Perlidae

Definition

A family of stoneflies (order Plecoptera) comprising more than 50 genera and approximately 1,100 described species. Members are characterized by elongated bodies, well-developed wings held flat over the abdomen at rest, and aquatic nymphal stages that inhabit well-oxygenated streams and rivers. Perlidae are predominantly distributed in eastern North America with worldwide occurrence except Antarctica and parts of Africa; they serve as important bioindicators of water quality due to their sensitivity to environmental change.

Etymology

From the type genus Perla, derived from Latin perla meaning "pearl," referring to the pearly sheen of some species' wings.

Example

The common stonefly Acroneuria abnormis (Perlidae) is frequently used in stream biomonitoring programs because its nymph requires clean, highly oxygenated water and disappears when siltation or organic pollution occurs.

Synonyms

• perlid stoneflies

Related Terms

• Plecoptera
• Perlodidae
• Capniidae
• Leuctridae
• stonefly
• bioindicator
• aquatic insect
• lotic

Usage Notes

Perlidae is one of the largest and most diverse families of Plecoptera, often distinguished from the related Perlodidae by features of the nymphal gills and adult genitalia. The family is frequently referenced in freshwater ecology and biomonitoring literature. Common names include "common stoneflies" or "perlid stoneflies," though specialists generally prefer the scientific name to avoid confusion with other stonefly families.