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Characters on pictures support all B. panzer. From Schleswig-Holstein hundreds of specimens of this species are recorded, mostly bred from fresh stumps of Fagus and Acer (same habitat as Merz reported in his paper) while there is only a single, doubtful record of B. dorsata. B. panzer is generally associated with deciduous forests as it seems to be typical for the Schenefeld area while B. dorsata is living in coniferous forest. General distribution and habitat are speaking as well for B. panzer.
Xylo.