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In page Fauna of Australia:

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A huge variety of marine invertebrates are found in Australian waters, with the Great Barrier Reef an important source of this diversity.[citation needed] Families include the Porifera or sea sponges,[30] the Cnidaria (includes the jellyfish, corals and sea anemones, comb jellies),[31] the Echinodermata (includes the sea urchins, sea stars, brittle stars, sea cucumbers, the lamp shells)[32] and the Mollusca (includes snails, slugs, limpets, squid, octopus, cockles, oysters, clams, and chitons).[33]