1) Animal order 2) Order plecoptera 3) Stoneflies 
The Plecoptera are an order of insects, commonly known as stoneflies. Some 3,500 species are described worldwide, with new species still being discovered. Stoneflies are found worldwide, except Antarctica. Stoneflies are believed to be one of the most primitive groups of Neoptera, with close relatives identified from the Carboniferous and Lower Pe...[moth] Plecoptera is a genus of moths of the Erebidae family. ...
[n] - stoneflies
the Stoneflies (Order Plecoptera) are a small group of aquatic insect. There are a little under 40 British species.
order Plecoptera noun stoneflies