Heteragrion bickorum Daigle, 2005

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 : 29-30

Heteragrion bickorum Daigle, 2005

( Figs. 16a–g )

[Key locator: Key to Group B species, couplet 17’]

Heteragrion bickorum: Daigle 2005: 165–168 (description of ♁ and ♀ from Ecuador; comparison with H. bariai and H. inca ; figs. 1–5);— Garrison et al. 2010: 88 (list of Heteragrion species);— von Ellenrieder & Garrison 2011: 40 (list of species for Tiputini, Ecuador); Bota-Sierra et al. 2018: 120 (new record for Colombia);— Stand-Pérez et al. 2019: 92–93 , 97–98 (key to species, ♁ in couplet 7, ♀ in couplet 7; remarks and comparison with H. inca and H. demarmelsi ; figs. 4g –h, 8a–c, 13a–c, 17);— Stand-Pérez et al. 2020: 381 (list of species recorded in Serranía de Chiribiquete National Natural Park, Colombia);—Miranda-Filho et al. 2022: 9 (list of species occurring in Acre state, Brazil).

Material examined. 3♁♁ ECUADOR, Tiputini Biodiversity Station , 7.xii.2012, (-0.6321, -76.1451, 240m asl), A.C. Rivera leg., ECOEVO ; 6♁♁ Napo, Jatún Sacha , 11.xi.2014, (-1.0769, -77.6086, 437m asl), I. Sanmartín-Villar leg., ECOEVO ; 1♁ BRAZIL, Acre state, Igarapé do Véu , 18.vii.2022, (-7.4589, -73.6327, 220m asl), G. Desidério leg., INPA ; 2♁♁ same data, but 19.vii.2022; 4♁♁ same data, but 25.vii.2022; 5♁♁ COLOMBIA, Putumayo Department, Mocoa Municipality, Quebrada Sangoyaco , (650m asl), L. Pérez, J, Montes & J. Villamil leg., UARC ; 1♁ Putumayo Department, Orito Municipality, Isla Escondida Natural Reserve , 17.i.2017, (0.657, -77.0722, 850m asl), M. Vigano, A. Corso & O. Janni leg., CEUA ; 5♁♁ road to Nuevo Mundo island , 18 January 2017, (0.6613, -77.0767, 890m asl), M. Vigano, A. Corso & O. Janni leg., CEUA ; 1♁ Caquetá Department, Florencia Municipality, ANDES–E.

Known distribution. Brazil (Acre state), Colombia (Eastern Andean foothills), and Ecuador.

Diagnosis and remarks. Some degree of morphological variation was observed in the material from Ecuador, Colombia, and Brazil. Whereas specimens from Ecuador and Colombia presented a certain degree of BP convexity, the Brazilian specimens have this structure nearly straight or poorly convex. The remaining structures of the cercus (i.e., the crest, ML with acute tip) and overall coloration match the description of H. bickorum ; therefore, they were considered conspecific. This species, which shares morphological similarities with H. bariai , H. demarmelsi , and H. inca , can be distinguished from these and other Group B species based on the following combination of characters: BP nearly straight or only slightly convex; AP longer than MP ( Fig. 16g ); MP bearing an elevated crest on its medial margin ( Figs. 16d–e ); ML small, with acute apex ( Fig. 16e ); AP with a longitudinal depression ( Fig. 16d ).

Figures

FIGURE 16. Heteragrion bickorum: (a–b) anterior view of head; (c) lateral view of pterothorax; (d) mediodorsal view of cercus; (e) close up of MP-AP in medial view, showing the elevated crest and the ridge above ML; (f) medial view of cercus; (g) dorsal view of cercus.