Heteragrion angustipenne 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 : 21-22

Heteragrion angustipenne Selys, 1886

( Figs. 10a–g )

[Key locator: Key to Group B species, couplet 29’]

Heteragrion angustipenne: Selys 1886: 64–65 (description of ♁ and brief description of ♀, from “ Équateur ”, comparison with other species, states that the male resembles H. aequatoriale and the female that of H. aequatoriale and H. icterops );— Calvert 1909: 108 (examination of ♁ specimen from Peru, comparison with original description; figs. 42–43);—Sĵstedt 1918: 8 (comparison with H. speciosum );— Williamson 1919: 36 (key to species, ♁ in couplet g3; states that the last segments of male holotype were lost; points out inconsistencies with Selys description of the ♀; figs; 29, 109, 110, 158);— Kimmins 1970: 196 (assigns a lectotype, states that the last segments were glued back, poss. by McLachlan);— Paulson 1981: 303–304 (comparison of coloration patterns with other Heteragrion species);— Garrison et al. 2010: 88, 91 (list of Heteragrion species; figs. 385–386);— Vilela et al. 2019a: 188 , 192 (comparison with ♀ of H. icterops and H. bariai ; key to ♀, couplet 1);— Stand-Pérez et al. 2019: 92–96 (key to species, ♁ in couplet 5’, ♀ in couplet 4; reports first record for Colombia; full description of ♀, variation among examined specimens; comparison with H. peregrinum ; figs. 4c–d, 7d–f, 12d–f, 16f, j, 17).

Material examined. 1♁ BRAZIL, Rondônia state, Porto Velho, Caicala , 16.i.2014, A.L. Andrade & G. Nicácio leg., LABECO . 13♁♁ COLOMBIA, Putumayo Department, Mocoa Municipality, Quebrada Sangoyaco , (650m asl), L. Pérez, J, Montes & J. Villamil leg., UARC ; 3♁♁ Vereda Los Sauces (600m asl), Pérez & J. Montes leg., UARC ; 2♁♁ Serranía de los Churumbelos National Park , 26.i.2013, (1000m asl), UARC ; 1♁ Putumayo Department, Orito Municipality, near Nuevo Mundo , (0.6725, -77.0798, 950m asl), M. Vigano leg., CEUA ; 1♁ road to Nuevo Mundo island , 20.i.2017, (0.6613, -77.0767, 890m asl), M. Vigano, A. Corso, & O. Janni leg., CEUA .

Known distribution. Brazil (Amazonas and Rondônia states), Colombia (eastern Andean foothills), Ecuador, and Peru.

Diagnosis and remarks. As already highlighted by Selys (1886), Williamson (1919), and Stand-Pérez et al. (2019), Heteragrion angustipenne is very similar in morphology to H. aequatoriale , with which it shares the cleft on the ridge-ML junction and the ridge bearing two rows of strong teeth ( Figs. 7f–h ; Fig. 10f–h ). Apart from these similarities, H. angustipenne can be separated from the remainder of Group B species by the following character combination: BP only slightly convex ( Figs. 10d–g ); ridge above ML nearly straight, long, with an additional row of teeth below the main ridge, partially covering ML in dorsal and dorsolateral views ( Figs. 10d–g ); ML with acute apex ( Figs. 10d–g ); MP–AP junction with a marked cleft ( Fig. 10g ).

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.

FIGURE 10. Heteragrion angustipenne: (a, c) anterior view of male head; (b) female head; (d, f) dorsal view of cercus; (e, g) mediodorsal view of cercus; (c) adapted from Williamson (1919), based on a male examined by Calvert (1909). ML: medial lobe. Figures f–g provided by Rosser Garrison and Natalia von Ellenrieder.