For the similarly named species, please see Tarkan.
The Tarkanians were a species that was in contact with the Federation.
A Tarkanian diplomat was transported aboard the USS Enterprise-D in 2367 and left the ship shortly before stardate 44769.2. After that, he traveled to the Cruces system where he disappeared under mysterious circumstances. (TNG: "The Drumhead")
This species was only mentioned in dialogue.