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Invertebrate zoology is the subdiscipline of zoology that consists of the study of invertebrates, animals without a backbone.
Invertebrates are a vast and very diverse group of animals that includes sponges, echinoderms, tunicates, numerous different phyla of worms, molluscs, arthropods and many additional phyla. Single-celled organisms or protists are usually not included within the same group as invertebrates.
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