Insect
Tasgius melanarius
Tasgius melanariusTasgius melanarius is a formidable predatory rove beetle that prowls damp soil, leaf litter, and compost heaps in search of small invertebrates. When threatened, it raises its flexible abdomen upward in a scorpion-like defensive posture while opening its powerful mandibles to ward off potential predators. Native to the western Palearctic and introduced to North America, it plays a vital ecological role by controlling populations of agricultural pests, fly larvae, and terrestrial mollusks.
PredatoryNocturnalGround Dweller
—observations
—countries
—peak records
Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Diet & preyFly larvae, Small slugs, Earthworms
Predators
- Songbirds
- Toads
- Ground beetles
ThreatsIntensive agricultural pesticide use and severe ground-cover disturbance
HabitatsDeciduous woodlands, gardens, hedgerows, compost piles, and disturbed soils
Life span1–2 years
Classification
- FamilyStaphylinidae
- SpeciesTasgius melanarius
Range data is not available yet.
Interaction riskLow
- Low
- Moderate
- High
- Very high
- Why interaction risk is low
- Safe to observe at a normal distance; may curl its abdomen defensively when cornered.
Responsible observation
- Best Viewing Conditions: Search under decaying logs, flat stones, or inside compost piles on damp evenings.
- Handling Advice: Avoid picking up by hand, as its sturdy mandibles can deliver a harmless but noticeable pinch.
Prey (c) Bruce Marlin, some rights reserved (CC BY-SA) · cc-by-sa
Close Relative no rights reserved, uploaded by Thomas · cc0
Image unavailableSame Family
Help improve the field guideSomething wrong?
Checking your Fauna account…Report a name, category, or profile issue for review.