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Sponges and Cnidarians sponges • Sponges are primitive, sessile, waterdwelling filter feeders that pump water through their bodies to filter out bacteria and protists. • Sponges can reproduce sexually and asexually cnidarians • Cnidarians are animals that have stinging cells and take their food into a hollow central cavity. • Cniderians have two basic body forms, polyps and medusas. • Medusa forms are free floating, jelly-like and often umbrella shaped. • Polyps are usually attached to an object and tube-shaped. Cniderians use their stinging cells to inject venom into their prey… …then use their tentacles to pull the prey to their mouths. Corals • Corals are the cniderian responsible for coral reefs. They find a hard substance to attach to and then build a hard skeleton around their soft bodies. They can reproduce rapidly. • The Great Barrier Reef is over 2000 km long