The mutant acklay was a variety of amphibious acklay native to Vendaxa that had been mutated by the toxins of Golbah's Pit. Many lived under the waters of the Ebon Sea, where they hunted creatures within the sea and surfaced to attack prey on land. Mutant acklays were hardier than standard acklays, and had heavier claws. Their shells were a glossy black.
- Star Wars Galaxies: An Empire Divided (First appearance)
- Geonosis and the Outer Rim Worlds (First mentioned)
- The New Essential Guide to Alien Species
- The Complete Star Wars Encyclopedia