The Eyren are an all-female humanoid species from the planet Eyren.
In the early 21st century, the Eyren began to suffer from a genetic disease in the male population of the planet. The disease resulted in the sterility of males across the planet, which the Eyren believed would lead them to extinction. However, one scientist named Dr. Ardat discovered a method known as binary cloning, which allowed future generations to be created, but not without sacrificing the male population of their species.
Following contact with the Terran Federation, Eyren citizens became active members of the Terran Federation government. In 2289, it was discovered that Humans and Eyren were genetically compatible enough to have children.