Horned and spiky: Tegotettix derijei sp. n. (Orthoptera: Tetrigidae) is a peculiar new pygmy grasshopper species from Mindanao Author Patano, Romeo R. 0000-0001-5020-6048 Center for Biodiversity Research and Extension in Mindanao, Central Mindanao University, Musuan, Maramag, Bukidnon 8710, Philippines. & Department of Biology, College of Arts and Sciences, Central Mindanao University, 8710, Musuan Bukidnon, Philippines. romeonojrpatano @ gmail. com; https: // orcid. org / 0000 - 0001 - 5020 - 6048 romeonojrpatano@gmail.com Author Mohagan, Alma B. 0000-0001-5020-6048 Center for Biodiversity Research and Extension in Mindanao, Central Mindanao University, Musuan, Maramag, Bukidnon 8710, Philippines. & Department of Biology, College of Arts and Sciences, Central Mindanao University, 8710, Musuan Bukidnon, Philippines. romeonojrpatano @ gmail. com; https: // orcid. org / 0000 - 0001 - 5020 - 6048 romeonojrpatano@gmail.com Author Tumbrinck, Josef Auf der Hees, Wassenberg, D- 41849 Germany. Author Amoroso, Victor B. 0000-0001-5020-6048 Center for Biodiversity Research and Extension in Mindanao, Central Mindanao University, Musuan, Maramag, Bukidnon 8710, Philippines. & Department of Biology, College of Arts and Sciences, Central Mindanao University, 8710, Musuan Bukidnon, Philippines. romeonojrpatano @ gmail. com; https: // orcid. org / 0000 - 0001 - 5020 - 6048 romeonojrpatano@gmail.com Author Skejo, Josip 0000-0002-2554-4499 University of Zagreb, Faculty of Science, Department of Biology, Evolution Lab, Rooseveltov trg 6, HR. 10000 Zagreb. * corresponding author: skejo. josip @ gmail. com; https: // orcid. org / 0000 - 0002 - 2554 - 4499 skejo.josip@gmail.com text Zootaxa 2021 2021-02-19 4933 2 198 210 journal article 8057 10.11646/zootaxa.4933.2.2 14317ce1-fcb1-457a-8629-f79559f3cf3e 1175-5326 4550202 3999E2EF-32AF-4F6D-9BED-4A0DCE8B69D4 Tegotettix cristiferus species group Diagnosis . Fastigial horns of variable height, from low in T. sagittarius to extremely high in T. derijei sp. n . ( Figure 6A ). Lateral ocelli placed between the compound eyes. In frontal view, frontal costa extremely short before bifurcation, almost indistinct. Facial carinae after the bifurcation divergent and straight. Shoulders (humeral part of the pronotum) elegant. Prozona extremely short. Pronotum with projections only on median carina. Femora undulated or straight. Chitinous surfaces generally smooth. This groups of species is closely related to Xistra . FIGURE 1. The last record of Tegotettix armatus Hancock, 1913 is this female from Poring caught in 1996 (see text for more details). The specimen is identified by comparison with Günther (1937) drawing of T. armatus . A—lateral view, B—dorsal view, C—frontal view. Photo Josef Tumbrinck. Composition and distribution . This species group includes Tegotettix corniculatus ( Stål, 1877 ) (the Philippines : unknown locality), T. cristiferus ( Günther, 1935 ) (Borneo) , here described Tegotettix derijei sp. n . (the Philippines : Mindanao), and T. sagittarius ( Bolívar, 1887 ) . More new species await description within this species group ( Figures 3 and 4 ).