Tanugans were distinguished by their up-swept eyebrows and two to three successive V-shaped ridges on their foreheads, which echoed the brow line. Both genders preferred stiffly up-swept hairstyles. Tanugan males had very pronounced receding hairlines and enlarged foreheads. The foreheads of Tanugan females were only slightly enlarged.
In the Tanugan system of justice, the accused were guilty until proven innocent. In 2366, this became a problem for Commander William T. Riker of the USS Enterprise-D, as he was accused of the murder of Tanugan scientist Dr. Nel Apgar. (TNG: "A Matter of Perspective")