Tellarites were a humanoid species native to the planet Tellar Prime in the Beta Quadrant.
Tellarites were on average shorter than humans. They had distinguished snouts and the males wore large beards. Tellarites had three fingered hands that had a hoof-like appearance.
Tellarites were known as an impatient people. They were also fond of arguing, so much so it was considered a sport on their homeworld. (ENT: "Babel One", "Bounty")
By the mid-20th century, Tellarites possessed warp technology. (ENT: "Carbon Creek")
During the 22nd century, the Tellarites had an adversarial relationship with the Andorians. This relationship improved in the 2150s to the point where in 2155 they entered into talks that included the Andorians to form a Coalition of Planets. (ENT: "Babel One", "Demons")
In 2161, the Tellarites were one of the founding members of the United Federation of Planets. (ENT: "Zero Hour")