Navicordulia tangoyi, Fleck & Haber, 2025

Fleck, Günther & Haber, William A., 2025, A new species of the genus Navicordulia Machado & Costa, 1995 from Ecuador (Insecta: Odonata: Corduliidae s. str.), Zootaxa 5627 (1), pp. 193-200 : 194-197

Description of Navicordulia tangoyi sp. nov.

( Figures 1–16 )

Material studied. Holotype male: Ecuador, Prov. Sucumbios, 8.2 km NW of Playas de Cuyabeno villlage, Río San Francisco , 850 m north of Nicky Lodge on Río Cuyabeno , Long. -75.9244, Lat. -0.1977, Alt. 210 masl, 31 January 2016. Collectors: Santiago Villamarin, William Haber, Fred Morrison, Jacob Tangoy, and Jeff Boettner.

Etymology.This species is named in recognition of Jacob Tangoy, the indigenous Quichua Ecuadorean naturalist and guide who organized and led several of our expeditions to eastern Ecuador. His family has frequented the Río San Francisco region for generations. Like other Ecuadorean indigenous guides who we have worked with, Jacob has an amazing knowledge of nature and ability to observe and understand it.

Morphological description. Medium-sized dragonfly. Head and thorax hairy. Body with metallic reflections, blackish abdomen and lacking citron-yellow markings ( Fig. 1 ).

Head. Face, frons, vertex and occiput covered by strong black hair-like setae ( Fig. 2 ). Labium light brown yellowish, labrum and clypeus light brownish orange, frons with lower margin light brownish orange and with upper and dorsal parts with strong green metallic reflections ( Fig. 2 ). Vertex with green metallic reflections, slightly flattened on top. Antennae dark brown/blackish with long flagellum. Eyes in contact over a rather short distance dorsally of ca 0.7–0.8 mm ( Fig. 2 ). Posterolateral margin of eyes with a small indentation (often encountered in corduliids). Occiput dark brown.

Thorax. Prothorax light brown to yellowish, with posterodorsal rounded margin covered by a fringe of rather long hair-like setae. Synthorax abundantly covered by pale hair-like setae, brown with strong green metallic reflections ( Fig. 1 ). Legs moderately long compared to body dimension, hind-leg being slightly longer than half of the HW (ca 55%) and slightly longer than half of the abdomen excluding anal appendages (ca 55%) ( Fig. 1 ). Tibiae dark brown to blackish, tarsomeres blackish and tarsal claws dark brown; profemora brown with apical half turning gradually dark brown, mesofemora mainly blackish/dark brown with about basal 1/4 brown, metafemora blackish/ dark brown. Tibial keels present on prothoracic and metathoracic legs and occupying respectively 25% and 85% of the tibiae with metatibial keel slightly wider in basal 15%. Ventral tooth of tarsal claws well developed and situated at about 3/5 of claw.

Wings ( Fig. 3 ): light saffron tinged at HW base and slightly smoked at apices; veins black to dark brown; membranule well developed, brown; Pt dark brown, with proximal and distal margins not parallel, distal margin being distinctly more oblique than proximal one; FW nodus moderately shifted distally with nodal ratio 1.3 (distance from base of wing to nodus / distance of nodus to wing apex); FW antenodal crossveins 8 of the first and second rank (respectively between C and ScP and between ScP and R), and well aligned or sub-aligned but only Ax1 and Ax2 distinctly reinforced and bracket-like; gap separating Ax1 and Ax2 distinctly more important than gaps separating other antenodals; HW antenodals 5 with those of first and second ranks well aligned and lightly reinforced, the reinforcement diminishing distally; FW postnodal crossveins 5–6; HW postnodal crossveins 7; crossveins distal to pterostigma 3–4 (4 on right FW); base of pseudo-IR1 distal to Pt in FW and below Pt in HW; base of the sectors of arculus slightly proximal to Ax 2 in FW and midway to Ax1 and Ax 2 in HW; sectors of arculus very shortly united in FW and HW (slightly more in HW); bridges with only one crossvein, this one placed distal to subnodal transverse; all hypertriangles and discoidal triangles free; FW subtriangles elongated and 2-celled; no HW subtriangles (submedian space crossed only by basal CuP between anal triangle and anal loop); position of antero-proximal angle of HW discoidal triangle shortly but distinctly proximal to posterior crossvein of arculus; Rspl rather well defined, with concavity distinct but vein very slightly zigzagging and covering one row of 5 cells on FW and 4–5 cells on HW; Mspl rather poorly defined in FW and covering one row of 4 cells; Mspl weak in HW and covering one row of about 3–4 cells; FW discoidal field with two rows of cells except at posterior wing margin of the left wing (3 cells) and with MA and MP grossly parallel up to distal part of Mspl, distally very slightly convergent on the left wing more strongly on the right wing; anal loop with 11–12 cells and distinct midrib; anal loop with 2 cells at submedian space margin, distally not dilated, thus without distinct toe and with sole (CuAb) made by 2 cells; anal loop and posterior wing margin separated by 2 rows of cells throughout; anal triangle well defined, rather well elongated and 2-celled and prolonged posteriorly by the typical generic strong anal triangle excavation; consequently anal angle strongly marked.

