Eurycorypha annexata, Hemp, 2017

Heller, Klaus-Gerhard & Hemp, Claudia, 2020, Hyperdiverse songs, duetting, and the roles of intra- and intersexual selection in the acoustic communication of the genus Eurycorypha (Orthoptera: Tettigonioidea, Phaneropterinae), Organisms Diversity & Evolution (New York, N. Y.) 20 (4), pp. 597-617 : 600

Eurycorypha annexata ( Figs. 3 , 4a , and 5 )

In the calling song, two different types of echemes were observed ( Fig. 4a ). The first consisted of homogeneous groups of six to eight (6 ± 1; n = 19) syllables produced at a period of 61 ± 5 ms (n = 14). Often two groups followed each other at periods of 3 ± 0.7 s (n = 16), while the inter-group intervals were distinctly larger (10–40 s). The second type ( Fig. 6 ) was heard more rarely and interspersed between the first type (intervals before and after several seconds). Here, a group of about 14–16 syllables with decreasing syllable periods (from 58 to 41 ms; n = 9) was followed by one long syllable after an interval of 170 ± 36 ms (n = 9). The males from Zanzibar had a shorter first part (8–12 syllables) and added a few impulse-like sounds after the long syllable (50–200 ms after its end) .

Figures

Fig. 3 Power spectra of male calling song of Eurycorypha species. In species with restricted frequency range, short black lines mark its end. Blue lines indicate power spectra of female responses

Fig. 4 a, b Oscillograms of male calling songs, overview (10 s sections)

Fig. 5 Oscillograms of male calling songs, details (1.5 s sections)

Fig. 6 Oscillograms of male- female duets, overview (10 s sections)