Endecous onthophagus (Berg, 1891)

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 : 1573

Endecous onthophagus (Berg, 1891)

Calling song

A chirp with few repetitions. The signal consists of short phrases lasting 0.2 ± 0.013 (0.187 –0.219) seconds, with 8.25 ± 0.5 (8–9) syllables each. Each phrase has intervals of 0.657 ± 0.194 (0.484 –0.868) seconds and a peak frequency of 5.29 ± 0 (5.29–5.29) kHz.

Courtship song

A chirp with long intervals between phrases. The signal contains short phrases, lasting 0.132 ± 0.01 (0.119 –0.143) seconds, separated by intervals of 1.105 ± 0.48 (0.803–1.66) seconds. Each phrase consists of 5.75 ± 0.5 (5–6) syllables and a peak frequency of 4.86 ± 0.046 (4.82–4.9) kHz.

Aggressive song

Composed of chirps varying in duration according to the intensity of the interaction between males. Each phrase lasts 0.258 ± 0.017 (0.248 –0.279) seconds, with intervals of 1.803 ± 0.128 (1.712 –1.894) seconds. Each phrase contains 9 ± 1 (8–10) syllables with a peak frequency of 4.944 ± 0.361 (4.68–5.34) kHz.

Collection site

Morro Redondo, at Tunel Maciel. Males were collected from rock crevices at heights above 1 metre. Acoustic signal emissions start at 7 pm and continue throughout most of the night. Males were collected and recorded in January 2019 and 2020, at 5 PM, with a temperature of 23°C ( Figures 14A–C and 16D ) .

Remarks

Calling song previously described by Acosta et al. (2020) and Zefa et al. (2022b).

Figures

Figure 14. Songs of Phalangopsidae crickets. (A) Calling song of Endecous onthophagus (Berg, 1891). (B) Courtship song of Endecous onthophagus (Berg, 1891). (C) Aggressive song of Endecous onthophagus (Berg, 1891). (D) Calling song of Endecous sp. (E) Calling song of Lerneca inalata beripocone Lima, Martins and Lhano, 2016. (F) Courtship song of Lerneca inalata beripocone Lima, Martins and Lhano, 2016. (G) Courtship song of Adelosgryllus rubricephalus Mesa and Zefa, 2004.

Figure 16. Visual guide of Oecanthidae, Phalangopsidae and Trigonidiidae crickets of Pampa with songs recorded. (A) Oecanthus lineolatus Saussure, 1897. (B) Oecanthus sp. 1. (C) Oecanthus sp. 2. (D) Endecous onthophagus (Berg, 1891). (E) Lerneca inalata bericopene Lima, Martins and Lhano, 2016. (F) Anaxipha sp. 1. (G) Anaxipha sp. 3. (H) Cranistus colliurides Stål, 1861. (I) Phylloscyrtus amoenus Burmeister, 1880. Bar: 1cm. Photos A-D, F-H by Riuler Corrêa Acosta; Photo E by Lucas Augusto Kaminski; Photo I by Edison Zefa.