According to Rejzek and Rebl (1999) this very rare species develops in hollow trunks or thick branches of various living deciduous trees where there is a convenient substrate within the trunk. This substrate comprises a 1-5 cm thick layer of a dead and extremely tenacious red-brown wood, which is in close contact with the compact heart wood (Figure 1). The species is gregarious and consequently many larvae and pupae (Figures 2a and 2b) can usually be found in a convenient substrate, but this appears quite infrequently in Central Europe. This species is sometimes accompanied by another rare inhabitant of hollow trunks, Necydalis ulmi Chevrolat, 1838. In Central Europe, beech (Fagus sylvatica) is preferred, but finds from other tree species such as oak (Quercus spp.) or the common horse-chestnut (Aesculus hippocastanum) were recorded as well. The protection of this highly interesting species should include a very considerate treatment of old trees, especially the beech. It is only in old trees, that convenient hollows are created. In places where the beetle occurs, felling of old trees should be reduced to a minimum in order to give the species a chance to find convenient substrate. The occurrence of this species in any area indicates a very rich and preserved environment (Figure 3).
The depicted beetles were captured on wing in Valtice (South Moravia, Czech Republic) by M.Hoskovec.
MH & MR © August 22, 2007