Primal was the name for the inhabitants of Bryyo who scorned science and technology in all it's forms. When the Lords of Science openly renounced them in the capital, they attacked begining a great war that they would eventually win. Some still live and appear in the game as reptillicus and reptillicus hunters, enemies of Samus because of the Leviathan drove them mad, much like the Chozo Ghost
Appearance
They really look like a giant lizard. Most of which Samus encounters on Bryyo have boomerangs in their arsenal. They have a tan color and they are slightly a bit taller than Samus.