Cell types The sponges lack a well-defined organization of tissues. ![]() Instead, they function as carnivores, capturing small prey with numerous long, thin filaments that cover the body. Sponges are members of the Phylum Porifera, which contains the simplest. The cladorhizids (family Cladorhizidae), a small group of deep-water and cave-dwelling demosponges, lack a water-current system. Structures such as canals, chambers, and cavities enable water to move through the sponge to nearly all body cells. \( \newcommand\): Secondary radial symmetry in echinoderms: The larvae of echinoderms (sea stars, sand dollars, and sea urchins) have bilateral symmetry as larvae, but develop radial symmetry as full adults. Although adult sponges are fundamentally sessile animals, some marine and freshwater species can move across the sea bed at speeds of 14 mm (0.0390. Since water is vital to sponges for excretion, feeding, and gas exchange, their body structure facilitates the movement of water through the sponge.
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