Some alien species in Star Trek have made very fleeting appearances on screen, but may have very interesting behind-the-scenes lore or developments in non-screen media. Arkenites and Chelons are previous examples from this site.
The Kazarites are one such species, having been seen only on-screen fleetingly in Star Trek: The Motion Picture. They were given a backstory by their designers Fred Phillips and Robert Fletcher (who also designed many other species for the screen).
Kazarites are a Federation species with telekinetic and animal telepathy powers. A peaceful vegetarian species, they are expert ecologists and veterinarians due to their special abilities. They may make fine officers in the Science Department.