The Manarians were a race of Humans in the Pegasus Galaxy who covertly worked with the Genii when it suited both cultures to do so. Smeadon was a high-ranking official of this race. The Manarians may have once been a part of the Genii Confederation before it was destroyed by the Wraith millennia ago.
In 2004, Sgt. Bates made the first trade agreements over food with the people. With not-so-open arms, they admitted almost all of the Athosians and Atlantis expedition members to their world when Atlantis and it's mainland were threatened by a massive hurricane only to sell them out to the Genii, informing Cowen that Atlantis had been evacuated and helping Commander Acastus Kolya find a way to get past the city's defenses with his raiding party. As thanks, the Genii gifted the Manarians with an advanced computer system that was beyond the Manarians level of technology. (SGA: "Underground", "The Storm", "Legacy: Homecoming")
The Manarians were wiped out by the forces of Queen Death six months after Atlantis departed the Pegasus Galaxy. On the Manarian computer system, the Atlantis team found a message left by Queen Death, the first they had heard of the new powerful Wraith queen. (SGA: "Legacy: Homecoming")