Heteragrion beschkii Hagen in Selys, 1862

(Figs. 15a–d)

[Key locator: Key to Group A species, couplet 16 (15)]

Heteragrion beschkii: Hagen in Selys 1862: 27–28 [25–26 reprint] (description and diagnosis of ♁ from Nova Friburgo, Brazil; comparison with H. aurantiacum and H. consors);— Selys 1886: 59 (species diagnosis);— Williamson 1919: 26 (key to species, ♁ in couplet d2; brief species diagnosis and illustration of ♁ head, appendages in mediodorsal and lateral views and prothorax; figs. 20, 82–83, 139);— Costa & Santos 2000: 4 (identification key);— Lencioni 2005: 128 (description and distribution, illustration of misidentified specimen);—Machado 2006: 1065 (comparison with H. gracile);— Garrison et al. 2010: 88 (list of Heteragrion species);— Lencioni 2013: 7 (synonymic list, type deposit, distribution, diagnosis; figs. 12, 32a–c, 32d, 73);—Ávila-Jr. et al. 2017: 284–285 (comparison with H. cauei);— Lencioni 2017: 131–132 (general taxonomic information; distribution; figs. 58–59).

Material examined. Known only from type material; examined through original description and lectotype images (type housed at MCZ) .

Known distribution. Brazil (Nova Friburgo, Rio de Janeiro state).

Diagnosis and remarks. This poorly known species can be separated from the remainder of Group A species by the following character combination: BP slightly hollow, densely hairy (Fig. 15c); ML ridge bearing strong teeth, reaching its apex (Fig. 15c); in lateral view, BP with a dorsobasal expansion (Fig. 15d); ML apex squared (Fig. 15c). The current conservation status of this species is uncertain, as it has only been recorded from a small number of specimens, with the most recent collection dating back over 30 years (Vilela & Guillermo-Ferreira 2021a). Therefore, further collections are needed to assess its present conservation status. The IUCN Red List has assigned it a Data Deficient (DD) status (Vilela & Guillermo-Ferreira 2021a).