Western Grannom Caddis vs Weighted Casemaker
Side-by-side species comparison
| Attribute | Western Grannom Caddis | Weighted Casemaker |
|---|---|---|
| Scientific Name | Brachycentrus occidentalis | Goera pilosa |
| Order | Trichoptera | Trichoptera |
| Family | Brachycentridae | Goeridae |
| Size | 9-12 mm | 9-13 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Omnivores | Detritivores |
| Regions | Europe | Europe |
| 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.
Weighted Casemaker
A caddisfly that attaches heavy ballast stones to the sides of its case for stability. Larvae are found in fast-flowing stony streams.
Did You Know?
The ballast stones can weigh several times more than the larva itself, preventing displacement by floods.