Annelids, or also known as segmented worms, are constructed by way of a tube within a body tube (Annelids have a complete gut. They have a mouth and an anus). This digestive tract runs through the center of the body. Segmented worms are known for being segmented externally as well as internally. The internal walls that separate the parts of the annelid are called septa (singular: septum). Most of these septa are similar but, there is a varying degree of similarity because some septa are needed to preform specialized tasks. For example, the first segments may carry one or more pairs of eyes and another one will be specialized other sense organs.
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