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EARTHWORMS Earthworms are classified as Annelida. Annelida mean little rings which refers to the many segments in their body. The structure of an earthworm’s body is made up of more than one hundred segments separated by partitions that divide the coelum. All segments are identical except by the anterior and posterior ends. The anterior segments reflect the cephalization that is an adaption of burrowing. The head of the earthworm contains the sense organs. The …

…earthworms are join to head to tail it’s called mating. Together they form a mucus around each other. They both inject sperm into the mucus. One of their sperms goes to a pouchlike seminal receptable. After a several days a mucus and chitin sheath is secreted by the clitelllum a swelling around the sex organs. When the worm wriggles to slip the sheath off its body, eggs, and sperm are joined and fertilization occurs.