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The earthworm is a segmented worm with a true coelom which is partitioned into separate segments. There are many internal structures that are repeated within each segment. Each segment is surrounded by both longitudinal and circular muscles allowing earthworms coordinated movement. The fluid filled coelom acts as a hydrostatic skeleton. Each body segment contains four pairs of chaetae, bristles that provide traction for movement. Also the first four segments make up the anterior head region of the external structure of earthworms. The first segment is the periostomium which bears the mouth and the anus is found in the last posterior segment.

My reference is my Biology 191 laboratory manual on invertebrates. (pg's 77-78)

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