Here is a Cretaceous Burmite Midge that appears to show preservation of the indirect flight muscles in one hemithorax. Indirect flight muscles distort the thorax cuticle from the inside to indirectly move the insect’s wings and power flight. While this level of microscopy cannot prove the tissue is muscle, it seems likely that the two sets of power muscles for flight are visible in this fossil: six dorsolongitudinal muscles (DLM) and six dorsoventral muscles (DVM). There are smaller muscles that play a role in guidance and directional movement that may be present but cannot be unambiguously determined without better tools. This midge is on the surface of the amber on its mid-sagittal plane with half of the insect gone.