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Red-brown longhorn beetle

Stictoleptura rubra


Stictoleptura rubra can reach a length of 10 to 20 millimeters. This species has an evident sexual dimorphism, with variations in color and shape. Elytrae and pronotum of the females are uniformly reddish-brown or reddish-orange, while in males head and pronotum are black. Moreover the males have brown or pale ochre elytrae and often they are smaller and narrower than the females. Life cycle of this species lasts two - three years. Adults can be encountered from May to September, but mainly in July and August. They visit flowering plants for nectar and/or pollen, while larvae develop and feed within dead wood and tree stumps of coniferous trees. To develop and reach maturity they need nutrients provided by fungi. Theirs gut contains cellulase-producing yeasts to enable xylophagy, or wood-digestion.


Juveniles often found on various pines, firs and larches. Adults visit flowers for nectar and pollen.


Male red-brown longhorn beetle spotted in Radio Kootwijk, Veluwe, Holland. (sources: see reference)

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Spotted by

Radio Kootwijk, Gelderland, Netherlands

Spotted on Jul 19, 2020
Submitted on Sep 26, 2020

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