As if its heightened muscle density, hardened skin, and redundant organs weren't enough, this alien appears to have neural implants that facilitate command and control functions. Given the circumstances, this specimen would appear ideal for guard duty.
As if the standard Muton hadn't given us enough trouble, the aliens apparently kept several of these "Elites" in waiting for the later stages of their invasion.
Although they seem to have the distinct honor of serving as guards within the alien hierarchy, our autopsy of this specimen reveals little in the way of distinguishing anatomical traits versus the typical Muton. Aside from various improvements to their armor, the primary difference appears to be a slightly enhanced intelligence which makes them more effective combatants. The details surrounding this creature's specific combat capabilities should be available during future encounters by targeting one in the Unit Analysis View.