The diophel are an alien (though in some regards not that alien) species of my creation. Here are four posts about them:
Here is a description of their appearance, and some other aspects of their physicality.
Here is a description of their primitive social structure.
Here is a brief history of their social development from that primitive structure through to being interstellar colonists.
Finally, here is a brief overview of their current (well, compared to us right now a few centuries into the future, actually) society.