Bioacoustics of Brachytrupes

The calling song of Brachytrupes bapaensis sp. nov. consisted of a loud continuous trill, which was heard and recorded several minutes without interruption ( Fig. 6 ). The carrier frequency band of the song has its peak near 4.3 kHz, and the syllable period is about 8.6 ms corresponding to a SRR of 115 Hz. In both parameters the song is thus similar to that known from other Brachytrupes species ( Table 3 ). The asiatic counterpart Tarbinskiellus portentosus , has also a similar song, but a lower SRR ( Table 3 ). The stridulatory file of this species carries much more teeth (81–85) ( Ahmad & Khan 2013 ) which are more densely packed (20 teeth/mm) ( Ahmad & Khan 2013 ; but density 9.4 teeth/mm in the middle of the file [ Godthi et al. 2022 ]) than in B. bapanensis sp. nov. . The calling song of Brachytrupes tropicus consisted of a loud, low-pitched continuous trill, which is emitted during several minutes without interruption. Pulse and interpulse durations are quite constant. The frequency band of the song ranged from 4.8 to 6.4 kHz with the peak near 5.7 kHz and a SRR of 118 Hz ( Table 3 , Desutter-Grandcolas 1998).