Japanese Diving Beetle vs Cabbage Stem Weevil
Side-by-side species comparison
| Attribute | Japanese Diving Beetle | Cabbage Stem Weevil |
|---|---|---|
| Scientific Name | Cybister japonicus | Ceutorhynchus pallidactylus |
| Order | Coleoptera | Coleoptera |
| Family | Dytiscidae | Curculionidae |
| Size | 30-38 mm | 2.5-3.5 mm |
| Habitat | Ponds & Lakes | Farmland |
| Diet | Omnivores | Herbivores |
| Regions | Japan, Korean Peninsula | Europe |
| Conservation | Vulnerable | Least Concern |
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.
Cabbage Stem Weevil
A grey weevil that mines inside brassica stems. Larvae tunnel through stems causing weakening. One of several Ceutorhynchus species affecting oilseed rape.
Did You Know?
Larval tunneling weakens plant stems to the point where they may snap in windy conditions.