This 2009 video is called Mayfly – a life story.
The imprint found at a rocky outcrop near a large shopping center in North Attleboro, Massachusetts, is believed to have been made by an insect about three inches long as it stood on mud some 312 million years ago.
“It’s not a dragonfly but picture a dragonfly-like body. We’re looking at something related, maybe a mayfly. They have the same body plan,” said the discoverer, Richard Knecht, a geology student at Tufts University in Massachusetts.
The giant or Tisza mayfly is Europe’s largest species of mayfly. Unlike other mayfly species, the adults never lose contact with the water surface, trailing their tails along it as they swarm. Sometimes they become confused, however, and mistake wet road surfaces for the river: here.