What is the epidermis in a earthworm?

The epidermis in an earthworm is the outermost layer of skin that serves as a protective barrier for the organism. It is a thin layer composed of epithelial cells, which can secrete mucus to aid in moisture retention and facilitate movement through soil. The epidermis also contains sensory cells that help the earthworm detect its environment. Overall, it plays a vital role in respiration and protection against pathogens.