Sand Fly Caddis vs American Grannom
Side-by-side species comparison
| Attribute | Sand Fly Caddis | American Grannom |
|---|---|---|
| Scientific Name | Glossosoma intermedium | Brachycentrus americanus |
| Order | Trichoptera | Trichoptera |
| Family | Glossosomatidae | Brachycentridae |
| Size | 6-9 mm | 9-13 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Omnivores | Omnivores |
| Regions | North America | North America |
| Conservation | Least Concern | Least Concern |
Sand Fly Caddis
A small caddisfly whose larvae build distinctive tortoise-shell-shaped stone cases. They are important grazers on algae-covered stream rocks.
Did You Know?
Glossosoma larvae abandon and rebuild their dome-shaped cases each time they need to move to a new grazing site.
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.