Mesamphiagrion ecuatoriale, Ellenrieder, Natalia Von & Garrison, Rosser W., 2008
Ellenrieder, Natalia Von & Garrison, Rosser W., 2008, Oreiallagma gen. nov. with a redefinition of Cyanallagma Kennedy 1920 and Mesamphiagrion Kennedy 1920, and the description of M. dunklei sp. nov. and M. ecuatoriale sp. nov. from Ecuador (Odonata: Coenagrionidae), Zootaxa 1805, pp. 1-51 : 34-42
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Mesamphiagrion ecuatoriale sp. nov.
Figures 3 View FIGURE 3 c; 4 d–e; 7 b; 16; 41; 62; 72; 103
Etymology: Named ecuatoriale in reference to its distribution.
Type specimens: Holotype (ɗ). Ecuador. Napo Prov.: seep and marsh along Archidona-Baeza road, 00° 36 ' 12 ''S, 77 ° 50 ' 36 ''W, 2100 m, 19.xi. 1997, T.W. Donnelly leg. Allotype (Ψ). Same data. Both in FSCA. Paratypes (3 ɗ, 1 Ψ). same data 2 ɗ, 1 Ψ (TWD); same data 1 ɗ (RWG).
Description. Male holotype
Head ( Fig. 3 View FIGURE 3 c). Labium pale yellow; labrum, base of mandibles, anterior surface of genae, anteclypeus, and antefrons light blue, with a black medial spot and a marginal spot on each side along posterior margin of labrum; postclypeus, postfrons, antennae, and top of head black, with a pair of large pale blue postocular spots; rear of head pale yellow. Frons in profile rounded.
Thorax. Prothorax black except for medial portion of anterior lobe, a latero-dorsal oval spot on each side of middle lobe and lateral margin of middle lobe pale blue; medial lobe of posterior prothoracic lobe developed into caudally projected squarish plate separated from lateral lobes by an obtuse angle, with smoothly rounded margins and slightly concave dorsal surface ( Fig. 16 View FIGURES 15 – 24 a). Mesepisternal plates approximately flat and triangular. Pterothorax largely pale blue becoming pale bluish-yellow latero-ventrally, with a mid-dorsal black stripe narrower than antehumeral pale blue area, a narrow black stripe along humeral suture and a reddish brown oval spot at posterior end of second lateral suture ( Fig. 3 View FIGURE 3 c). Venter of thorax bluish yellow. Legs black except pale blue coxae, trochanters and a spot along basal third to half of flexor surface of femora, and pale brown basal 3 / 4 of pretarsi; 8 metafemoral spurs on left femur (right femur missing), longer than width of femur on distal half; metatibial spurs slightly longer than intervening spaces; pretarsal claw with well developed supplementary tooth. Wings ( Fig. 7 View FIGURE 7 b) hyaline; pt dark reddish brown, covering one cell, with anterior (costal) margin slightly longer than posterior margin; CuP reaching CuPAA slightly distal to confluence of CuPAA with hind margin of wing, petiolation ending approximately at midpoint between Ax 1 and Ax 2; Px 14 in FW, 12 in right HW, 13 in left HW; RP 2 branching slightly proximal to Px 7 in FW, slightly proximal to Px 6 in HW.
Abdomen ( Fig. 4 View FIGURE 4 d). Dorsum of S 1–6 and S 10 black, of S 7 pale blue except basal eighth black, of S 8–9 pale blue; sides of S 1–2 and base of S 3 pale bluish yellow, most of S 3 and S 4–7 pale yellow. Genital ligula ( Fig. 41 View FIGURES 38 – 48 ) with apex concave, an inner medial process on ental membranous transverse fold basal to lateromedial lobes, a pair of latero-apical lobes of narrow base directed anteriorly and a pair of latero-medial lobes of broader base. Cercus ( Figs. 62 View FIGURES 60 – 69 , 72) shorter than S 10, with a short subapical hooked dorsal process, a pointed ventro-basal process, and two blunt ventro-apical processes; color of outer surface black. Paraproct pale blue, with medially directed branch and tip of ventral branch black ( Fig. 62 View FIGURES 60 – 69 ).
Dimensions. Total length 38.5 mm; abdomen length 31.5 mm; FW 24.0 mm; HW 23.0 mm.
Head. As in holotype but base of mandibles, anterior surface of genae, anteclypeus, and antefrons pale bluish yellow; postclypeus with a pair of transversely elongate oval yellow spots, and anterior portion of postfrons pale yellow.
