"Arbitan (species)" is a title based upon conjecture.
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The Marinusians were a humanoid species native to Marinus. They were pacifists until the Voords forced them to fight. They conquered the Voords by fixing the Conscience of Marinus. (TV: The Keys of Marinus)
One account says that the Mondasians, the humanoid race that would evolve into Cybermen, were actually Marinusians. (COMIC: The World Shapers)