Meganeuropsis is an extinct genus of griffinfly known from the Permian of North America, and represents the biggest known insect of all time. He's a descendant of the Permian Meganeura.  feeds on insects and amphibians (such as diplocaulus). These giant dragonflies hunt on the surface of Permians swamps and lakes as do today's fishing birds and feeds on others insects, fishes and amphibians (such as diplocaulus).