Heteragrion ictericum Williamson, 1919

LENCIONI, F. A. A., 2013, <p> <strong> Diagnoses and discussion of the group 1 and 2 Brazilian species of <em> Heteragrion </ em>, with descriptions of four new species (Odonata: Megapodagrionidae) </ strong> </ p>, Zootaxa 3685 (1), pp. 1-80 : 10

Heteragrion ictericum Williamson, 1919

Figs. 17 (♂ app), 33A–C (♂ thx), 46D–F (♀ thx), 48G–H (♀ S8–S10, basal plate), 57 (♂, ♀ habitus), 72 (map)

Heteragrion ictericum Williamson 1919: 17–20 , Figs. 8 , 14–15, 54, 65, 74–75, 134–135 (description of male and female, illustrations of wings, male and female head, genital valves in ventral view, head profile, appendages in mediodorsal and lateral view, male and female prothorax); De Marmels 1987: 229 (states that H. ictericum differs from H. silvarum in color pattern of thorax and in denticulation of female valves); Garrison et al 2003: 15 (data on type); Lencioni 2005: 132, Figs. 81A–E (data on description and distribution, illustration from Williamson 1919); Garrison et al 2010: 88 (list).

Types. holotype and allotype in UMMZ (not examined) .

Additional material examined. 7♂. Brazil: Amazonas State : Manaus, 26-VI-1922 , 1♂, leg. J. H. Williamson & J. W. Strohm; Rio Preto da Eva (ponto 6), 17 to 27-4-2004 , 1♂, leg. B. S. Godoy; Rio Urubu (ponto 5), 20 to 30- V-2004 , 1♂, leg. B. S. Godoy; Manaus, Manacapuru, 09-IX-2008, 4♂, leg. U. Neiss. Images of two females collected at Werehpai Camp and Kutari River Camp, Surinam, kindly provided by R. W. Garrison .

Illustration made from following specimens. 1♂ —(Fig. 17A, 17B, 33A, 33B, 33C, 57A)— Brazil: Amazonas State : Manaus, 26-VI-1922, leg. J. H. Williamson & J. W. Strohm ( NC 2617 ) . 2♀ —(Fig. 46D, 46E, 46F, 48G, 48H, 57B)— Surinam —Werehpai Camp and Kutari River Camp .

Distribution. Brazil (Amazonas), Venezuela, Guyana, French Guiana and Surinam.

Diagnosis. Male: Presence of a ventral apophysis shared only with H. triangulare , from which differs by morphology of medial process. Cercus in lateral view: dorsobasal expansion present. Ventrobasal apophysis present, almost straight (Fig. 17B). Cercus in mediodorsal view: basal and apical portions very small and subequal, medial portion longest. Ventral expansion not present, ventrobasal apophysis present. Medial process triangular plate with truncated apex, one sclerotized ridge crossing middle of process. Apical portion with spoonlike depression on dorsal surface (Fig. 17A). Female: Lateral projections of posterior lobe of prothorax smaller than in H. triangulare , most of lobe taken up by rounded and projected central area, pale brown (Fig. 46D); valves of ovipositor not reaching distal S10 and ventral margin with long spines; female cercus longer than S10, with small tuft of bristles at tip ( Fig. 48G ). Basal plate: dorsal edge an inverted S-shape, longer than concave outer edge. Ventral side same length as outer edge ( Fig. 48H ).

Figures

FIGURE 48. Female: Heteragrion muryense (A) S8–S10, (B) basal plate; Heteragrion tiradentense (allotype) (C) S8–S10, (D) basal plate; Heteragrion flavovittatum (E) S8–S10, (F) basal plate; Heteragrion ictericum (G) S8–S10, (H) basal plate.

FIGURE 7–10. Appendage structure (7 lateral view, 8 mediodorsal view, 9–10 ventral view): (D) ridge, (E) medial process, (J) external wall, (K) ventral surface of cercus, (L) medial wall, (N) ventrobasal expansion, (Q) ventrobasal apophysis.