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The common earthworm (Lumbricus terrestris) is an abundant species, which has an important role in the aeration and fertilisation of soil. It is the largest British earthworm and has a reddish-brown back, a yellowish underside and an often prominent orange-red 'saddle' region known as the 'clitellum', close to the reproductive organs. Although this earthworm has a cylindrical body, the tail region may become flattened. The body is segmented and has visible rings known as ‘annuli’; each segment bears small hairs known as 'chaetae', which help the worm to move through the soil.

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