Meganeuropsis americana

There really is no other way to describe Meganeuropsis (large nerved) other than a giant dragonfly, or rather griffinfly. This insect lived in the Late Permian, although so far only known from the US, and was likely a descendant of the even larger Meganeura. One fossil attributed to it contains the largest fossilized insect wing ever found.

Paleoecology
Although the Great Dying had commenced at this point, Meganeuropsis was not much smaller than its ancestor, with it having a 70 cm wingspan while Meganeura had somewhere over 75 cm. Due to the sheer drop of both oxygen levels and food supply, how this creature was able to sustain itself is unknown. While Meganeuropsis seems to have become quite hardy to adapt, it too succumbed to the Permian extinction. This was the last of griffinflies, so when it went, the whole group did, along with a third of all insects.

Meganeuropsis likely lived like modern dragonflies, albeit accounting its gargantuan size there was a lot more on the menu. Including its regular meals, this griffinfly probably also feasted on small lizards and similar creatures. Its young were just as voracious, devouring the young of the amphibians that were left. However, it just couldn't handle the loss of food and it went extinct, spelling the doom of the griffinflies.