Heteragrion ictericum 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 : 54-55

Heteragrion ictericum Williamson, 1919

( Figs. 38a–d )

[Key locator: Key to Group A species, couplet 5 (4’)]

Heteragrion ictericum: Williamson 1919: 17–20 (key to species, ♁ in couplet c1, ♀ in couplet c2; description of ♁ and ♀, illustrations of wings, ♁ and ♀ head, genital valves in ventral view, head profile, appendages in mediodorsal and lateral view, ♁ and ♀ prothorax; figs. 8, 14–15, 54, 65, 74–75, 134–135);— De Marmels 1987: 229 (states that H. ictericum differs from H. silvarum in color pattern of thorax and in denticulation of ♀ valves; comparison with H. pemon );— De Marmels 1990: 335 (species recorded in Venezuela);— Garrison et al. 2003: 15 (data on holotype);— Lencioni 2005: 132 (data on description and distribution, illustration from Williamson 1919; figs. 81a– e);— Garrison et al. 2010: 88 (list of Heteragrion species);— von Ellenrieder 2012: 59, 67, 73 (list of species from Suriname; Plate III a);— Lencioni 2013: 10 (information on types, distribution, diagnosis; figs. 17, 33a–c, 46d–f, 48g –h, 57, 72);— von Ellenrieder et al. 2017: 3 (list of species from Guyana);—Garcia-Jr. et al. 2021: 4 (list of species from Amapá state, Brazil);— Rochas et al. 2022: 200 (species recorded from French Guiana).

Material examined. 1♁ BRAZIL, Amapá state, Serra do Navio, Represa , ii.1957, A.B.M. Machado leg., ABMM ; 1♁ Laranjal do Jari, Resex Cajari , 28.xi.2017, T.B. Miguel leg., LABECO ; 1♁ 21.viii.1943, “Wilh”? leg., ABMM ; 1♁ Amazonas state, Manaus , 26.vi.1922, J. H. Williamson & J.W. Strohm leg., FAAL .

Known distribution. Brazil (states of Amazonas and Amapá), Guyana, French Guiana, Suriname and Venezuela.

Diagnosis and remarks. This species possesses a tubercle or apophysis on the ventral BP portion, a feature that is shared only with H. triangulare and H. pemon . The following character combination distinguishes this species from the remainder of Group A species: BP the shortest portion of the cercus ( Figs. 38c–d ); MP the longest, ML a broad plate, bearing small teeth, roughly squared apex ( Figs. 38c–d ).

Figures

FIGURE 38. Heteragrion ictericum: (a) anterior view of head; (b) lateral view of pterothorax; (c) mediodorsal view of cercus; (d) lateral view of cercus. BP: basal portion; ML: medial lobe.