Arctic Weevil vs Japanese Diving Beetle
Side-by-side species comparison
| Attribute | Arctic Weevil | Japanese Diving Beetle |
|---|---|---|
| Scientific Name | Otiorhynchus arcticus | Cybister japonicus |
| Order | Coleoptera | Coleoptera |
| Family | Curculionidae | Dytiscidae |
| Size | 5-8 mm | 30-38 mm |
| Habitat | Tundra & Arctic | Ponds & Lakes |
| Diet | Root Feeders | Omnivores |
| Regions | Arctic Scandinavia, northern Russia, Svalbard, Iceland | Japan, Korean Peninsula |
| Conservation | Least Concern | Vulnerable |
Arctic Weevil
A small, dark, flightless weevil with a short broad snout and rough-textured elytra. Adults are nocturnal and hide under stones during the day. Larvae feed on plant roots in tundra soil.
Did You Know?
Being flightless, this weevil relies entirely on walking to disperse, which means isolated Arctic populations can be genetically distinct.
Japanese Diving Beetle
A large diving beetle native to Japan, once common but now increasingly rare. It has suffered severe declines due to habitat loss and invasive species.
Did You Know?
The American bullfrog, introduced to Japan, is a major predator of this beetle and a key driver of its decline.