Legaran

The Legarans are a species native to the Alpha Quadrant world of Legara IV. The species lives in pools of thick liquids that are maintained at a temperature of 150 &deg;C and dislike bright areas. They are noted for their strict observance of protocol. (TNG episode Sarek).

Ambassador Sarek of Vulcan began a dialog with the race in the 2270s. By the 2290s he was confident that his relationship with them would bear fruit, but felt that the Federation would have to be patient with the Legarans. (TOS novel The Fearful Summons).

The Cardassians later began initial talks with the Federation in 2327. These talks were merely a ploy on their part to sabotage Ambassador Sarek's negotiations with the Legarans. (TOS comic Enter the Wolves)

By 2366, treaty negotiations between Sarek and the Legarans had progressed far enough that a conference to sign the treaty was scheduled to take place in orbit above the Legaran homeworld. The USS Enterprise (NCC-1701-D was detailed to take Sarek to Legara to conduct the negotiations with the Legara. Sarek intended this to be his final mission, after which he would finally retire.  However at this point he was suffering from Bendii Syndrome, and experienced bursts of emotion.  Because Sarek was a powerful telepath, the emotions were projected on to others, causing random outbreaks of violence on board the Enterprise.  Captain Jean-Luc Picard was forced to consider canceling the conference as Legarans would have been affected as well by Sarek's condition.  But the conference was allowed to go forward when Sarek performed a mind meld with Picard, gaining Picard's emotional control long enough to conclude negotiations and sign the treaty.  With the negotiations complete and the treaty signed after 93 years of word, Sarek returned home to Vulcan. (TNG episode Sarek)