Arthropoda is the largest phylum among the invertebrate animals . It consist of more than 900000 species. It is found everywhere in air, water, soil. They are in different shape and size. Arthropods are bilaterally symmetrical, trioloblastic ,metamerically segmented animals with coelom which is reduced and modified. Their body is covered externally in a chitinous exoskeleton which moults periodically and their appendages are jointed.
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