Heteragrion inca Calvert, 1909

Vilela, Diogo Silva, Lencioni, Frederico A. A., Bota-Sierra, Cornelio A., Ware, Jessica L. & Bispo, Pitágoras C., 2023, Taxonomic revision of the Neotropical genus Heteragrion Selys, 1862 (Zygoptera: Heteragrionidae): male morphology, new species and illustrated key, Zootaxa 5356 (1), pp. 1-96 : 58-60

Heteragrion inca Calvert, 1909

( Figs. 41c , 42a–n )

[Key locator: Key to Group B species, couplet 28’]

Heteragrion inca: Calvert 1909: 108–111 (description of ♁ and ♀ from Peru; comparison with H. icterops ; plate III, fig. 38);— Williamson 1919: 10, 50 (key to species, couplet d1; taxonomic history and comparison with H. icterops );— Daigle 2005: 167–168 (comparison with H. bickorum );— Garrison et al. 2010: 88 (list of Heteragrion species);— von Ellenrieder & Garrison 2011: 40–46 (recorded in Tiputini, Ecuador);— Bota-Sierra et al. 2015: 256 (first record in Colombia);— Stand-Pérez et al. 2019: 107–108 (remarks; mentions taxonomic uncertainty and comparisons with H. icterops ; figs. 5i–j, 10a–c, 15a–c, 19).

Material examined. 4♁♁ ECUADOR, Tiputini Biodiversity Station, Querbrada Harpía , 4.xii.2012, (-0.6350, -76.1460, 217m asl), A.C. Rivera & M.S. Herrera leg., ECOEVO ; 4♁♁, 4♀♀ same data, but 5.xii.2012, ECOEVO ; 1♁, 1♀ same data, but 8.xii.2012, ECOEVO ; 3♁♁, 1♀ Sendero Harpía , 7.xii.2012, (-0.6284, -76.1457, 228m asl), A.C. Rivera & M.S. Herrera leg., ECOEVO ; 5♁♁ Napo, Jatún Sacha, Río Shinquipino , 31.x.2014, (-1.0777, -77.6105, 400m asl), I. Sanmartín-Villar leg., ECOEVO ; 2♁♁, 2♀♀ same data, but 3.xi.2014, A.C. Rivera leg., ECOEVO ; 1♁ BRAZIL, Rondônia state, Ariquemes, Fazenda Rancho Grande , 16-24.iii.1989, (-10.8333, -63.1166), S.W. Dunkle leg., ABMM ; 1♁ Acre state, Igarapé do Jenilson , 21.viii.2022, (-7.4878, -73.7185, 260m asl), G. Desidério leg., INPA ; 1♁ (wrongly assigned as TYPE) PERU, Pebas, Cod. 013388786, McLachlan leg. (1938?), NHMUK ; 1♀ (wrongly assigned as PARATYPE) Pebas , Cod. 012504988, McLachlan leg. (1938?), NHMUK ; 1♁ Chanchamayo, Cod. 013388788, Morton leg., NHMUK ; 1♁ “Equateur”, Cod. 013388789, (1800m asl), [F.C. Fraser Bequest], NHMUK ; 1♁ COLOMBIA, Putumayo Department, Orito Municipality, near Nuevo Mundo , 10.i.2017, (0.6725, -77.0798, 950m asl), M. Vigano, A. Corso & O. Janni leg., CEUA ; 1♁ Río Guámez , 22.i.2017, (0.6204, -77.0525, 630m asl), M. Vigano, A. Corso & O. Janni leg., CEUA ; 1♁ Puerto Leguízamo Municipality, Vereda La Tregua , 30.i.2017, (-0.1065, -74.3265, 180m asl), M. Vigano, A. Corso & O. Janni leg., CEUA ; 3♁♁ Amazonas Department, Leticia Municipality, ICN ; 1♁ Amazonas Department, Puerto Nariño Municipality, Natural Park, El Vergel Community, (-3.8594, -70.2047, 91m asl), Y. Cano leg., ANDES–E .

Known distribution. Amazonian regions of Bolivia, Brazil (states of Acre and Rondônia), Colombia, Ecuador and Peru.

Diagnosis and remarks. See the taxonomic discussion under H. icterops section. The following character combination distinguishes this species from the remainder of Group B species: ridge above ML forming a roughly rounded teeth arrangement between the two rows ( Figs. 42e–f ); in lateral view, cercus elbowing varying in intensity along its midlength ( Figs. 42k, m ); male postclypeus yellow with a black transversal line ( Figs. 42a, 42c ), or lacking a transversal line ( Fig. 42b ); distribution in Colombian Amazon, Ecuador, Peru, Brazil, and Bolivia.

Figures

FIGURE 41. Ventral view of male genital fossae, showing the accessory structures and secondary genitalia of: (a–b) Heteragrion icterops, and (c) H. inca.

FIGURE 42. Heteragrion inca: (a–c) anterior view of head; (d) lateral view of pterothorax; (e–f, h) mediodorsal view of cercus; (g, i) close up showing the two MP ridges above ML; (c) adapted from the drawing by Williamson (1919). MP: medial portion of cercus; ML: medial lobe. Figures h–i provided by Rosser Garrison and Natalia von Ellenrieder.