Figure 2 from: Emmrich M, Vences M, Ernst R, Köhler J, Barej MF, Glaw F, Jansen M, Rödel M-O (2020) A guild classification system proposed for anuran advertisement calls. Zoosystematics and Evolution 96(2): 515-525. https://doi.org/10.3897/zse.96.38770

Figure 2 Key to anuran advertisement call guilds (compare text); each guild illustrated by schematic waveform and spectrogram.