Barzan

From Memory Alpha, the free Star Trek reference.

The Barzans were a humanoid species native to the planet Barzan II. In appearance they have light-copper to tannish skin, with some facial ridges and a hairline set far back from the forehead. When leaving their homeworld, they have to wear a breathing device which provides them with the gases that are found in the toxic atmosphere of Barzan II.

The Barzans are a resource-poor species and technologically only moderately advanced. When the Barzan wormhole was discovered in 2366 the lack of other resources was a major factor in the Barzans' decision to sell rights to the wormhole to the strongest bidder. (TNG: "The Price")