The Arkonians were a species of humanoid reptilian native to the Alpha or Beta Quadrant. The Arkonians were warp-capable since the 2050s. Soon after, Vulcans established first contact with them. (ENT episode: "Dawn") Vulcans generally considered the Arkonians to be aggressive, dangerous and irrational. (ENT - The Romulan War novel: To Brave the Storm)