Giant Stonefly vs Springfly
Side-by-side species comparison
| Attribute | Giant Stonefly | Springfly |
|---|---|---|
| Scientific Name | Pteronarcys californica | Isoperla signata |
| Order | Plecoptera | Plecoptera |
| Family | Pteronarcyidae | Perlodidae |
| Size | 30-50 mm body | 9-13 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Herbivores | Predators |
| Regions | North America | Europe |
| Conservation | Least Concern | Least Concern |
Giant Stonefly
Large aquatic insects whose nymphs require pristine, cold, oxygen-rich streams. Adults are poor fliers and stay near water. Important food source for trout.
Did You Know?
Stonefly nymphs are so sensitive to water pollution that their presence is used by scientists as a living indicator of water quality — no stoneflies means polluted water.
Springfly
A spring-emerging stonefly of fast-flowing European streams. Nymphs are active hunters that pursue prey among streambed gravels.
Did You Know?
Males locate females by producing species-specific vibrations that travel through the substrate.