The Alliance of 900 Intelligent Species

The human race evolved on purpose into different physical forms to fit different specializations on different worlds and seated against its own will across the cosmos after being invaded by the species. Over time the combined I guess you call it species the alliance of these myriad different and seemingly unrelated unconnected extraterrestrial species which are actually all related to each other. DNA testing they are able to verify even though they are radically different physically that they are in fact the same species forcefully evolved and diverged by mysterious invading or force in the past. also could create the census and allow for travel vetting the security risk and reward of dealing and creating negotiations with these other intelligent species.