Whirligig Beetle

Scientific Name: Dineutus discolor

Order & Family: Coleoptera: Gyrinidae

Size: 10 to 15 mm

Whirligig Beetle

Natural Habitat

Freshwater ponds, lakes, and slow-moving streams, often found on the surface or near the water's edge

Diet & Feeding

Mainly eats small insects and other invertebrates that fall onto the water's surface; can also scavenge on dead material

Behavior Patterns

Known for their rapid, circular swimming movements on the water surface and can dive underwater when threatened. They often form large groups and have divided eyes for seeing both above and below the water simultaneously.

Risks & Benefits

Beneficial to ecosystems as they help control insect populations and serve as a food source for fish and other wildlife; they are generally harmless to humans but may produce a defensive, foul-smelling secretion if handled.

Identified on: 5/15/2026