Demosponges
Demosponges are a diverse group of marine sponges characterized by their skeleton made of spongin fibers or siliceous spicules. They are filter feeders that obtain nutrients by filtering particles from the water through their porous bodies. Demosponges can be found in a wide range of marine habitats, from shallow coastal waters to deep sea environments. They play a crucial role in marine ecosystems by providing habitat for a variety of organisms and contributing to nutrient cycling.