Japanese Diving Beetle vs Excavated Rove Beetle
Side-by-side species comparison
| Attribute | Japanese Diving Beetle | Excavated Rove Beetle |
|---|---|---|
| Scientific Name | Cybister japonicus | Omalium excavatum |
| Order | Coleoptera | Coleoptera |
| Family | Dytiscidae | Staphylinidae |
| Size | 30-38 mm | 3-4 mm |
| Habitat | Ponds & Lakes | Gardens |
| Diet | Omnivores | Herbivores |
| Regions | Japan, Korean Peninsula | Europe, introduced to North America |
| 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.
Excavated Rove Beetle
A small, brownish omaline rove beetle with distinctive excavations on the pronotum. It frequents decaying vegetation and is particularly associated with compost heaps and grass clippings.
Did You Know?
This species thrives in the heat-generating centers of compost heaps, tolerating temperatures that would be lethal to many other insects.