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Invertebrates are a diverse group of animals that includes over 30 phyla. Invertebrates do not have a backbone, nor a bony skeleton. This large group of animals includes sponges, cnidarians, flatworms, roundworms, segmented worms, molluscs, echinoderms, and arthropods. About 97 percent of all known species are invertebrates. The articles listed below provide information about the characteristics, classification and evolution of invertebrates.

Invertebrates are animals that do not have a backbone or a bony skeleton. This profile explores basic facts about invertebrates including how they are classified, what they eat, where they live and the characteristics that make them different from other animal groups.

Facts About Invertebrates
Learn interesting facts about invertebrates and find out about their diversity, evolutionary history and the characteristics make them different from other animal groups.

A Guide to Vertebrates and Invertebrates
Among the most basic criteria by which animals are described is whether or not they possess a backbone. This single trait places an animal into one of just two groups: the vertebrates or the invertebrates.

Invertebrate Pictures
Pictures of invertebrates including horseshoe crabs, jellyfish, ladybugs, snails, spiders, octopus, chambered nautiluses, mantises, and more.

The Basic Invertebrate Groups
An introduction to six basic groups of invertebrates including arthropods, cnidarians, echinoderms, mollusks, segmented worms, and sponges.

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