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 Key to the species group of the genus Tegotettix 1A In frontal view, vertex V-shaped. Frontal costa above the bifurcation indistinct (extremely short). Lateral ocelli positioned between the compound eyes. Shoulders smooth and elegant................................. T. cristiferus species group 1B In frontal view, vertex truncated. Frontal costa above the bifurcation long. Lateral ocelli positioned lower, in the lower third or in the level of the lower margins of the compound eyes. Shoulders robust......................................... 2 2A Lateral ocelli positioned in the lower third of the compound eyes height. Femora with undulated margins. Shoulders without tubercles.................................................................... T. novaeguineae species group 2B Lateral ocelli in the level with the lower margins of the compound eyes. Femora with toothed margins. Shoulders with tubercles.......................................................................... T. armatus species group