Sharp-Grooved Diving Beetle vs Formosa Long-armed Scarab
Side-by-side species comparison
| Attribute | Sharp-Grooved Diving Beetle | Formosa Long-armed Scarab |
|---|---|---|
| Scientific Name | Acilius sulcatus | Cheirotonus formosanus |
| Order | Coleoptera | Coleoptera |
| Family | Dytiscidae | Euchirinae |
| Size | 15-18 mm | 40-60 mm |
| Habitat | Ponds & Lakes | Forests |
| Diet | Predators | Sap Feeders |
| Regions | Europe, Western Asia | Taiwan |
| Conservation | Least Concern | Endangered |
Sharp-Grooved Diving Beetle
A medium-sized diving beetle widespread across Europe, recognized by the deeply grooved elytra of females. It is a fast and agile predator in ponds.
Did You Know?
Females have deeply furrowed elytra that prevent males from gripping them, giving them control over mating.
Formosa Long-armed Scarab
A rare Taiwanese scarab with elongated forelimbs and a dark chestnut-brown body. It is found only in old-growth mountain forests on the island.
Did You Know?
Illegal collecting for the pet trade has made this one of the most threatened beetles in East Asia.