Western Balsam Bark Beetle vs Twelve-Lined Whirligig Beetle

Side-by-side species comparison

Attribute	Western Balsam Bark Beetle	Twelve-Lined Whirligig Beetle
Scientific Name	Dryocoetes confusus	Gyrinus minutus
Order	Coleoptera	Coleoptera
Family	Curculionidae (Scolytinae)	Gyrinidae
Size	3.2–4.5 mm	3-4 mm
Habitat	Mountains	Ponds & Lakes
Diet	Wood Feeders	Omnivores
Regions	Western North America	Europe, Northern Asia
Conservation	Not Evaluated	Least Concern

Western Balsam Bark Beetle

A bark beetle that primarily attacks subalpine fir in western North America. It often colonizes trees already weakened by root disease.

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It produces a pheromone called exo-brevicomin that attracts other beetles to mass-attack weakened trees.

One of the smallest European whirligig beetles, found in clean ponds and lakes. It is often overlooked due to its diminutive size.

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Its flattened, oar-like hind legs beat up to 60 times per second to maintain its rapid surface swimming.