Small-headed Stonefly vs Hooked Stonefly
Side-by-side species comparison
| Attribute | Small-headed Stonefly | Hooked Stonefly |
|---|---|---|
| Scientific Name | Perlodes microcephala | Agnetina capitata |
| Order | Plecoptera | Plecoptera |
| Family | Perlodidae | Perlidae |
| Size | 15-22 mm body | 20-30 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Predators | Predators |
| Regions | Europe | Eastern North America |
| Conservation | Least Concern | Least Concern |
Small-headed Stonefly
A large spring-emerging stonefly found in clean upland rivers. Nymphs are predatory, feeding on mayfly and midge larvae. An important bioindicator species.
Did You Know?
Nymphs require the cleanest, most oxygen-rich water of any stonefly, making them sensitive pollution indicators.
Hooked Stonefly
A large, patterned stonefly of eastern North American rivers with distinctive hooked anal gills. Nymphs are active nocturnal predators under cobbles.
Did You Know?
Its nymphs are nocturnal, hiding under rocks by day and actively hunting at night.