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It is the protective fat layer which covers the intestines, just underneath all the skin layers of the abdomen.
The protective layer that covers a leaf is called the cuticle. It is a waxy layer that helps to prevent water loss and protect the leaf from environmental stressors such as pathogens and UV radiation.
The protective outer layers of a plant are composed of dermal tissue, which includes the epidermis and periderm. The epidermis is the outermost layer of cells that covers young plant parts, while the periderm replaces the epidermis in older, woody plant parts. Dermal tissue provides a protective barrier against physical damage, pests, and pathogens.
epidemis
Most of the umbrella mass is a gelatinous material - the jelly - called mesoglea which is surrounded by two layers of protective skin. The top layer is called the epidermis, and the inner layer is referred to as gastrodermis, which lines the gut.
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The pleural membrane covers and protects the lungs.