Stoneflies (Order Plecoptera) are a small group of aquatic insect. There are a little under 40 British species.

Although as adults they resemble in many ways Lacewings (suborder Plannipennia) and Alderflies (suborder Megaloptera), they are more closely related to Mayflies (Ephemeroptera).

A photograph of an adult Stonefly

A photograph of an adult Stonefly.
Photograph by Haplochromis licensed under Creative Commons.

Other names for (or types of) Plecoptera include:

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