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 10.11646/zootaxa.5323.3.1 1175-5326 8209415 C022FD72-9C54-4A89-A880-3D99F52C8499 Pentacentrus philippinensis Chopard, 1925 ( Figs 10 , 11 ) Pentacentrus philippinensis Chopard, 1925: 309 — Chopard, 1968: 257 Specimen examined. Holotype : PHILIPPINES • ♁; Mindanao , Davao ; MNHN-EO-ENSIF5041 New specimen examined. PHILIPPINES • 1♁; Mindanao , Misamis Oriental , Gingoog City , Barangay Lunotan , foot of Mt Balatukan ; N8.70601 , E125.00623 , 1213.0±6.0 m.a.s.l.; 15 February 2023 , 19h44; open area outside mossy forest, on a shrub leaf; coll. M.K. Tan , J.A.G. Salvador, A.M . Sabang, A . Gono, D.C.M . Bahoy & K. Grumo ; MIN.23.51 ( ZRC ) ( Figs 10 , 11 ) FIGURE 10. Pentacentrus philippinensis male in its natural environment, open forested area at the foot of Mt Balatukan. FIGURE 11. Pentacentrus philippinensis : dorsal (A) and lateral (B) habitus; head and pronotum in dorsal view (C); head, pronotum in lateral (D) view; FWs in dorsal view (E); ♁ genitalia in dorsal (F), ventral (G) and lateral (H) views. Scale bars: 5 mm (A, B), 2 mm (E), 1 mm (C, D, F–H). Remarks. The specimen we collected from Barangay Lunotan at the foot of Mt Balatukan represents the second published record of this species. Our specimen resembles in the colour patterns of the Pentacentrus philippinensis male holotype (MNHN-EO-ENSIF5041) from Davao (also on Mindanao Island). Here, we also describe the male genitalia for the first time. This species remains the only known species of Pentacentrus from the Philippines . However, at Barangay Lunotan, we also observed another species of Pentacentrus but we did not manage to collect the specimen ( Fig 12 ). FIGURE 12. Uncollected Pentacentrus in its natural environment, open forested area at the foot of Mt Balatukan. Description of male genitalia. Male genitalia as shown in Figs 11F–H : Pseudepiphallus [epiphallus] stout, middle of posterior end deeply and roundly emarginated; lateral of the emargination lobular with obtuse apex. Ventro-external of the latero-posterior lobules produced into two slender and elongated pseudepiphallic lophi [posterolateral epiphallic lobe]. In dorsal view, lophi with obliquely-rounded apices; in profile view, lophi pointing dorsad. Posterior margin, including lateral lobule and medial emargination, with a few (sparsely spaced) long setae; pseudepiphallic lophi with apices having a few closely packed stout setae. Pseudepiphallic paramere [ectoparamere] large and strongly sclerotized; externally with process long, slender and laterally-compressed and pointing dorsad; apex nearly reaching apex of pseudepiphallic lophi, with a few stout, closely packed setae; internally with stouter process, posterior end in profile view obtuse and pointing posteriorly and ventral margin granular, in ventral view slender. Ectophallic fold [rachis] strongly sclerotized, pointing dorsad, blade-like, tapering into acute apex. Ectophallic apodeme [endoparameral apodeme] in profile view broad, with anterior end truncated and forming hook-liked lobule. Endophallic sclerite [formula] very small, posterior end tapering into long acute apex. Ecology. The male was collected along forest edge of mossy forest and was found dwelling among foliage. Type locality. PHILIPPINES , Mindanao Island , Davao Distribution. PHILIPPINES (Mindanao Island: Davao , Misamis Oriental ) Calling song. This species is mute.