Arthropoda is the most numerous phylum of animals on earth. It is used to classify all animals with a segmented body, numerous jointed legs (sometimes adapted for a different function), and a shell made of a material called chitin. This includes: insects, like beetles and butterflies; arachnids, like spiders and scorpions; crustaceans, like barnacles and lobsters; myriapods, the millipedes and centipedes; and horseshoe crabs and a few other small groups. Living in aquatic environments, on land, and even capable of flight in some cases, arthropods can be considered in numbers and diversity the dominant animal group on earth.
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