Steirodon (Posidippus) dentiferum Walker, 1869

Fianco, Marcos, Szinwelski, Neucir & Faria, Luiz R. R., 2022, Katydids (Orthoptera: Tettigoniidae) from the Iguaçu National Park, Brazil, Zootaxa 5136 (1), pp. 1-72 : 53-54

Steirodon (Posidippus) dentiferum Walker, 1869

Fig. 25D, E ; 28D

Distribution: South America; Argentina: Misiones; Brazil: Paraná; Colombia: Valle del Cauca.

New record for Brazil and for the Paraná State.

Comments: This species was also rarely found after its description. As far as we know, this is only the fourth record of the species. Just as for the other species of the tribe previously presented, S. dentiferum also seems to be broadly distributed along forested areas of South America.

Bioacoustics ( Fig. 26G–I ): The stridulation is performed by males at night, when long sequences of syllables not forming echemes are produced. Similarly to sounds of C. citrifolium and S. dentiferoides , each syllable is formed by pulses that are very sparse in the beginning, then becoming more grouped after the first third of the syllable. These pulses are produced in a crescendo of intensity until the mid of stridulation, when the intensity stabilizes.

Dominant frequency: 10 ± 0.4 kHz.

Bandwidth: 6.3 ± 0.1 kHz.

Duration: Syllable: 0.05 ± 0.005 s.

Mute interval: Syllable: 4.1 ± 0.9 s.

Figures

FIGURE 25. Species of Steirodontini (Phaneropterinae) from the ParNa Iguaçu. A: Cnemidophyllum citrifolium, male; B and C: Steirodon dentiferoides, male and female, respectively; D and E: S. dentiferum, male and female, respectively; F and G: Stilpnochlora marginoides, male and female, respectively; H and I: S. nanna, male and female, respectively.

FIGURE 26. Calling songs of species of Steirodontini and of Enthephippion olivaceum. A–C: Cnemidophyllum citrifolium; D–F: Steirodon dentiferoides; G–I: S. dentiferum. A: sonogram of one echeme; B, E and H: sonogram of one syllable; D and G: sonogram of two isolated syllables; C, F and H: spectrogram of the respective syllable.

FIGURE 28. Live specimens of Scudderiini, Steirodontini and Entephippion olivaceum (Phaneropterinae) from the ParNa Iguaçu. A: Ceraia cornutoides; B: Theudoria melanocnemis; C: Vellea cruenta; D: Steirodon dentiferum; E: Stilpnochlora marginoides; F: E. olivaceum; A: photo by Leanna C. Macarini; B–F: photos by Marcos Fianco.