The Catullans are a humanoid species, native to the planet Catulla. They appear to have the ability to perform a nerve pinch similar to that employed by Vulcans, but it involves pressing the thumbs against the sides of the victim's neck below the ears.
During the late 2260s, the Federation and Catullan government were undergoing fragile treaty negotiations. By 2269, the negotiations had reached a crucial phase when the son of the Catullan ambassador was discovered aboard the stolen space cruiser Aurora, by the USS Enterprise. (TOS: "The Way to Eden")