a phylum of the Metazoa, comprising a group of sessile, aquatic animals possessing an endoskeleton and many branching canals, lined by flagellated collar cells; communication of the canals with the surface is made through many pores or through larger openings and oscula.
[L. porus, pore, + fero, to bear]
See Also: Parazoa
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Examples: glitazone, GI cocktail, etc.