Heteragrion breweri De Marmels, 1989

(Figs. 17a–d)

[Key locator: Key to Group B species, couplet 6 (5’)]

Heteragrion breweri: De Marmels 1989: 17 (description of ♁ from Venezuela; comparison with H. icterops, H. romani, and H. simulatum; figs. 22–29);— De Marmels 1990: 335 (species recorded in Venezuela);— De Marmels 2004: 441 (description of ♀ and F0 larvae);— Garrison et al. 2010: 88 (list of Heteragrion species);— Pérez-Gutiérrez & Palacino-Rodríguez 2011: 209 (first record to Colombia);— Stand-Pérez et al. 2019: 93, 98–99 (key to species, ♁ in couplet 10, ♀ in couplet 9; remarks and comparison of ♀ with H. bariai; figs. 4i–j, 8d–f, 13d–f, 18);— Florez et al. 2023: 11 (recorded in San José del Guaviare, Colombia).

Material examined. 1♁ VENEZUELA, Bolívar, Los Pijiguaos, 4.xi.2004, (6.5666, -66.8166, 150 m asl), J. De Marmels leg., ABMM ; 1♁ Río Villacos, 6.xi.2004, (6.4166, -67.0166, 165m asl), J. DeMarmels leg., ABMM ; 1♁ COLOMBIA, Meta Department, San Martin Municipality, Rey Zamuro Reserve, 11.vi.2014, (3.5416, -73.3572, 265m asl), C. Moreno, leg., CEUA ; 1♁ Caquetá Department, Florencia Municipality, ANDES-E; 2♁♁ Meta Department, Puerto López Municipality, (4.0926, -72.9552), ANDES-E ; 1♁ Caño Cuduyari, (1.2917, -70.2556, 176m asl), M. Sánchez leg., ANDES-E ; 2♁♁ Guainía Department, Inírida Municipality, (3.8684, -67.9239), ANDES-E .

Known distribution. Orinoco basin and Northern Amazon of Colombia and Venezuela.

Diagnosis and remarks. Heteragrion breweri shares a high degree of morphological similarity with H. icterops and H. simulatum, with most of their characters except coloration being identical according to De Marmels (1989). In his description, De Marmels (1987) mentions head coloration as a way of separating these taxa. In fact, H. breweri presents larger yellow areas above the antennae contrasting with the blacker areas. Nevertheless, this species can be distinguished from the remainder of Group B species based on the following combination of characters: paraprocts medium sized, reaching 2/3 of cercus length (Fig. 17d); ridge above cercus ML long, sinuous, consisting of small teeth and a marked carina (Fig. 17c); in lateral view, ML bent downwards (Fig. 17d); AP the shortest, tip curved downwards (Fig. 17c).