Water Scavenger Beetle vs Knapweed Gall Weevil
Side-by-side species comparison
| Attribute | Water Scavenger Beetle | Knapweed Gall Weevil |
|---|---|---|
| Scientific Name | Hydrophilus piceus | Bangasternus fausti |
| Order | Coleoptera | Coleoptera |
| Family | Hydrophilidae | Curculionidae |
| Size | 34-48 mm | 4-6 mm |
| Habitat | Ponds & Lakes | Grasslands |
| Diet | Herbivores | Gall Makers |
| Regions | Europe, Asia | Europe, Central Asia |
| Conservation | Near Threatened | Least Concern |
Water Scavenger Beetle
One of the largest European water beetles, with a glossy black, boat-shaped body. Despite its name, it is largely herbivorous as an adult.
Did You Know?
It carries air under its body in a silvery film, giving it a shimmering appearance underwater.
Knapweed Gall Weevil
A weevil that induces galls in knapweed flower heads. Larvae develop inside the enlarged flower buds. Used in biological control of invasive knapweeds in North America.
Did You Know?
Released in North America as biocontrol for invasive spotted knapweed, which costs ranchers millions annually.