Figure 13 from: Barej MF, Schmitz A, Penner J, Doumbia J, Sandberger-Loua L, Hirschfeld M, Brede C, Emmrich M, Kouamé NG, Hillers A, Gonwouo NL, Nopper J, Adeba PJ, Bangoura MA, Gage C, Anderson G, Rödel M-O (2015) Life in the spray zone – overlooked diversity in West African torrent-frogs (Anura, Odontobatrachidae, Odontobatrachus). Zoosystematics and Evolution 91(2): 115-149. https://doi.org/10.3897/zse.91.5127

Figure 13 - Spectrogram and oscillogram of two calls of Odontobatrachus arndti sp. n. from Nimba Mts., Guinea with a dominant frequency of app. 2800-3400 Hz, a fundamental frequency of app. 1400-1700 Hz and 22 notes showing decreasing pause duration between notes (a) and 5 notes with constant pauses between notes (b)