Taxonomic revision of the Neotropical genus Heteragrion Selys, 1862 (Zygoptera: Heteragrionidae): male morphology, new species and illustrated key Author Vilela, Diogo Silva 0000-0001-6510-7018 Laboratório de Biologia Aquática, Departamento de Ciências Biológicas, Faculdade de Ciências e Letras de Assis, Universidade Estadual Paulista, Assis, SP, Brazil deeogoo @ gmail. com; https: // orcid. org / 0000 - 0001 - 6510 - 7018 deeogoo@gmail.com Author Lencioni, Frederico A. A. 0000-0002-3912-9181 Rua Anibal, 216, Jardim Coleginho, CEP 12310 - 780, Jacareí, SP, Brazil lencioni. odonata @ gmail. com; https: // orcid. org / 0000 - 0002 - 3912 - 9181 lencioni.odonata@gmail.com Author Bota-Sierra, Cornelio A. 0000-0002-6555-7913 Grupo de Entomología Universidad de Antioquia (GEUA), Universidad de Antioquia, Medellin 50010, Colombia corneliobota @ gmail. com; https: // orcid. org / 0000 - 0002 - 6555 - 7913 corneliobota@gmail.com Author Ware, Jessica L. 0000-0002-4066-7681 Division of Invertebrate Zoology, American Museum of Natural History, USA jware @ amnh. org; https: // orcid. org / 0000 - 0002 - 4066 - 7681 jware@amnh.org Author Bispo, Pitágoras C. 0000-0001-6510-7018 Laboratório de Biologia Aquática, Departamento de Ciências Biológicas, Faculdade de Ciências e Letras de Assis, Universidade Estadual Paulista, Assis, SP, Brazil deeogoo @ gmail. com; https: // orcid. org / 0000 - 0001 - 6510 - 7018 & Laboratório de Biologia Aquática, Departamento de Ciências Biológicas, Faculdade de Ciências e Letras de Assis, Universidade Estadual Paulista, Assis, SP, Brazil deeogoo @ gmail. com; https: // orcid. org / 0000 - 0001 - 6510 - 7018 & pitagoras. bispo @ unesp. br; https: // orcid. org / 0000 - 0002 - 7356 - 8882 * Corresponding author deeogoo@gmail.com text Zootaxa 2023 2023-10-16 5356 1 1 96 http://dx.doi.org/10.11646/zootaxa.5356.1.1 journal article 273743 10.11646/zootaxa.5356.1.1 38e48899-447b-40cc-b9bd-e84bb0ac221e 1175-5334 10008529 F3CE1E00-45BB-44C8-8911-1A355BFD223C Heteragrion demarmelsi Stand-Pérez, Bota-Sierra & Pérez-Gutiérrez, 2019 ( Figs. 29a–e ) [Key locator: Key to Group B species, couplet 28 (26)] Heteragrion demarmelsi : Stand-Pérez et al. 2019: 90–112 (key to species, ♁ in couplet 9, ♀ in couplet 7’; description and diagnosis of specimens from Colombia ; comparison with H. inca and H. chlorotaeniatum ; figs. 5c–d, 9a–c, 14g –i, 16d–e, h–i, 18). FIGURE 29. Heteragrion demarmelsi : (a) anterior view of male head; (b) anterior view of female head; (c) mediodorsal view of cercus; (d) dorsal view of cercus; (e) lateral view of cercus; BP: basal portion; MP: medial portion; ML: medial lobe. Material examined. 1♁ ( HOLOTYPE ) COLOMBIA , Amazonas Department , Leticia Municipality , Monifue Amena Center , Tacana River , 6.x.2005 , ( -4.0953 , -69.9305 , 71m asl ), (Code MPUJ_ENT 0061372), MPUJ; 15♁♁ Amazona Department , Leticia Municipality , Monifue Amena Center , Tacana River , 6.x.2005 , ( -4.0952 , -69.9305 , 71m asl ), MPUJ; 1♁ ( PARATYPE ) Amazonas Departament , Leticia Municipality , Km 11 Multi-ethnic Refuge Ticuna-Uitoto , Road to Zafire , Tacana River , ( 80m asl ), A. Clavijo leg., CEUA . Known distribution. Colombian Amazon. Diagnosis and remarks. This newly described species was already assessed as Endangered by the IUCN Red List, as it “occurs in a small area threatened by urban and agricultural expansion” (Bota-Sierra & Sandoval 2021). Regarding its identity, it is close to H. inca , being separated by the lateral view of cercus and some head coloration patterns. The following character combination distinguishes this species from the remainder of Group B species: ridge above ML with a single row of teeth ( Figs. 29c–d ); male postclypeus yellow with brown transverse line ( Fig. 29a ); in dorsal view, cercus slightly elbowed along its midlength ( Fig. 29e ).