Meganeuropsis americana

Meganeuropsis is an extinct genus of griffinfly, order Meganisoptera, known from the Early Permian of North America, and represents the biggest known insect of all time. Meganeuropsis permiana described in 1939 from Elmo, Kansas. It was one of the largest known insects that ever lived, with a reconstructed wing length of 330 millimetres, an estimated wingspan of up to 710 millimetres, and a body length from head to tail of almost 430 millimetres.