There are so many different organisms in the phylum Arthropoda that they have to be divided into subphyla.

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The phylum Arthropoda is incredibly diverse, containing millions of species, and is divided into several subphyla such as Chelicerata (which includes spiders and scorpions), Crustacea (crabs, lobsters, and shrimps), and Hexapoda (insects and their relatives), among others, to manage this diversity.

There Are So Many Different Organisms in the Phylum Arthropoda