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 aequatoriale Selys, 1886 ( Figs. 7a–h ) [Key locator Key to Group B species, couplet 29 (26’)] Heteragrion aequatoriale : Selys 1886: 63–64 (description of ♁ and ♀ Bogota (unlikely), Colombia );— Calvert 1909: 107–108 (first drawings of ♁ appendages, fig. 37; considerations about specimens collected in Peru ; noting some color variations among his and Selys specimens);— Ris 1918: 85 (notices taxonomic variations in specimens collected in Peru );— Williamson 1919: 13 , 35–36 (key to species, ♁ in couplet g3; drawings of ♁ and ♀ head figs. 44–45, drawing of ♁ right superior appendage figs. 93, 131; notices some inconsistencies on Selys’s original description with ♁♁ from Peru ; notes on specimens studied by Calvert and drawn by Menger, fig. 131; remainder figs. 44, 45, 113, 132, 160, 161);— Paulson 1981: 303–304 (comparison of coloration patterns with other Heteragrion species );— Donnelly 1992: 58 (comparisons with H. rubrifulvum );— Garrison et al. 2010: 88–89 (list of Heteragrion species ; figs. 372–373);— Bota-Sierra et al. 2016: 67–86 (misidentified as H. calendulum );— Bota-Sierra & Novelo-Gutiérrez 2017: 555–559 (key to species, ♁ in couplet 3, ♀ in couplet 2; taxonomic history of the species, variation among specimens; description of the ♀ ; figs. 3a–h, 4a, 5a, e, 6c–d);— Stand-Pérez et al. 2019: 92–93 (notes on localities found in Colombia , altitudinal range, type depository and IUCN category; key to species, ♁ in couplet 5, ♀ in couplet 2). FIGURE 7. Heteragrion aequatoriale : (a–d) anterior view of head, showing minimal variation in color pattern; (e) cercus in dorsal view, showing the proportions of basal portion (BP), medial portion (MP), and apical portion (AP); (f) cercus in mediodorsal view; (g–h) close up of MP, showing ridge above medial lobe (ML) and small cleft at junction of ridge-ML. Figures e–h provided by Rosser Garrison and Natalia von Ellenrieder. Material examined. 1♁ BRAZIL , Acre state , Sena Madureira , Resex Cazumbá-Iracema , 21.vii.2019 , ( -9.1348 , -68.9494 ), V.R.S. Ferreira leg. , LABECO ; 1♁ same date, but 17.viii.2019 , R.C. Bastos leg. ; 1♁ same date, but 19.viii.2019 , V.R.S. Ferreira leg.; 1♁ same date, but 25.viii.2019 , V.R.S. Ferreira leg; 1♁ COLOMBIA , Cañón del Río Taibá , 27.vii.2016 , ( 5.2271 , -76.0828 , 1530m asl ), J. Sandoval & C. Bota [ Sierra ] leg., CEUA . Known distribution. Brazil ( Acre state ), Colombia (western and central Andes), Ecuador and Peru . Diagnosis and remarks . The syntype illustrations made by von Ellenrieder & Garrison (2007 , Figs. 7e–h ), and the details provided to them by Daigle ( von Ellenrieder & Garrison 2007: 5–6 ) were helpful to a confident diagnosis of this species, which is morphologically close to H. mitratum and H. bariai . This species can be separated from the remainder of Group B species by the following character combination: BP with a nearly straight margin, bearing no swelling or convexity ( Figs. 7e–f ); MP the shortest portion of cercus ( Figs. 7e–f ); ridge above ML sinuous, bearing strong teeth, with a carina parallel to the ridge ( Figs. 7e–f ); junction of ridge-ML with a marked cleft ( Figs. 7g –h ); ML apex blunt ( Figs. 7g –h ). Here we report the first record of this species in Brazil .