Taxonomy and bioacoustics of little-known Grylloidea crickets (Orthoptera, Ensifera) from Mindanao, Philippines Author Tan, Ming Kai Block 207 A, Woodleigh Link, Singapore 361207, Republic of Singapore Author Salvador, Jewel Anne G. Department of Biological Sciences, College of Science and Mathematics, Mindanao State University-Iligan Institute of Technology, Tibanga, Iligan City 9200, Philippines Author Sabang, Aira Mae M. Department of Biological Sciences, College of Science and Mathematics, Mindanao State University-Iligan Institute of Technology, Tibanga, Iligan City 9200, Philippines Author Bahoy, Daphne Cayle M. Department of Biological Sciences, College of Science and Mathematics, Mindanao State University-Iligan Institute of Technology, Tibanga, Iligan City 9200, Philippines Author Nuñeza, Olga Macas Department of Biological Sciences, College of Science and Mathematics, Mindanao State University-Iligan Institute of Technology, Tibanga, Iligan City 9200, Philippines Author Robillard, Tony Institut de Systématique, Evolution, Biodiversité (ISYEB), Muséum national d’Histoire naturelle, CNRS, SU, EPHE, UA, 57 rue Cuvier, CP 50, 75231 Paris Cedex 05, France. text Zootaxa 2023 2023-08-02 5323 3 301 348 http://dx.doi.org/10.11646/zootaxa.5323.3.1 journal article 60678 10.11646/zootaxa.5323.3.1 203fd346-faa1-4a2b-8a54-20d7e830c535 1175-5326 8209415 C022FD72-9C54-4A89-A880-3D99F52C8499 Falcerminthus parvus ( Baroga-Barbecho & Robillard, 2020 ) ( Figs 1–5 ) Lebinthus parvus Baroga-Barbecho et al. , 2020: 419 Falcerminthus parvus —Tan et al. , 2021: 1077 (new combination) Specimens examined. PHILIPPINES • 1♁; Mindanao , Misamis Oriental , Gingoog City , Barangay Lunotan , foot of Mt Balatukan ; 14 February 2023 ; coll. A.M. Sabang , A. Gono, D.C.M . Bahoy & K. Grumo ; MIN.23.39 ( ZRC ) Remarks. This species was first described in 2020 but the calling song was not known. The morphology and genitalia of our male specimen resemble that of the holotype ( Fig. 2 ). Ecology. We observed this species dwelling among foliage of ground-over plants and moss among dead log in open forest ( Figs 1 , 3 , 4 ). Type locality. PHILIPPINES , Mindanao Island , Misamis Oriental , Gingoog City , Barangay Lunotan Distribution. PHILIPPINES (Mindanao Island: Misamis Oriental , Bukidnon , Agusan del Sur ) Calling song (1J, 29.2±1.2°C) ( Fig. 5 ). The calling song consists of an echeme including an average of 77±11 discrete syllables (41–90 syllables). The first few (ca. 10) syllables tend to be of lower amplitudes and erratic in duration and intervals; amplitude of syllable gradually increases to a maximum and stabilises at one third of echeme duration. Each echeme has a duration of 1.08±0.13 s (0.61–1.25 s). The average syllable duration is 7.23±0.75 ms (5.60–8.50 ms) and average interval between consecutive syllables is 5.87±0.95 ms (3.90–7.60 ms). The frequency spectrum is pure-tonal and forms a harmonic, with the energy peaking at the fundamental frequency. The dominant frequency is 18.46±0.45 kHz (17.91–19.41 kHz).