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Catullans were humanoids from Catulla. Catullans were noted starship engineers and many successful design yards were based out of Catulla.

The ubiquitous Yoyodyne Propulsion Systems was co-founded by Terrans and Catullan and was headquartered on Catulla. Their other sciences and society were slightly less advanced, but well up to Federation standards. By the 2260s, they had been members of the Federation for a century. (TOS episode: "The Way to Eden")