A class or group of horny sponges, particularly silica-based sponges with skeletal structures made of spongin fibers.
From Greek 'keras' (horn) + 'spongia' (sponge) + Latin plural '-ae'. This is an older taxonomic term for sponges with horn-like skeletal fibers.
Ceratospongiae sponges like the common bath sponge are living creatures that filter-feed by pumping water through their bodies—one sponge can process thousands of liters of water daily, acting like nature's own water purification system.
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