"We'd love to have a Horta crew member, but they're rather unfriendly and ugly, don't you think? Besides, they don't have the necessary 'tools' to serve in Starfleet. They're better off in support positions behind the scenes."
Nevertheless, the idea of a Horta crew member didn't reach Capt. Picard. Or the writers of his ST:TNG adventures.
Ah. The Horta character Naraht appeared in both the comics and Diane Duane's novels. I've read several of her novels, including The Romulan Way, so I've read about Naraht. I just didn't remember him from the books.
Another novel has an entire starship of Hortas. Which makes more sense than trying to mingle air- and rock-based crew members.
Funny how novelists think of such sci-fi ideas routinely but TV writers almost never do.
For more on Star Trek, see Is Captain Kirk a Conservative? and Miramanee in Star Trek Continues.