Heteragrion mitratum Williamson, 1919

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 : 68-70

Heteragrion mitratum Williamson, 1919

( Figs. 50a–e )

[Key locator: Key to Group B species, couplet 27’]

Heteragrion mitratum: Williamson 1919: 39–47 (key to species, ♁ in couplet g1, ♀ in couplet c1; description and diagnosis of ♁ and ♀ from Colombia; comparison to H. aequatoriale by Ris; figs. 3–4, 50–51, 56, 63, 69, 95, 162–163);— De Marmels 1990: 335 (species recorded in Venezuela);— Ramírez 1992: 361 (species recorded in Costa Rica);— De Marmels 2004: 446 (brief larval description; figs. 28, 33, 41a, 43–44);— Garrison et al. 2010: 88 (list of Heteragrion species);— Bota-Sierra & Novelo-Gutiérrez 2017: 555, 564–567 (key to species, ♁ in couplet 6, ♀ in couplet 4; remarks and distribution in Colombia; figs. 2, 4l–m, 7a–b);— Stand-Pérez et al. 2019: 92–93 (key to species, ♁ in couplet 13, ♀ in couplet 11’; comparison with congeners; figs. 6a–b, 10g –i, 15d–f, 19).

Heteragrion mitratum atroterminatum: Donnelly 1992: 59–60 (description and diagnosis of ♁; figs. 5.1, 5.5, 5.9, 5.14);— Garrison et al. 2010: 88 (list of Heteragrion species);— Garrison & von Ellenrieder 2013: 14, 23 (list of species from Costa Rica; fig. 19, misspelled as “ H. m. atrolineatum ”);— Molinar et al. 2015: 87 (list of species from Panama);— Bota-Sierra & Novelo-Gutiérrez 2017: 555–556 , 567 (key to species, ♁ in couplet 6’; remarks, extensive comparison with H. mitratum and H. aequatoriale and distribution in Colombia; figs. 2, 3m –n, 4d, k, 5c, 7c–f, 8d–e, 9e);— Stand-Pérez et al. 2019: 92–93 (key to species, ♁ in couplet 13’; brief remarks; figs. 6c, 10d–f, 19).

Material examined. 1♁ BRAZIL, Acre state, Rio Branco, Igarapé do Tucuman , 10.x.1983, A.B.M. Machado leg., ABMM ; 6♁♁ COLOMBIA, Chocó Department, Unión Panamericana Municipality, Corregimiento Salero , 24.vii.2010, (6.6108, -74.5771, 100m asl), L. Pérez & J. Montes leg., UARC ; 1♁ Córdoba Department, Tierralta Municipality , vereda La Oscurana, (8.1172, -76.1076), ICN ; 1♁ Chocó Department, Nuquí Municipality, Corregimiento Arusi , iv.2018, C. Flórez leg., CEBUCES; 3♁♁, Department of Antioquia, Maceo Municipality , 22.i.2001, (6.5441, -74.6402, 490m asl), S. Pérez & A. Vélez leg., CEUA ; 2♁♁ Puerto Berrio, Estación La Cristalina , Hacienda La Guajira, 4–6.ix.2008, (6.3700, -74.5752, 300m asl), C. Bota leg., CEUA ; 1♁ San Roque Municipality, San Jose del Nus Township , 7.ii.2009, (6.4875, -74.8342, 800m asl), C. Bota leg., CEUA ; 1♁ El Topacio Township , 23.vii.2013, (6.4694, -74.9019, 950m asl), J. Cogollo & Yenny Correa leg., CEUA ; 1♁ Nariño Municipality, Puente Linda Township , 26.vii.2009, (5.5841, -75.1286, 750m asl), C. Bota leg., CEUA ; 4♁♁ Remedios Municipality, La Cruz Township, (6.9088, -74.5672, 523m asl), L. Campuzano & C. Bota leg.; 4♁♁, San Luis Municipality, La Garrucha Township , 23.xii.2009, (6.0040, -74.9390, 397m asl), C. Bota leg., CEUA ; 3♁♁ San Carlos Municipality, Samana Township , 27.iii.2012, (6.1500, -74.8000, 600m asl), Flórez & C. Bota leg., CEUA ; 4♁♁ El Carmen de Viboral Municipality, El Porvenir Township , 29.xi.2016, (5.8969, -75.1795, 950m asl), C. Bota leg., CEUA ; 1♁ VENEZUELA, Táchira State, San Felix , 12.iv.1996, (350m asl), J̧rg DeMarmels leg., CEUA .

Known distribution. Brazil (Acre state), Colombia, Costa Rica, Panama and Venezuela.

Diagnosis and remarks. The following character combination distinguishes this species from the remainder of Group B species: BP greatly swollen or expanded ( Figs. 50c–d ); all portions of cercus subequal in length ( Fig. 50c ); ridge above ML straight, long; ML apex acute ( Fig. 50e ) or blunt ( Figs. 50c–d ); in dorsal view, MP-AP junction rounded ( Fig. 50e ). Donnelly (1992) proposed the subspecies H. mitratum atroterminatum for populations of Central Panama, which was later recognized in some populations found in Colombia ( Bota-Sierra & Novelo-Gutiérrez 2017). The main characteristic used to separate H. mitratum from its subspecies is the absence of black coloration on dorsal S8, which is black in H. mitratum atroterminatum .

Figures

FIGURE 50. Heteragrion mitratum: (a) anterior view of head; (b) lateral view of pterothorax; (c–d) mediodorsal view of cercus; (e) dorsal view of cercus. BP: basal portion; MP: medial portion; ML: medial lobe; AP: apical portion.