Brachyteleutias bilineatus (Rehn, 1913)

Fianco, Marcos, Szinwelski, Neucir & Faria, Luiz R. R., 2022, Katydids (Orthoptera: Tettigoniidae) from the Iguaçu National Park, Brazil, Zootaxa 5136 (1), pp. 1-72 : 58-59

Brachyteleutias bilineatus (Rehn, 1913)

Fig. 30G, H ; 31B

Distribution: Argentina: Misiones; Brazil: Paraná.

New record for Brazil and for the Paraná State.

Comments: The individuals are nocturnal, particularly abundant, easily found on branches and twigs of bushes and small trees of the forest understory.

Bioacoustics ( Fig. 30G–I ): The stridulation is performed only at night. The echemes are short, with ca. one second of duration, and composed by sequences of three to six diplosyllables, each one formed by two grouped syllables. The amplitude of the first syllable is distinctly lower than the amplitude of the second, which is emitted with an abrupt increasing of intensity.

Dominant frequency: 32.4 ± 2.9 kHz.

Bandwidth: 11.3 ± 8.4 kHz.

Duration: Syllable: 0.005 ± 0.002 s.

Mute interval: Syllable: 0.01 ± 0.001 s.

Figures

FIGURE 30. Calling songs of the species of Pseudophyllinae from the ParNa Iguaçu. A–C: Meroncidius flavolimbatus; D–F: Dasyscelus normalis; G–I: Brachyteleutias flavolimbatus. A: sonogram of one echeme (the “noise” before the echeme corresponds to drumming behaviour); B: sonogram of one echeme; C: spectrogram of one syllable; D: sonogram of three echemes; E: sonogram of one echeme; F: sonogram of two syllables, (note the change of dominant frequency along time); G: sonogram of one echeme; H and I: sonogram and spectrogram of two syllables, respectively.

FIGURE 31. Live specimens of Pseudophyllinae from the ParNa Iguaçu. A: Dasyscelus normalis; B: Brachyteleutias bilineattus; C: Gongrocnemis (Melanocnemis) hilaris; D: Meroncidius flavolimbatus; A–C: photos by Marcos Fianco; D: photo by Pedro. G.B. Souza-Dias.