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Invertebrate animals are those without a cranium and defined vertebral column or spine. In addition to lacking a spine, most invertebrates also lack an endoskeleton. A large number of invertebrates are aquatic animals, and scientific research suggests that many of the world’s species are aquatic invertebrates that have not yet been documented.
Thumbnail: Drosophila melanogaster. (CC BY-SA 2.5; André Karwath aka Aka via Wikimedia Commons).
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