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There are zero invertebrates that have backbones. There are ten phyla of invertebrates and one that contains invertebrates as well as vertebrates.
Arthropoda (Spiders, insects, lobsters etc.)
Mollusca (Octopus, snails, clams, etc.)
Porifera (Sponges)
Coelenterata (jelly fish, corals, hydra, etc.)
Playhelminthes (flat worms)
Nematoda (round worms)
Annelida (segmented worms)
Echinodermata (sea stars, sea urchins, sea cucumbers etc.)
Rotifera (Rotifers)
Onchyohora (walking worms)
Chordata (not all chordates are invertebrates)
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