Engonia minor Brunner von Wattenwyl, 1878

Fig. 10G, H; 15D

Distribution: Argentina: Buenos Aires; Brazil: Minas Gerais, Paraná.

New record for the Paraná State.

Comments: Individuals are nocturnal, always sampled under the vegetation of understory, in bushes and shrubs. Males stridulate there, being easily found together with conspecific females. The species is relatively abundant inside the forest where is notable during aural observation.

Bioacoustics (Fig. 12A–D): The calling song is composed by a complex grouping of six to ten echemes. Each echeme begins with a crescendo intensity and closes with decrescendo intensity, being composed by 30 to 40 syllables. Each syllable is composed by three to five pulses, each one with smaller intensity than the anterior.

Dominant frequency: 11.4 ± 0.9 kHz.

Bandwidth: 7.4 ± 2.3 kHz.

Duration: Pulse: 0.002 ± 0.0008 s; Syllable: 0.018 ± 0.003 s; Echeme: 4.3 ± 0.8 s; sequency of echemes: 42.3 ± 3.4 s.

Mute interval: Pulse: 0.003 ± 0.001 s; Syllable: 0.08 ± 0.04 s; Echeme: 0.35 ± 0.17 s; Echeme sequence: 482 ± 125 s.