Great Diving Beetle vs Predaceous Diving Beetle

The great diving beetle, Dytiscus marginalis, is a large aquatic beetle found in freshwater habitats across much of Europe and parts of northern Asia. Both adults and larvae are predators, feeding on aquatic invertebrates and occasionally small vertebrates such as tadpoles or fish. Adults carry air beneath their wing cases for underwater respiration and can fly between ponds, while their streamlin...

Predaceous diving beetles comprise the family Dytiscidae, a large group of aquatic insects with over 4,000 recognized species worldwide. Both adults and larvae are voracious predators, actively hunting other aquatic invertebrates, tadpoles, and small fish underwater. To breathe while submerged, adult beetles trap a bubble of air beneath their hardened wing covers, known as elytra. They inhabit a v...