Giant Stonefly vs Japanese Giant Stonefly
Side-by-side species comparison
| Attribute | Giant Stonefly | Japanese Giant Stonefly |
|---|---|---|
| Scientific Name | Pteronarcys californica | Oyamia lugubris |
| Order | Plecoptera | Plecoptera |
| Family | Pteronarcyidae | Perlidae |
| Size | 30-50 mm body | 25-35 mm |
| Habitat | Rivers & Streams | Mountains |
| Diet | Herbivores | Predators |
| Regions | North America | Japan |
| 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.
Japanese Giant Stonefly
A large predatory stonefly found in mountainous streams of Japan. Nymphs have powerful mandibles for capturing prey in swift currents.
Did You Know?
It is an indicator of pristine water quality in Japanese mountain streams.