New data on the calling songs of Gymnogryllus and Macrogryllus (Grylloidea, Gryllinae) from Sabah

We recorded the calling songs of two species of Macrogryllus Saussure, 1877 and four taxa of Gymnogryllus Saussure, 1877 from different parts of Sabah in Borneo, namely Mount Trus Madi, Maliau Basin and Meligan. The calling songs all consisted of a continuous trill. We found that the calling songs of the two genera exhibit clear differences in the dominant frequency, whereas each taxon also exhibits clear signature in the temporal domain of the calling songs, specifically the syllable duration, syllable interval and syllable period. The calling song of the genus Macrogryllus is described for the first time, and specifically the calling songs of Macrogryllus canorus Gorochov, 2022 and Macrogryllus ephippium (Saussure, 1877). Taxonomic remarks, including on the morphology, are also presented for the studied taxa.