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All animals in the Chordate Phylum have backbones. They are also called vertebrates.. The Chordate Phylum is split into Classes. Several Classes are listed below:
Phylum: Arthropoda. The animals in this phylum all lack back bones and are known as invertebrates. They also all have external skeletons (exoskeleton), jointed appendages and segmented body. The name of this phylum literally means jointed (from Greek arthron) foot (from Greek podos). Arthropods are the largest group of animals in the world and members of this group can be found in every type of environment. Arthropods range in size, from less than a centimeter to over 3 meters. Some of the most commonly known arthropods include ants, butterflies, spiders, shrimp, and lobsters. Subphylum: Crustacea. Animals in this group all have two-parted limbs, two pairs of antennae at some point in their life, and three body parts (head, thorax, and abdomen).