The jointed appendages and hard exoskeleton of this red reef lobster, Enoplometopus occidentals, are characteristic of arthropods.

SECTION 1 Phylum Arthropoda

SECTION 2 Subphylum Crustacea

SECTION 3 Subphyla Chelicerata and Myriapoda

Phylum Arthropoda

Two-thirds of all animal species belong to the phylum Arthropoda (ahr-THRAHP-uh-duh). This phylum contains a variety of bilaterally symmetrical coelomates, including lobsters, crabs, spiders, and insects. These animals have adapted to almost every environment on Earth.

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