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The name annelid comes from the Latin word “anellus,” which means little ring. Annelids' bodies are made up of a series of essentially identical segments running from their heads to their tails. They lack lungs. Some have simple gills, and the rest breathe through their skins, a process that requires constant moisture. Even the simplest annelids have functioning nervous systems, complete with brains. They also have series of ganglia, one per segment, that assist them in controlling their bodies.