Pteronarcyidae

Definition

A family of large-bodied stoneflies (order Plecoptera) commonly known as giant stoneflies or salmonflies. Adults are among the largest Plecoptera, with wingspans exceeding 50 mm in some species. Larvae are aquatic, inhabiting cool, well-oxygenated streams where they are shredder-detritivores, processing coarse organic matter. The family is particularly significant in western North American river systems, where synchronous mass emergences provide critical seasonal food pulses for salmonid fishes and riparian predators.

Etymology

From Greek pteron (wing) + narkē (numbness, referring to the narcotic effect attributed to some stoneflies), with the family suffix -idae.

Example

Pteronarcys californica, the salmonfly, produces spectacular riverbank emergences in Rocky Mountain streams each June, with adults living only a few days to mate and oviposit.

Synonyms

• Giant stoneflies
• salmonflies

Related Terms

• Plecoptera
• Perlidae
• Capniidae
• Leuctridae
• shredder
• Emergence
• benthic macroinvertebrate

Usage Notes

The common name 'salmonfly' is sometimes applied specifically to Pteronarcys californica, the best-known North American species, but is also used more broadly for the family. Distinguish from 'golden stoneflies' (family Perlidae, especially Calineuria), which are often smaller and emerge later in the season. Larvae are distinguished from other Plecoptera families by their large size, branched thoracic gills, and two caudal filaments of unequal length.