Palamok

Palamok is the Yanme'e homeworld. Its atmospheric composition is similar to that of Earth, yet inhospitable to humans. It has average surface temperatures of 29°C to 42°C (84.2°F to 107.6°F), and its gravity is two times that of Earth. This would present a challenge on the evolution of the wings of the Yanme'e, but it gives them excellent flight skills in the gravity of Earth.

Description
It seems illogical for an airborne insectoid race to have evolved on a high gravity planet (unless they were placed there by the Forerunners), because the greater gravity would have caused the exoskeleton of insects of that size to collapse upon itself, thus restricting the size of insects in the same manner as it is here on Earth. They would likely be incapable of flying even in Earth's gravity (due to their heavy exoskeleton) if it were not for their antigravity generators. Some have proposed that their exoskeletons are hollow, with a lattice work of struts similar to the bones of birds. This is certainly likely, and would be a needed adaptation for such a large creature to fly in Earth's gravity (as well as to simply keep from collapsing under its weight) but it would simply not be enough to fly in 2.2Gs. Of course their antigravity technology would allow them to exist on Palamok, but this still begs to question as to how they evolved in the first place.

One of the most likely answers to the problem of Yanme'e evolution may be found on one of Palamok's four moons; Naxook, Oquiu, Ka'amoti and Kami. Palamok is large enough to support an approximately Mars sized moon with roughly half the gravity of Earth. This would certainly be the ideal location for a large flying insectoid species to evolve. It's possible that they evolved sentience and and eventually space flight and antigravity technology on one of these four moons. The development of small antigravity generators would have allowed them to colonize Palamok in much the same way as spacesuits would allow humans to colonize Mars. Since Palamok is a very large world, it would likely support more Yanme'e then their actual world of origin.It is also possible that they have air sacs similar to Huragok, though they would have to be internal as none can be seen on the outside.

Trivia

 * Guardian may be set on Palamok, because Yanme'e screeches can be heard if the player listens carefully enough.