Western Grannom Caddis vs Great Grey Sedge
Side-by-side species comparison
| Attribute | Western Grannom Caddis | Great Grey Sedge |
|---|---|---|
| Scientific Name | Brachycentrus occidentalis | Arctopsyche grandis |
| Order | Trichoptera | Trichoptera |
| Family | Brachycentridae | Hydropsychidae |
| Size | 9-12 mm | 20-30 mm |
| Habitat | Rivers & Streams | Mountains |
| Diet | Omnivores | Omnivores |
| Regions | Europe | North America |
| Conservation | Least Concern | Least Concern |
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.
Great Grey Sedge
One of the largest net-spinning caddisflies in North America with a wingspan over 40 mm. Larvae build robust catch-nets in powerful mountain torrents.
Did You Know?
Larvae are partially predatory, consuming small invertebrates trapped in their nets alongside organic debris.