Thorax. As in holotype but mid-dorsal black stripe margined by reddish brown, and faint reddish brown narrow stripe along humeral suture. Legs yellow, except distal portion of femora, tibiae, tarsi and tip of pretarsi reddish brown. Medial portion of posterior lobe of prothorax only slightly projected caudally at mid-line ( Fig. 16 View FIGURES 15 – 24 b). Mesepisternal plates wider than in male holotype ( Fig. 16 View FIGURES 15 – 24 c). Wings as holotype but pt pale reddish brown; 13 Px in left FW, 13 in right HW, 12 in left HW.
FIGURE 109. Juvenile adult male of Mesamphiagrion laterale ( Venezuela, Mérida State, road to La Culata, 2646 m, 04.vii. 1991). Photographed by J. De Marmels.
Abdomen. Color pattern as in holotype, except dorsum of S 1–7 black, of S 8 pale blue at distal third, of S 9 pale blue at distal half, of S 10 entirely pale blue; latero-ventral margins of terga pale yellow from S 1–10 ( Fig. View FIGURE 4
4 e). Cercus shorter than S 10, conical and brown; paraprocts pale yellow. Vulvar spine on S 8 well developed. Sub-basal plate of ovipositor broadly rounded; outer valve of ovipositor with a single row of teeth; tip of ovipositor (excluding stylus) extending beyond posterodorsal margin of S 10 but not reaching tip of cercus ( Fig. 4 View FIGURE 4 e).
Dimensions. Total length 38.0 mm; abdomen length 31.0 mm; FW 25.5 mm; HW 24.5 mm.
Variation in paratypes. Paratype males are similar to holotype but the anteclypeus in three has a pair of transverse oval black spots, and outer surfaces of cercus delimited between dorsal, inner ventro-apical process, and outer ventro-apical processes are pale blue. One male has basal sixth of S 7 black. Female as in allotype.
Male paratypes Px in FW 13–16, in HW 12–13; RP 2 branching between Px 7–8 in FW, between Px 5–6 or slightly proximal to 6 in HW. Female Px in FW 15 – 14, in HW 14 – 13; RP 2 branching slightly proximal to Px 7 in FW, between Px 5–6 in HW.
Dimensions. Total length males 35.5–38 mm [mean 36.8 mm; SD 1.26; n = 3]; total length female 39.0 mm; abdomen length males 29.0– 31.5 mm [mean 30.3 mm; SD 1.26; n = 3]; abdomen length female 31.5 mm; FW males 23.0– 24.5 mm [mean 23.6 mm; SD 0.76; n = 3]; FW female 26.5 mm; HW males 22.0– 23.5 mm [mean 22. 7 mm; SD 0.76; n = 3]; HW female 25.5 mm.
Diagnosis. Male of M. equatoriale shares only with M. occultum , M. ovigerum , and M. risi the short subapical dorsal process of cercus but differs from them by the ventrally pointed ventro-basal process of the cercus (Fig. 72) that is rectangular in M. occultum (Fig. 70 b), narrowly spatulate and curved anteriorly in M. ovigerum (Fig. 71), and broadly triangular in M. risi (Fig. 74). Absence of metapleural dark stripe ( Fig. 3 View FIGURE 3 c) is shared only by males (female is unknown) of M. occultum , M. ovigerum , and M. tepuianum . Mesamphiagrion equatoriale differs from M. tepuianum in following characters (contrasting character states for M. tepuianum in parentheses): medial lobe of posterior prothoracic lobe projected caudally into a semicircular lobe ( Fig. 16 View FIGURES 15 – 24 a; bilobate and only slightly projected, Fig. 19 View FIGURES 15 – 24 ); basal segment of genital ligula lacking long setae along sides ( Fig. 41 View FIGURES 38 – 48 a; with long setae along sides, Fig. 44 View FIGURES 38 – 48 ); and acutely pointed ventro-basal process of cercus in medio-dorsal view (Fig. 72; broadly rectangular ventro-basal process, Fig. 73).
Female of M. ecuatoriale differs from other known females of Mesamphiagrion by medial lobe of posterior prothoracic lobe only slightly projected medially beyond lateral lobes ( Fig. 16 View FIGURES 15 – 24 b), whereas the same is well-developed and posteriorly projected in M. demarmelsi and M. tamaense ( Figs. 20 View FIGURES 15 – 24 b- 21 b), and bilobate in M. dunklei , M. gaianii , and M. laterale ( Figs. 22 View FIGURES 15 – 24 c, 23 b- 24 b).
Biology. Adults collected at seeps and marsh. Breeding habitat and larva unknown.
Distribution. Ecuador (Napo Dept.), at 2100 m above sea level ( Fig. 103 View FIGURE 103 ).
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