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T. tenebricosa measures 1–18 mm in length, is blue-black in colour and is both larger and more constricted on the base of its pronotum than the visually similar T. goettingensis (the lesser bloody-nosed beetle). The body is strongly curved and elytra smooth and finely punctuated. Its antennae are thick and well segmented, its legs have long tarsi and terminate with a double hook.
Crossing a coastal path in Devon, England