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 ochraceum Hagen in Selys, 1862 Heteragrion ochraceum : Selys 1862: 22–23 (description of ♁ and ♀ from Rio de Janeiro state ; comparison of ♁ with H. beschkii ; Selys states that he did not see the male and could not perform a good comparison with other species);— Williamson 1919: 24–25 (suggests synonymy with H. cinnamomeum , also similarities with H. aurantiacum ; states that the tubercle mentioned by Selys in the ♀ head is absent);— Garrison et al. 2010: 88 (list of Heteragrion species);— Lencioni 2013: 4 (mentions taxonomic problems concerning this name). Material examined. None. Known distribution. Brazil (Nova Friburgo, Rio de Janeiro state ). Diagnosis and remarks. Regarding H. ochraceum , it was described by Selys (1862) based on the two sexes, including one male and two females (one of them teneral). According to Williamson (1919) , Hagen considered H. cinnamomeum to be a junior synonym of H. ochraceum , though not formalizing this proposition. Additionally, one can observe many similarities between the female assigned as H. ochraceum (depicted by Williamson 1919 , Plate IV fig. 19) and the female assigned as H. aurantiacum ( Lencioni 2013 , fig. 50b). The main problem is that the type specimens are now incomplete (the male is missing) and impossible to associate with any valid name ( von Ellenrieder & Garrison 2007 ). However, as we have not studied the types in person, for now we do not consider this name as nomen dubium . Currently, there is not enough taxonomic information on this species to formalize a proper diagnosis. See further discussion under H. cinnamomeum .