Figure 1 in Songs, genetics, and morphology: revealing the taxonomic units in the European Cicadetta cerdaniensis cicada group, with a description of new taxa (Hemiptera: Cicadidae)

Figure 1. Timbal movement types in the Cicadetta cerdaniensis song group demonstrated in oscillograms (time versus amplitude): A, alternating type, with four signals per syllable; B, synchronous, with two signals per syllable visible (or one timbal not active/destroyed); and C, halfsynchronous, with three signals of variable amplitude visible. Grey bars indicate the duration of one syllable (complete group of buckling inwards and restoration for both timbals).