So, I realized (I'm not quite sure exactly when) something about the tribes, and decided to make a blog post about it just now.
The Pyrrhian tribes are all based on the environments they live in. SkyWings are mountain dragons, SeaWings are ocean dragons, RainWings are jungle dragons, et cetera.
The Pantalan dragons are based on life forms. SilkWings are butterfly dragons, HiveWings are bee/wasp/any insect dragons, and LeafWings are plant dragons.
What do you think tribes on other continents could be based on?