Earthworm has a segmented cylindrical body covered by a thin cuticle below which is the epidermis. This skin is always kept very moist by the secretion of mucus from the epidermis and body fluids from the excretory pores. It always lives in moist soil especially during the day. This prevents their skin from drying or desiccation.
Earthworm
The epidermal layer has blood capillaries, which have looped out from the vascular system circulating the blood. These blood capillaries are so close to the skin that the gases can diffuse from the surroundings into and out of the blood through the skin and the capillary walls. The blood contains haemoglobin in solution which circulates the gases through the body.
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