Plecoptera

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Stoneflies
Temporal range: Permian - Recent
Adult of genus Eusthenia
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Hexapoda
Class: Insecta
Subclass: Pterygota
Infraclass: Neoptera
Superorder: Exopterygota
Order: Plecoptera
Burmeister, 1839
Suborders

Arctoperlaria

Plecoptera are an order of insects, commonly known as stoneflies. There are some 3,500 described species worldwide, and new ones are still being discovered. Although stoneflies are found worldwide, they are absent from Antarctica. 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.