Common Alderfly vs Cascades Stonefly
Side-by-side species comparison
| Attribute | Common Alderfly | Cascades Stonefly |
|---|---|---|
| Scientific Name | Sialis lutaria | Doroneuria theodora |
| Order | Megaloptera | Plecoptera |
| Family | Sialidae | Perlidae |
| Size | 12-16 mm | 22-30 mm |
| Habitat | Ponds & Lakes | Rivers & Streams |
| Diet | Predators | Predators |
| Regions | Europe, Asia | North America |
| Conservation | Least Concern | Least Concern |
Common Alderfly
A dark smoky-winged insect commonly found near still or slow-moving waters across Europe. Its aquatic larvae are predators in lake and pond sediments.
Did You Know?
Alderfly females lay hundreds of eggs in neat rows on vegetation overhanging water, and the larvae drop into the water upon hatching.
Cascades Stonefly
A large predatory stonefly endemic to Cascade Range streams. Nymphs inhabit cold boulder-strewn torrents at moderate elevations.
Did You Know?
Adults drum their abdomens on streamside surfaces to communicate with potential mates.