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Yaderans; (right) Origin: Gamma Quadrant. As evidenced by their holographic recreations discovered in 2370, this mostly humanoid and gentle people reflect Terran norms, with distinctive architecture and a yen for light-colored clothing fabrics. Their real forebears were overrun by the Dominion over 390 years earlier. DS9 "Shadowplay" 2-36

Yallitians; Planet: name unspecified. A species with three spinal columns, known for its engineers, and known to Neelix. VOY "Phage"

Yalosians; Planet: name unspecified. A spacefaring species which breathes an atmosphere incredibly acidic and unable to see red or orange in the visible spectrum. The visit by an ambassador of this species to Deep Space Nine caused major refurbishing of his guest quarters, since his atmosphere dissolves the room carpet and it had to be replaced. DS9 " Improbable Cause" 3-66

Yelikans; Planet: name unspecified. Space-faring culture with a transport set for departure from Deep Space Nine in 2370, when Minister Jaro announced Kira's recall to Bajor. DS9 "The Homecoming" 2-21

Yridian; (left) A race of humanoids known as dealers of information. Operators of several deep space freelance spy networks, they can be considered sources of both legal and illegal information. They will sell their secrets to the highest bidder, and therefore are considered a threat to Federation security. Arrest Warrants are outstanding for the leaders of the main Yridian spy networks. Physically they are stooped over, grey skinned humanoids with very loose, flaccid, skin. TNG "Birthright, Part II" 6-142