Physalaemus gracilis (Boulenger, 1883)

Hepp, Fábio & Pombal, José P., 2020, Review of bioacoustical traits in the genus Physalaemus Fitzinger, 1826 (Anura: Leptodactylidae: Leiuperinae), Zootaxa 4725 (1), pp. 1-106 : 80

Physalaemus gracilis species group

Only one call type was recorded for this group. All species have calls composed of a single harmonic note, with fundamental frequency around 500 Hz. All species have calls with S-shaped harmonics, resulting from a general downward FM with an up-downward FM segment in the beginning of the call. This pattern is less clear in P. lisei and P. jordanensis due to less defined initial FM in the former, and to discontinuity of harmonics as a result of pulse- PAM in the latter. Physalaemus jordanensis is the only species of the group with pulse-PAM and PFM in its call. The call envelope is considerably variable within the species of this group.