No, crabs are crustaceans, part of the largest group of arthropods. The three main groups of arthropods include crustaceans, insects, and arachnids. Arthropods usually have between six and ten legs, are an important part of the food chain accounting for three out of four of all animals, and have a thick outer skin called and exoskeleton.
There are about 30,000 species of crustaceans, including all types of crabs, hermit crabs, lobsters, shrimp and even barnacles. Most live in the sea but there are some freshwater species as well.
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