The Irapina were a people from the Sagittarius Arm of the galaxy. They were headed toward the United Federation of Planets, dominating all species in their path. Their arrival was estimated at one thousand years, give or take a hundred. They are like the Arivne, as they were telepathic, but were also emotional and belligerent. The life span of some Irapina was as long as two thousand years. This group harvested organs from other Irapina for use as replacement parts.