A Federation member species with tall, bald, lobed skulls and pointed ears, seen on the Federation Council in Star Trek IV: The Voyage Home and among Starfleet officers in Star Trek VI.
The Arkenites are humanoids with an enlarged hairless cranium divided into rounded lobes, long pointed ears and pale skin. They are usually shown wearing a band or headset around the skull.
They first appear in Star Trek IV: The Voyage Home, where Arkenites sit in the Federation Council chamber during the Klingon ambassador's complaint against Kirk and again at Kirk's hearing. An Arkenite Starfleet officer is also present at the classified briefing on the Klingon peace initiative in Star Trek VI: The Undiscovered Country.
The species is not named in dialogue in either film. The name comes from production material written for The Voyage Home, which was circulated to explain the new council aliens and has been used for them ever since.