Arthropods have a fixed number of metameric segments. The metameric segments exhibit a greater degree of specialisation than annelids. Look at the photographs of the winged ant (insect) and house spider below. Note the difference in the number of body segments and legs.
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Phylum Arthropoda
Arthropods have a fixed number of metameric segments. The metameric segments exhibit a greater degree of specialisation than annelids. Look at the photographs of the winged ant (insect) and house spider below. Note the difference in the number of body segments and legs.