Dasyscelus normalis Brunner von Wattenwyl, 1895

Fianco, Marcos, Szinwelski, Neucir & Faria, Luiz R. R., 2022, Katydids (Orthoptera: Tettigoniidae) from the Iguaçu National Park, Brazil, Zootaxa 5136 (1), pp. 1-72 : 56-58

Dasyscelus normalis Brunner von Wattenwyl, 1895

Fig. 29C, D ; 31A

Distribution: Argentina: Buenos Aires; Brazil: Paraná; Paraguay: Paraguarí.

New record for Brazil and for the Paraná State.

Comments: The collected specimens have an interesting colouration pattern, when alive they are greyish with some greenish areas or spots, and with ventral edge of abdomen light brown. They camouflage on mosses and lichens, where they can be found and collected.

Bioacoustics ( Fig. 30D–F ): Males produce echemes with small duration and quite constant amplitude. Each echeme is composed by 22 to 28 syllables with a moderate increasing of intensity during the sound production. A remarkable characteristic of the song of the species is that the dominant frequency changes along the stridulation: the dominant frequency is smaller at the beginning and at the end of the syllable than in the middle of the syllable, when the highest frequency is reached.

Dominant frequency: 19.6 ± 2.2 kHz.

Bandwidth: 6.9 ± 0.8 kHz.

Duration: Syllable: 0.3 ± 0.02 s.

Mute interval: Syllable: 14.2 ± 2.2 s.

Figures

FIGURE 29. Species of Pseudophyllinae from the ParNa Iguaçu. A and B: Brachyteleutias bilineattus, male and female, respectively; C and D: Dasyscelus normalis, male and female, respectively; E and F: Gongrocnemis (Melanocnemis) hilaris, male and female, respectively; G and H: Meroncidius flavolimbatus, male and female, respectively.

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.