Ptychadena mutinondoensis Channing & Willems, 2018

Advertisement call. The calls were recorded on 14 January 2016 between 19h00 and 20h00, air temperature 24°C. Males were heard calling during daytime, linked to rainy conditions, and after dark. The description is based on the call of males visually confirmed to be of this species, near the locality where the holotype was collected. The call consists of an irregular fast series of clicks, and brief trills of five to seven pulses (Fig. 4). The pulse rate is approximately 35 s-1. The fundamental frequency is 1.1 kHz, with additional harmonics. The duration of the trills varies from 0.1–0.3 s. Analysis of 93 calls from five males showed that the number of pulses varied from 1 to 8 (mean 3.7), call duration varied from 13–288 ms (mean 100), and pulse rate varied from 10.5–58.1 s-1 (mean 29.2 s- 1, n=79). The emphasised frequency varied from 1033–3531 Hz, (mean 1738 Hz).

In contrast, the advertisement call of P. broadleyi (n=3) (Fig. 4) consists of longer loud trills of 9–24 (mean 17) pulses, with a call duration of 0.84–2.25 s (mean 1.6 s) and pulse rate 9.6–10.2 s-1 (mean 10 s-1). The emphasised frequency varies from 1205–3531 Hz (mean 2670 Hz). The calls of other species of grass frogs consist of trills and chuckle calls. [1]

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