Guyalna viridifemur (Walker, 1850)

Acosta, Riuler C., Timm, Vítor F., Zefa, Edison, da Costa, Maria K. M., Ruschel, Tatiana P., Lopes, Dimitrius A. R. & Kaminski, Lucas A., 2025, Pampa singers: an acoustic and visual guide to singing insects (Orthoptera and Hemiptera), Journal of Natural History 59 (21 - 24), pp. 1541-1589 : 1550

Guyalna viridifemur (Walker, 1850)

Flying song

Not observed.

Calling song

Composed of two distinct sessions. The first consists of short echemmes, 11.8 ± 6.7 (4–22) in total, lasting about 0.11 ± 0.03 (0.07–0.16) each. Following each short echemme, there is an interval of 1.02 ± 0.8 (0.68–2.8) seconds. The second part comprises a long echemme, lasting approximately 6.16 ± 2.69 (4.9–12.26) seconds. The second part is emitted continuously by males as a chorus signalling. The signal presents frequencies distributed in broad-range frequencies of F1, F2, F3, and F4. The F1 is at 4.5 ± 0.08 (4.4–4.6) kHz, F2 at 6.61 ± 0.61 (5.8–7.3) kHz, F3 at 10 ± 0.89 (9.07–11.1) kHz, and F4 at 12.3 ± 1.52 (11.1– 14.3) kHz.

Strell call

A series of long-duration echemmes, but there is no defined rhythm as this signal depends on the organism’s stress level. The signal presents frequencies distributed in a broad-range frequencies of F1, F2, F3 and F4. F1 is at 4.04 ± 0.22 (3.8–4.2) kHz, F2 at 10.46 ± 0.2 (10.1–10.5) kHz, F3 at 13.31 ± 0.55 (12.2–13.9) kHz and F4 at 15.45 ± 0.9 (13.7– 16.6) kHz.

Collection site

Parque Estadual de Itapuã, and EstaÇão Ecológica do Taim. The cicada was collected and recorded at the forest edge, 1.5 metres above the ground, where it performs its chorus call, with temperatures between 24 and 32°C at 3 pm. Collections were made in January 2020 ( Figures 3 E-F and 5F).

Remarks

This is the first official publication of the species’ sound record. Considering the morphological similarities between G. viridifemur , G. cuta and G. nigra , we analysed the sonograms presented by Boulard (1999) for the two last mentioned species. It was possible to observe that the duration of the echeme and the broad-range frequency differ between these species.

Figures

Figure 3. Songs of Parnisini and Fidicinini cicadas. (A) Calling song of Parnisa sp. (B) Stress call of Parnisa sp. (C) Acanthoventris charrua Ruschel, 2023. (D) Guyalna bonaerensis (Berg, 1879). (E) Calling song of Guyalna viridifemur (Walker, 1850). (F) Stress call of Guyalna viridifemur (Walker, 1850). (G) Calling song of Pompanonia sp. (H) Stress call of Pompanonia sp. (I) Calling song of Proarna montevidensis.BERG, 1882. (J) Calling song of Proarna uruguayensis Berg, 1882