The call of P. guytonae consists of a series of short, 2–5 syllable echemes and is unique in the frequency modulated aspect of the echemes; mean syllable duration is 0.0047 s (SD=0.00182, n=57) (Figs. 53G, H). Within each echeme the first syllable starts with the dominant frequency of 12.24–16.99 kHz (mean 14.88 kHz) and each successive syllable progressively increases its dominant frequency by approximately 2 kHz, with the last syl- lable reaching 18.16–22.26 kHz (mean 20.0 kHz) (Fig. 55I). It is possible that the function of such frequency shift is similar to that discussed by Heller & Hemp (2017) for Gonatoxia helleri, which apparently serves to mimic the call of a female in order to make it more difficult to locate her for other conspecific males. Females of P. guytonae have well developed stridulatory files on the posterior margin of the right tegmen, which implies a call-and-response behavior in this species. Unfortunately, the female call is yet unknown. [1]
