Grannom Caddisfly vs Black Sedge
Side-by-side species comparison
| Attribute | Grannom Caddisfly | Black Sedge |
|---|---|---|
| Scientific Name | Brachycentrus subnubilus | Silo nigricornis |
| Order | Trichoptera | Trichoptera |
| Family | Brachycentridae | Goeridae |
| Size | 8-12 mm | 7-9 mm body |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Detritivores | Omnivores |
| Regions | Europe | Europe |
| Conservation | Least Concern | Least Concern |
Grannom Caddisfly
A small dark caddisfly that produces massive spring hatches on European rivers. Larvae build distinctive square-sectioned cases from silk and plant fibers.
Did You Know?
Grannom hatches are so dense on some rivers that local people historically swept up mounds of dead adults to use as fertilizer.
Black Sedge
A caddisfly whose larvae build heavy cases from sand grains cemented with silk. Found in clean, stony streams. Cases have lateral flanges of larger stones for ballast.
Did You Know?
Larval cases have added flanges of larger stones that act as ballast, preventing the case from being swept away.