Thin-neck Cave Beetle vs Icelandic Water Beetle
Side-by-side species comparison
| Attribute | Thin-neck Cave Beetle | Icelandic Water Beetle |
|---|---|---|
| Scientific Name | Pseudanophthalmus parvicollis | Agabus bipustulatus |
| Order | Coleoptera | Coleoptera |
| Family | Carabidae | Dytiscidae |
| Size | 4-5 mm | 9-12 mm |
| Habitat | Caves | Tundra & Arctic |
| Diet | Detritivores | Predators |
| Regions | United States | Iceland, Scandinavia, northern Russia, subarctic Europe, Arctic Canada |
| Conservation | Endangered | Least Concern |
Thin-neck Cave Beetle
A narrowly endemic cave beetle with a distinctively slender pronotum. It inhabits caves in the Appalachian karst region.
Did You Know?
Its narrow neck (pronotum) helps it squeeze through tiny fissures in cave rock.
Icelandic Water Beetle
A medium-sized, oval, dark brown diving beetle found in cold ponds and lakes. It carries a silvery air bubble under its elytra for breathing underwater. Adults are strong fliers and can colonize isolated Arctic ponds.
Did You Know?
This beetle is one of the most widespread diving beetles in the Arctic and can fly long distances to colonize new ponds created by permafrost thaw.