Aviatik D.VI

In 1918 Aviatik was working on various prototypes of single-seat fighter at the same time. Two of them, the Aviatik D.IV and D.V were powered by the Benz Bz IIIbv which was a larger version of the Benz BzIIIbm. The D.V was powered by that same engine but was a new design which discarded flying wires. Unfortunately there it seems that there aren't pics of these models, or at least we couldn't find any.

The D.VI was the only prototype among those three that was flown in August 1918 and had little resemblance to the previous Aviatik fighter projects. It was a two-bay biplane made out of wood with ply-covered fuselage and fabric covered wings and tail surfaces.
It was armed with the usual pair of German 7,92mm LMG 08/15 machine guns and powered by the Benz IIIbm engine. It was intended to take part in the second D-type contest held in Adlershof in June 1918 but due to some engine problems it didn't make it in time. However, when tested in August 1918 it revealed excellent flying characteristics.

Sources:
1. Salamander Books - The Complete Book of Fighters