KingDaniel wrote:

There were a couple of male Caitians (a ginger one and a black one) in the background of STIV. They're canon! 
|
Yep. I have read conflicting interviews with the makeup team for that movie. One, about the time of the movie, said that yes TAS was an inspiration for those aliens. A few years later, a different interviewee thought it was just coincidence. But FASA RPG's "ST IV Sourcebook" had already assumed the two felinoids were Caitians and featured their pics in that manual.
Caitian of ST IV by
Therin of Andor, on Flickr
Dark Caitian of ST IV by
Therin of Andor, on Flickr
The publicity pics have inspired the inclusion of Caitians in numerous licensed projects since, such as Marvel/Paramount's "Starfleet Academy: Telepathy War":
Cadet Caitian by
Therin of Andor, on Flickr