An undescribed bibionid fly (fungus gnat) from the middle Miocene Esmeralda Formation, Fossil Valley, Great Basin Desert, Nevada. Millimeter scale at lower left of image. Fossil Valley is now a federally protected area; unauthorized collecting there is strictly verboten. Photograph taken by an individual named Marwa W. El-Faramawi, courtesy Copyright © 2015 University of California Museum of Paleontology. I modified the image with photoshop.

Note that identification of fossil and its assignment to a geologic rock formation are my responsibility, and do not necessarily reflect the opinions of the University California Museum of Paleontology.