Meganeura

Information
Meganeura monyi was a species of large carnivorous griffonfly which lived in the Carboniferous Period some 300 million years ago. It evolved to occupy the insect-eating niche which pterosaurs, birds, and bats have since taken over millions of years later. Meganeura was the largest flying organism of its time, and was among the largest flying invertebrates of all time with a wingspan of just over 2 feet, or 70 centimeters, in length. Its large size can be explained by the overproduction of oxygen in the atmosphere at that time, which allowed insects to grow bigger as their simple respiration system was no longer as much of a constraint. The insects eventually lost their size as the level of oxygen in the atmosphere has since decreased to approximately 21% oxygen compared to the 35% atmospheric oxygen concentration at the time of the large insects' existence.

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