- In bats, the skin forming the surface of the wing. It is an extension of the skin of the abdomen that runs to the tip of each digit, uniting the forelimb with the body.
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- The patagium of a bat has four distinctions:
- Propatagium: the patagium present from the neck to the first digit.
- Dactylopatagium: the portion found within the digits.
- Plagiopatagium: the portion found between the last digit and the hindlimbs.
- Uropatagium: the anterior portion of the body between the two hindlimbs.
- In gliding species, such as some lizards, rodents and other mammals, the flat parachute-like extension of skin that catches the air, allowing them to glide.
- In some lepidopterans, one of a pair of small sensory organs situated at the bases of the anterior wings.
