Epipleoneura angeloi Pessacq & Costa 2010, sp. nov.

Epipleoneura angeloi sp. nov.

Figures 1a–c, 2a–b, 3a–b, 4.

Etymology. This species is named after Angelo B. M. Machado, Universidade federal de Minas Geráis (UFMG), in recognition of his extensive contribution to the knowledge of Neotropical Odonata.

Specimens examined. Holotype ♂: Brazil, Mato Grosso State: Chapada dos Guimarães, riacho da represinha, about 15°27’11”S, 55°44’19”W, leg. Santos, N.D. & Carvalho, J.U. (Col 16), 28.x.1983 (originally labeled " Epipleoneura ♂ "). Paratypes: 10 ♂♂, same data as holotype (all originally labeled as " Epipleoneura ♂ "); 3 ♂♂, same data as previous but: Rio Coxipozinho, about 15°27'S, 55°44'W; 1 ♂, Buriti, Chapada dos Guimarães, about 15°24'54"S, 55°48'27"W, leg. Santos, N.D. & Machado, J.P., 13.iv.1963 (originally labeled as " Epipleoneura williamsoni ?"); 2 ♂♂, Goiás State: Riacho Jataí, 17°52ʹ51ʺS, 51°42ʹ50ʺW, leg. Santos, N.D. Netto, L.F. R. & Dacio, C. V.N. 12.x.1982 (originally labeled as " Epipleoneura williamsoni ").

Additional material. 1♀, same data as holotype but: Rio Coxipozinho.

Male holotype. Head. Dorsally metallic green; antennifer with a dorsal carina and with distal half brown, basal half yellow; frons angulate; antefrons yellow with lateral and dorsal margins brown; postclypeus dark brown, anteclypeus yellow; labrum light brown dorsally, yellow ventrally; dorsal half of genae brown, ventral half yellow; rear of head black ventrally, with two narrow yellow stripes bordering eyes; labrum and maxilla yellow.

Thorax. Prothorax dorsally metallic green, sides light brown, becoming yellow ventrally. Mesepisternum metallic green, mesepimeron brown with metallic green reflections, metepisternum brown with anterior yellow areas, metepimeron yellow; pterothoracic venter, coxae and trochanters light yellow; remainder of legs light brown. Wings hyaline, venation black; MP ending 0.5 cell distally from the vein descending from subnodus; IR2 and RP3 separated by a short crossvein one cell posterior to their origin; divergence of RP-RA (arculus) at Ax 2, in right Hw slightly distal to Ax 2; IR1 beginning at Px 6, in left Fw beginning at Px 7; RP2 beginning at Px 4 in Fw and proximal to Px 3 in Hw; pt pale brown, about 2/3 length of underlying cell; 10 Px in right Fw, 9 in left Fw wing, 8 in Hw.

Abdomen. S1–6 dorsally dark brown, ventrally dark yellow, S3–7 with a distal dark brown ring, S7 with a more extended dark brown pattern. S8–10 reddish brown. Cercus (Figs. 1a, 1b) brown, with a dorsal and a ventral branch. The former longer, horizontally flat, with a small black spine close to apex on its inner margin, partially covered by hair-like setae. Ventral branch rounded in lateral view, internally concave, spoon-like. Epiproct (Fig. 1c) well developed, with two elongated lateral lobes, middle section moderately elevated longitudinally.

Paraproct conical, short, not surpassing level of ventral branch apex. Genital ligula (Fig. 2a–b) lacking internal fold, with a pair of latero-posterior pedunculate processes, apex of S3 with a shallow cleft and two small, rounded lateral lobes.

Dimensions. Total length 30.0; abdomen length 24.6; Fw: 15,9; Hw: 15.1.

Paratypes. Same as holotype except as follows: Divergence of RP-RA (arculus) distal in most specimens. Venation - Px: Fw 10 (55%), 11 (45%); Hw 8 (40%), 9 (50%), 10 (10%). RP2: at Px 4 in Fw; at Px 3 or proximal to it in Hw. IR1: at Px 6 (10%), 7 (70%) or 8 (20%) in Fw; at Px 6 (60%) or 7 (40%) in Hw.

Dimensions. (n=10): abdomen length 24.9 – 27.32 [mean 25.43; SD 0.7]; Fw 15.7 – 17.2 [mean 16.3; SD 0.45]; Hw 14.6 – 16.3 [mean 15.4; SD 0.53].

Female. Head. Same as in male, but yellow on anterior side of head replaced by blue, and black pattern of genae and on rear of head less extensive.

Thorax. Prothorax: Coloration same as male, posterior lobe (Fig. 3a–b) erect, with a wide rounded medial lobe visible in dorsal view and two rounded lateral lobes visible in lateral view. Pterothorax: mesepisternum metallic green, remainder of thorax light yellow, with an elongated light brown area with metallic green reflections on most of mesepimeron, except for narrow light yellow stripe on dorsal and ventral margins of mesepimeron. Legs light yellow. Wings hyaline, venation black; MP ending 0.5 cell distally from the vein descending from subnodus; IR2 and RP3 separated by a short crossvein one cell posterior to their origin; divergence of RP-RA (arculus) distal to Ax 2, in right Fw almost at Ax 2; IR1 beginning at Px 6; RP2 beginning at Px 3 in left Fw, at Px 4 in right Fw, at Px 3 in Hw; pt pale brown, about 3/4 length of underlying cell, as long as underlying cell in right Fw; 9 Px in left Fw, 10 in right Fw, 9 in left Hw and 8 in right Hw.

Abdomen. S1–7 dorsal half brown, ventral half light yellow; S2–7 basally each with a light yellow ring and a distal brown ring; S8–9 dorsal 2/3 brown, ventral 1/3 light yellow; S10 brown. Ovipositor apex slightly surpassing S10 distal margin.

Dimensions. Total length 30.0; abdomen length 23.0; Fw 17; Hw 16.1.

Remarks. The female described above was found in the same envelope as the paratypes from Coxiposinho River, together with a female of Epipleoneura metallica Rácenis, 1955, and it does not agree with the female of any species of Epipleoneura female currently known. The posterior margin of pronotum (Fig. 3a–b) is erect as in E. williamsoni (Fig. 3c–d), the closest species to E. angeloi. Since we have identified this female as E. angeloi by association, we have excluded it from the type series.

Diagnosis. See under discussion.

Distribution (Fig. 4): Brazil, Mato Grosso (Chapada dos Guimarães) and Goiás (Jataí River) States.