Sponges, in biological and ecological research topics, are basal metazoans (phylum Porifera) characterized by a porous body plan, an aquiferous canal system, and choanocyte-lined chambers that drive water flow for filter feeding, gas exchange, and waste removal. They possess a skeleton of spicules (siliceous or calcareous) and/or spongin fibers and exhibit high cellular plasticity with loosely organized tissues lacking true organs. Sponges play key roles in benthic ecosystems as major filter feeders, mediating biogeochemical cycles (e.g., carbon, nitrogen, silicon) and hosting diverse microbial symbionts that contribute to nutrient transformations, chemical defense, and the production of bioactive secondary metabolites.
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