Black Sedge vs American Grannom
Side-by-side species comparison
| Attribute | Black Sedge | American Grannom |
|---|---|---|
| Scientific Name | Silo nigricornis | Brachycentrus americanus |
| Order | Trichoptera | Trichoptera |
| Family | Goeridae | Brachycentridae |
| Size | 7-9 mm body | 9-13 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Omnivores | Omnivores |
| Regions | Europe | North America |
| Conservation | Least Concern | Least Concern |
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.
American Grannom
A case-building caddisfly whose larvae attach their cases to rocks in fast current and filter-feed. Cases are chimney-shaped and built from silk and plant fragments.
Did You Know?
Larvae can switch between filter-feeding and scraping algae depending on current speed.