Eutryxalis filata (Walker, 1870)

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 : 1556-1557

Eutryxalis filata (Walker, 1870)

Calling song

Composed of a series of phrases lasting 0.30 ± 0.03 (0.22–0.36) seconds, each containing 10.38 ± 1.55 (8–13) syllables spaced at intervals of 0.82 ± 0.41 (0.47–1.65) seconds. It presents a peak frequency of 11.4 ± 0.8 (10.12–12.65) kHz and a bandwidth of 7.47 ± 1.22 (5.7–8.81) kHz.

Alert song

Phrase lasting 0.07 ± 0.0007 (0.07–0.071) seconds, composed of 5 ± 0 (5–5) syllables. It presents a peak frequency of 9.42 ± 0.59 (9–9.84) kHz and a bandwidth of 8.859 ± 1.39 (7.87–9.84) kHz.

Collection site

Parque Estadual de Itapuã. Males produce signals between 8 am and 2 pm in edge habitats and open fields. The males emitted a startle jump preceding the alert sound emission. Males were recorded and collected in February 2023, between 9 and 10 am, at a temperature of 25°C ( Figures 6A and 7A ).

Remarks

This is the first official publication of the species’ sound record.

Figures

Figure 6. Song of grasshoppers. (A). Calling song of Eutryxalis filata (Walker, 1870). (B). Calling song of Euplectrotettix schulzi Bruner, 1900. (C). Alert song of Euplectrotettix schulzi Bruner, 1900. (D). Calling song of Sinipta dalmani (Stål, 1861). (E) Calling song of Xyleus discoideus discoideus (Serville, 1831). (F) Courtship song of Xyleus discoideus discoideus (Serville, 1831). (G) Calling song of Chromacris speciosa (Thunberg, 1824).

Figure 7. Visual guide of Pampa grasshoppers with songs recorded. (A) Eutryxalis filata (Walker, 1870). (B) Euplectrotettix ferrugineus Brunner, 1900. (C) Xyleus discoideus discoideus (Serville, 1831). (D) Chromacris speciosa (Thunberg, 1824). Bar: 1cm. Photos by Riuler Corrêa Acosta.