Leaf Mining Fly

A 1 mm fly of the Family Agromyzidae or Leaf Mining Flies. They are usually minute since their larvae mine tunnels between the layers of leaves. Many are important pests of cultivated or agricultural plants. They really are too small for a normal macro lens and would look better under a microscope. Some of the larval Leaf Mines are blotches while others are long and serpentine (see references as well as this spotting:
https://www.projectnoah.org/spottings/19560047/fullscreen).