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The Mediterranean snakefly    Raphidia   mediterranea    H. Aspöck, U. Aspöck &amp; Rausch, 1977 – known from many parts of the Balkan Peninsula, several Aegean islands, southern parts of Italy, northwest of Anatolia and a few localities in Eastern Europe, yet not recorded in Central Europe – was surprisingly found with an astoundingly high population density on bushes in the yard of an old farmhouse at a comparatively high altitude (800 m) in Upper Austria, north of the Danube River, in 2013. This spectacular phenomenon was again observed in the following years (2014, 2015, 2016, 2017), and in 2016 the suspicion that the larvae develop in the straw of the thatched roof of the farmhouse could be confirmed by findings of larvae, pupae, and exuviae.It is most likely, that the occurrence of this    Raphidia    species in Austria is to be traced back to a human-caused introduction at some point in time. It remains, however, unknown when and specifically how this event might have occurred.Morphologically no substantial differences were found between specimens from Greece, Italy and Upper Austria. In addition, the genetic uniformity (using 3 genes:  cox1 ,  cox3 , and  28S ) of the populations was verified. This supports an earlier hypothesis that the occurrence of the species, as well as that of    R.   mediterranea    in Italy, Anatolia and perhaps elsewhere, may be related to importation of goods involving wood or soil.A molecular genetic analysis of several    Raphidia    species confirmed the present morphology-based concept of their systematic position.The means of dispersal of   Raphidioptera   are largely unknown. We do not know of any other similar cases of anthropogenic dispersal of a snakefly, but it cannot be excluded that human activities may have played a greater role in the dispersal of   Raphidioptera   than previously assumed. Phylogenomic studies would therefore be promising to solve some of these questions.

Anthropogenic dispersal of a snakefly ( Insecta , Neuropterida ) – a singular phenomenon or a model case in Raphidioptera ?