Heteragrion aurantiacum Selys, 1862

(Figs. 12a–j)

[Key locator: Key to Group A species, couplet 14’] Heteragrion aurantiacum: Selys 1862: 25 [23 reprint] (description of ♁ and ♀, from “Le Brésil ”);— Selys 1886: 60 (species diagnosis, H. amazonicum and H. cinnamomeum as synonym);— Calvert 1909: 114–115 (discussion, illustration of ♁ appendages in mediodorsal view; fig. 40);— Williamson 1919: 26–28 (key to species, ♁ in couplet d1, ♀ in couplet c1; species diagnosis and illustration of head of ♁ and ♀, ♁ appendages in mediodorsal and lateral views, ♁ and ♀ prothorax in dorsal view; figs. 21–22, 78–79, 111, 121–122, 141–142, 143–144);— Santos 1968: 13–15 (larval description, illustration of larval habitus, antennae, labium, ♀ S9–10;, figs. 1–4);— Santos 1970: 149 (recorded in Itatiaia, Rio de Janeiro state);— De Marmels 1987: 231 (color similarity with H. silvarum);— Costa & Santos 1999: 2 (comparison with larvae of H. consors);— Costa & Santos 2000: 4 (key);— Lencioni 2005: 126, Figs. 75a–c (description and distribution in Brazil, illustration of ♁ appendages in mediodorsal, dorsal and lateral views);—Machado 2006: 1065 (comparison with H. beschkii);— von Ellenrieder & Garrison 2007: 6 (mention and illustration of ♁ appendages);— Garrison et al. 2010: 88 (list of Heteragrion species);— Lencioni 2013: 3, 5–6 (synonymic list, diagnosis, comparison with other congeners; figs. 11a–b, 30a–c, 42a–c, 47a, 50a–b, 60–61, 68);— Souza et al. 2013: 1368 (recorded in Minas Gerais state);— Bedê et al. 2015: 121 (recorded to Serra de São José, Minas Gerais state);— Oliveira-Junior et al. 2015: 740 (list of species);— Lencioni 2017: 129–130 (general taxonomic information; distribution; figs. 56–57);— Storari et al. 2019: 488 (recorded in Espirito Santo state);— Vilela et al. 2021: 476–482 (morphological comparison with H. lencionii; figs. 1d–e, 2c–d);— Araújo & Pinto 2021: 6 (recorded for Paraná state);— Ribeiro et al. 2022: 275–279 (recorded in Bahia state; considered an abundant species);— Santos & Rodrigues 2022: 672 (Recorded in Bahia state; considered an indicator species).

Heteragrion amazonicum: Selys 1886: 60 (states that due to the similarities with H. aurantiacum, he refrains from describing H. amazonicum as a new species);— Williamson 1919: 29 (statements about Selys’s comment).

Material examined. 9♁♁ BRAZIL, Sergipe state, Serra de Itabaiana National Park, Ponto 3, 4.xii.2020, (- 10.7544, -37.3421), A.B. Farias & A.E. Santos leg., UFS ; 42♁♁ Riacho Água Fria, 1.xii.2020, (-10.9230, -37.0993), leg., UFS ; 35♁♁ Serra de Itabaiana National Park, Ponto 1, 7.xii.2020, (-11.3900, -37.4125), A.B. Farias & A.E. Santos leg., UFS ; 9♁♁ Serra de Itabaiana National Park, Ponto 5, 13.xii.2020, (-10.7475, -37.3408), A.B. Farias & J.C. Santos leg., UFS ; 23♁♁ Serra de Itabaiana National Park, Ponto 2 (Well), 7.xii.2020, (-10.7466, -37.3425), A.B. Farias & J.C. Santos leg., UFS ; 21♁♁ Serra de Itabaiana National Park, Ponto 3 (Above the well), 7.xii.2020, (-10.7541, -37.3419), A.B. Farias & A.E. Santos leg., UFS ; 28♁♁ Serra de Itabaiana National Park, Riacho Poço das Moças, 7.xii.2020, (-10.7469, -37.3416), A.B. Farias & A.E. Santos leg., UFS ; 16♁♁ Serra de Itabaiana National Park, Ponto 2 (Riacho Coqueiro), 7.xii.2020, (-10.7466, -37.3425), A.B. Farias & A.E. Santos leg., UFS ; 5♁♁ same locality, but 1.ii.2021, A.B. Farias & A.E. Santos leg., UFS; 16♁♁ Serra de Itabaiana National Park, Ponto 4, 7.xii.2020, (-10.7668, -37.3394), A.B. Farias & A.E. Santos leg., UFS ; 4♁♁ Serra de Itabaiana National Park ( No specific locality), 7.xii.2020, A.B. Farias & A.E. Santos leg., UFS ; 3♁♁ Mata do Junco, Ponto 3 (Mata Burra), 14.xii.2020, (-10.5425, -37.0512), A.B. Farias & B. Santos leg., UFS ; 5♁♁ Mata do Junco, Ponto 4, 14.xii.2020, (-10.5377, -37.0588), A.B. Farias & J.C. Santos leg., UFS ; 1♁ Paraná state, Cascavel, Juvinópolis, 1.iii.2015, (- 25.9675, -53.3646), M.E. Rodrigues leg., UESC ; 2♁♁ Bahia state, Ilhéus, Fazenda São Francisco, 14.x.2019, (- 14.3444, -39.1392), M.E. Rodrigues leg., UESC ; 3♁♁ Uruçuca, Serra Grande, 21.ix.2019, (-14.4402, -39.0398), M.E. Rodrigues leg., UESC ; 2♁♁ Porto Seguro, Veracel, 4.ix.2018, (-16.2950, -39.1394) .

Synonyms. H. amazonicum (Williamson 1919; Garrison & von Ellenrieder 2019).

Known distribution. Argentina, Brazil (states of Bahia, Espírito Santo, Minas Gerais, Paraná, São Paulo, Sergipe, Rio de Janeiro), Paraguay and Venezuela.

Diagnosis and remarks. Von Ellenrieder & Garrison (2007) illustrated and confirmed the identity of this species, by examining the syntype housed at RBINS (Fig. 12f courtesy of Jérôme Constant). See further discussion under H. cinnamomeum about the synonymy problem with H. ochraceum . This species can be separated from the remainder of Group A species by the following character combination: BP not the longest section, ventral concavity only slightly dilated; in MP, the medial lobe (ML) consisting of a single plate with a medial carina, reaching ML apex; ML bearing several teeth on its base (Fig. 12f); ML apex varying in width from narrow to wide but ending in a bilobate apex (Figs. 12f–j).