Zur Bioakustik und Phylogenie der Gattung Poecilimon (Orthoptera, Tettigoniidae, Phaneropterinae)

35 European bush cricket species of the genus Poecilimon are comapred with special reference to their stridulatory movements, recorded with an opto-electronic camera, analysed in oszillograms and some power spectra, and ot their stridulatory files, studied with an electrone microscope. Since in the bush crickets the acoustics play the prime role in pair finding and thus reproductive isolation, an anslysis based on sound production and additional morphological characetristics lends itself well to investigate the relationships and the status of the species within this group. From this certain reclassifications are proposed: 15 species have been synonymized with 7 of them classified as supspecies and one subspecies has been newly described as Poecilimon obesus artedentatus.

The evolution of striduylatory movements and songs id sicussed extensively (Fig. 27). It is implied that in the songs shortneing or lengthening or fast repition of elements are typical derived forms from the original pattern. The phylogenetic tree presented in Fig. 26 considers differences in teh above physiological characteristcs as well as certian morphological onesexpecially the expression of the prothoracal stigma, whether wide or of a slit shape, the form of the pronotum, whether flat or raised, the form of the cerci, whether smooth or toothed, and finally it considers also the characteristic form of the animals stridulatory file.