anatomy OnLineĬopyright 2003 by Richard Fox (Lander University)Īlthough sponges can be found in freshwater, they are much more common and diverse in marine habitats, where they are often important members of benthic communities.
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