Heteragrion demarmelsi Stand-Pérez, Bota-Sierra & Pérez-Gutiérrez, 2019

(Figs. 29a–e)

[Key locator: Key to Group B species, couplet 28 (26)]

Heteragrion demarmelsi: Stand-Pérez et al. 2019: 90–112 (key to species, ♁ in couplet 9, ♀ in couplet 7’; description and diagnosis of specimens from Colombia; comparison with H. inca and H. chlorotaeniatum; figs. 5c–d, 9a–c, 14g –i, 16d–e, h–i, 18).

Material examined. 1♁ (HOLOTYPE) COLOMBIA, Amazonas Department, Leticia Municipality, Monifue Amena Center, Tacana River, 6.x.2005, (-4.0953, -69.9305, 71m asl), (Code MPUJ_ENT 0061372), MPUJ; 15♁♁ Amazona Department, Leticia Municipality, Monifue Amena Center, Tacana River, 6.x.2005, (-4.0952, -69.9305, 71m asl), MPUJ; 1♁ (PARATYPE) Amazonas Departament, Leticia Municipality, Km 11 Multi-ethnic Refuge Ticuna-Uitoto, Road to Zafire, Tacana River, (80m asl), A. Clavijo leg., CEUA .

Known distribution. Colombian Amazon.

Diagnosis and remarks. This newly described species was already assessed as Endangered by the IUCN Red List, as it “occurs in a small area threatened by urban and agricultural expansion” (Bota-Sierra & Sandoval 2021). Regarding its identity, it is close to H. inca, being separated by the lateral view of cercus and some head coloration patterns. The following character combination distinguishes this species from the remainder of Group B species: ridge above ML with a single row of teeth (Figs. 29c–d); male postclypeus yellow with brown transverse line (Fig. 29a); in dorsal view, cercus slightly elbowed along its midlength (Fig. 29e).