Spotted Hydropsyche Caddisfly vs Western Grannom Caddis
Side-by-side species comparison
| Attribute | Spotted Hydropsyche Caddisfly | Western Grannom Caddis |
|---|---|---|
| Scientific Name | Hydropsyche slossonae | Brachycentrus occidentalis |
| Order | Trichoptera | Trichoptera |
| Family | Hydropsychidae | Brachycentridae |
| Size | 10-14 mm | 9-12 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Detritivores | Omnivores |
| Regions | Eastern North America | Europe |
| Conservation | Least Concern | Least Concern |
Spotted Hydropsyche Caddisfly
A net-spinning caddisfly with tan to brown mottled wings. Larvae build intricate silken nets between rocks to capture drifting food particles in stream currents.
Did You Know?
The mesh size of their silk nets varies by species, allowing different species to partition food resources in the same stream.
Western Grannom Caddis
A widespread European caddisfly forming mass emergences in spring on alkaline rivers. Larvae build four-sided tapering cases and filter-feed in riffles.
Did You Know?
Spring Grannom hatches on English chalk streams can darken the sky with millions of emerging adults.