Underwater World Crustaceans Crabs Hermit Crabs Lobsters Shrimp and Prawns Isopods and Amphipods Echinoderms Starfish Brittlestars Sea Urchins Cnidaria Sea Anemones Jellyfish Soft Corals Molluscs Marine Snails Limpets Sea Snails and Sea Hares Mussels, Cockles, Scallops and Oysters Chitons Octopus, Squid and Cuttlefish Fish Rockpool Species Offshore Species Sharks, Skates and Rays Worms Ragworms Scaleworms Fanworms Tubeworms Ribbonworms Sponge Marine Mammals Seals Dolphins Whales Bryozoa Tunicates Sea Squirts Ascidians Seaweed Green Seaweed Brown Seaweed Kelp Red Seaweed