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The Pterapede is a large, non-sapient arthropoid native to an unnamed high-gravity planet. Its homeworld has sandy, vegetation-less ground, characteristic of desert planets. Nevertheless, there are large bodies of water where the Pterapede goes to drink and to shed its exoskeleton. Moulting underwater is much easier for the large insectoid, because it reduces the effects of gravity. The Pterapede also has other traits that make it well adapted to survive in a high-gravity environment: it has lungs located on the tip of its tail, which, being a much more effective breathing system than the one used by Earth's bugs, allowed the Pterapede to grow to a much larger size. It also has many legs that are positioned directly under its body, in order to better support its weight. Its wings, however, are not as large as one would expect, because since the gravity is higher, the atmosphere is denser and flight becomes easier.
- Anatomy of an Alien (1998)