The Akaali were a pre-industrial humanoid civilization that the Enterprise NX-01 encountered in 2151, inhabiting a Minshara class homeworld. They had anterior crests on either side of the forehead.
Despite their primitive technological level, their forensic methods were apparently rather impressive, T'Pol and Phlox both expressing admiration for the work of an apothecary owner. Another race, known as the Malurians, were exploiting their planet without their knowledge. The use of tetracyanate 622 caused many of the Akaali to suffer from a serious disease, causing lesions on their faces, before the Malurians were driven off the planet by Enterprise.
Riaan was a member of this species. (ENT: "Civilization")