dead on a rock by the river
Plecoptera are an order of insects, commonly known as stoneflies. There are some 1,700 recorded species worldwide, and new ones are still being discovered. Stoneflies are believed to be one of the most primitive groups of Neoptera, with close relatives identified from the Carboniferous and Lower Permian geological periods, while true stoneflies are known from fossils only a bit younger. The modern diversity however apparently is of Mesozoic origin.
