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Sponges, Cnidarians, Worms, Lophophorates, Molluscs, Arthropods, Echinoderms, and Hemichordates are all animals that lack backbones and are known as invertebrates . Over 98% of species are invertebrates. Some invertebrate phyla have only one species, while others, like Arthropoda , include more than 83% of all described animal species with over a million species!

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