Heteragrion aequatoriale Selys, 1886

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 : 18-19

Heteragrion aequatoriale Selys, 1886

( Figs. 7a–h )

[Key locator Key to Group B species, couplet 29 (26’)] Heteragrion aequatoriale: Selys 1886: 63–64 (description of ♁ and ♀ Bogota (unlikely), Colombia);— Calvert 1909: 107–108 (first drawings of ♁ appendages, fig. 37; considerations about specimens collected in Peru; noting some color variations among his and Selys specimens);— Ris 1918: 85 (notices taxonomic variations in specimens collected in Peru);— Williamson 1919: 13, 35–36 (key to species, ♁ in couplet g3; drawings of ♁ and ♀ head figs. 44–45, drawing of ♁ right superior appendage figs. 93, 131; notices some inconsistencies on Selys’s original description with ♁♁ from Peru; notes on specimens studied by Calvert and drawn by Menger, fig. 131; remainder figs. 44, 45, 113, 132, 160, 161);— Paulson 1981: 303–304 (comparison of coloration patterns with other Heteragrion species);— Donnelly 1992: 58 (comparisons with H. rubrifulvum );— Garrison et al. 2010: 88–89 (list of Heteragrion species; figs. 372–373);— Bota-Sierra et al. 2016: 67–86 (misidentified as H. calendulum );— Bota-Sierra & Novelo-Gutiérrez 2017: 555–559 (key to species, ♁ in couplet 3, ♀ in couplet 2; taxonomic history of the species, variation among specimens; description of the ♀; figs. 3a–h, 4a, 5a, e, 6c–d);— Stand-Pérez et al. 2019: 92–93 (notes on localities found in Colombia, altitudinal range, type depository and IUCN category; key to species, ♁ in couplet 5, ♀ in couplet 2).

Material examined. 1♁ BRAZIL, Acre state, Sena Madureira, Resex Cazumbá-Iracema , 21.vii.2019, (-9.1348, -68.9494), V.R.S. Ferreira leg. , LABECO; 1♁ same date, but 17.viii.2019, R.C. Bastos leg. ; 1♁ same date, but 19.viii.2019, V.R.S. Ferreira leg.; 1♁ same date, but 25.viii.2019, V.R.S. Ferreira leg; 1♁ COLOMBIA, Cañón del Río Taibá , 27.vii.2016, (5.2271, -76.0828, 1530m asl), J. Sandoval & C. Bota [Sierra] leg., CEUA .

Known distribution. Brazil (Acre state), Colombia (western and central Andes), Ecuador and Peru.

Diagnosis and remarks. The syntype illustrations made by von Ellenrieder & Garrison (2007, Figs. 7e–h ), and the details provided to them by Daigle ( von Ellenrieder & Garrison 2007: 5–6) were helpful to a confident diagnosis of this species, which is morphologically close to H. mitratum and H. bariai . This species can be separated from the remainder of Group B species by the following character combination: BP with a nearly straight margin, bearing no swelling or convexity ( Figs. 7e–f ); MP the shortest portion of cercus ( Figs. 7e–f ); ridge above ML sinuous, bearing strong teeth, with a carina parallel to the ridge ( Figs. 7e–f ); junction of ridge-ML with a marked cleft ( Figs. 7g –h ); ML apex blunt ( Figs. 7g –h ). Here we report the first record of this species in Brazil.

Figures

FIGURE 7. Heteragrion aequatoriale: (a–d) anterior view of head, showing minimal variation in color pattern; (e) cercus in dorsal view, showing the proportions of basal portion (BP), medial portion (MP), and apical portion (AP); (f) cercus in mediodorsal view; (g–h) close up of MP, showing ridge above medial lobe (ML) and small cleft at junction of ridge-ML. Figures e–h provided by Rosser Garrison and Natalia von Ellenrieder.