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Arthropoda The largest number of species in the animal kingdom belongs to the phylum Arthropoda. Members  of this phylum, called arthropods, include such animals as spiders, ticks, centipedes, lobsters, and  insects. All animals in the phylum have an external skeleton, a segmented body, and jointed  appendages. The external body skeleton of arthropods is the  exoskeleton.  It surrounds the animal and provides  support. The bodies of arthropods are often divided into distinct regions called the head, thorax, and  abdomen. Mouthparts exist in the head region. Antennae, the sense organs, are located on the head  also, if they are present. Respiration in the arthropods occurs through microscopic holes in the  exoskeleton and body wall. Branching networks called  tracheae  extend from these holes to all parts  of an arthropod's body.  Five major classes divide the phylum Arthropoda. The first two classes include the centipedes and 
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