Physalaemus biligonigerus species group

Only one call type was recorded for this group. All species have calls composed of a single harmonic note. The fundamental frequency is usually around 500 Hz, except for P. riograndensis whose calls have a fundamental frequency at ca. 1000 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. The call envelope is considerably variable within the species of this group.