Abdomen. Slender but with S7–8 slightly wider than S 9–10 in dorsal view, about as long as HW; brown on S1–2 and anterior part of S3, progressively turning blackish/dark brown on S3, blackish/dark brown on S4–10. Green and purple metallic light gloss on dorsal S2–8, gloss diminishing distally, hardly visible on S8. Longitudinal ventral membranes and adjacent carinae on S6–9 brown to yellowish. In lateral view abdomen swollen at S2 and anterior part of S3, narrowing from S3 to anterior half of S6, then slightly expanding again from distal half of S6 to S9 ( Fig. 1 ); in dorsal view constricting on S3, expanding progressively from distal S4 to posterior margin of S7, then constricting again at S9. Lateral carina extending from distal half of S4 to S8, moderately marked on S4 and progressively better marked from S5 to S8. Dorsal carina absent, except on S10, where it appears as a small crest occupying the basal half. Genital fossa ( Figs 4–5 ), anterior lamina short and hamule of the secondary accessory genitalia similar to those found in other species; S2 tergal ventral edge bearing a fringe of long and strong setae, these being straighter and even stronger at genital lobe, contrasting with lateral surface almost completely devoid of long/strong setae; genital lobe large and subtriangular with, in lateral view, ventral margin concave and distal margin not strongly bent (making an angle of 80° with body axis) and lacking basal excavation. Vesica spermalis ( Figs 6–8 ) dry and distal part ostensibly deformed but on the whole similar to that of the other species; pair of distal flagella significantly shifted on the right and apparently grossly of similar development (possibly close to B’ type sensu Fleck & Juillerat 2019); sclerotized part of V4 ending as a distinct and well erected and pointed distal horn (see Pfau 2011); no trace of a third small flagellum (see Fleck & Juillerat 2019). S7–8 pilose complex build as follows: on S7 made by structures present on pleurites and sternite, distal 4/10 of pleurites enlarged and furnished with a dense brush of long setae covering and hiding a large part of the sternal structure ( Fig. 9 ); sternite with an anterior median longitudinal carina, bordered by rather long scattered setae; this carina moderately developed but gradually increasing in strength from proximal 4/10 to proximal 6/10 to form a raised plateau, and this broadened area connected to a transversal well developed formation made by a pair of prominent bluntly pointed tubercles, each bearing several long back directed setae and continued laterally by a weak carina ( Figs 9–10 ); this transverse formation connected to a distal second transverse formation via a strong carina bearing three moderately long and erect setae on each side and extending from distal 4/10 to distal 2/10; distal transverse formation made by a distinct median small erect tongue, angled almost 90 degrees to the carina, bearing some long back directed setae along its rim and down the back side and prolonged laterally by a carina vanishing distally ( Figs 9–10 ). On S8, pilosity comparable to those of other species with an anterior glabrous area occupying the proximal 2/10 of the sternite continued by a field of long, fine, straight and ventrally directed setae extending to proximal 2/10 to about proximal 7/10 and by a field of somewhat shorter setae extending from 8/10 to posterior margin ( Fig. 9 ). Anal appendages ( Figs 11–16 ), cerci (superior anal appendages) blackish/dark brown, rather short, slightly longer than S9+10; cerci in dorsal view well separated at base, arched in the proximal 7/10, and straight distally; cerci rather thin about ten times longer than wide (width taken at midlength of the cercus); distal fourth of the cerci in dorsal view with an abrupt and strong S-shaped undulation (derived from ventro-lateral tubercle?), the deflection at external margin being> 0.8 cercus width taken just distal to deflection ( Fig. 15 , compare red and yellow arrows); cerci with a smooth and small dorsal tubercle close to inner margin and in contact with S10; presence of a low ventral elongated bulge lacking setae (ventro-medial tubercle?) extending from about 6/10 to near the level of strong deflection at distal fourth ( Fig. 16 , blue arrow); cerci with two marked carinae not connected to any tubercles, the proximal one, lateral, small, almost vertical and occupying the basal 1/10 (remnant of ventro-lateral carina?) ( Fig. 16 , yellow arrow), and the second one, subventral, starting at basal fourth and ending close to ventral bulge at 6/10 of length after progressive attenuation (ventro-latral carina?) ( Fig. 16 , red arrow); distal half of cerci without dense brush of long setae (pilosity made by regularly distributed setae); epiproct (inferior anal appendage) about 9/10 the length of cerci, blackish to dark brown, narrow and triangular in ventral or dorsal view and with apical margin shortly truncated, slightly bilobed due to tip curved upwards, and forming a short acute convex ridge with two minute teeth at edges.

Measurements (mm). Total length (including anal appendages) 39.3, HW length 26.0, hind leg length (including coxa and claws) 14.2 mm, abdomen excluding anal appendages 26.0, cercus length in dorsal view 2.0.

Figures

FIGURES 1–3. Navicordulia tangoyi sp. nov., male holotype. 1. General habitus in left lateral view. 2. Head in dorsal view.3 Wings in ventral view.

FIGURES 4–8. Navicordulia tangoyi sp. nov., male holotype. 4. S2 secondary genitalia (genital lobe) and base of hind wing in left lateral view. 5. S2 secondary genitalia in ventral view. 6–8. Vesica spermalis (air dried). 6. Left lateral view. 7. Right lateral view. 8. Distal segments in ventral view.

FIGURES 9–16. Navicordulia tangoyi sp. nov., male holotype. 9. Pilose complex of the abdominal segments 7 (on the left) and 8 in right latero-ventral view (setae non figured on the right side). 10. Detail of the sternite 7 in right latero-ventral view (setae figured only on the left and median parts of transversal structures). 11–14. Two last abdominal segments and anal appendages. 11. Dorsal view (natural postmortem posture). 12. dorsal view (secondarily open for better view). 13 Lateral view, with slight dorsal component, allowing to show small basal tubercle on left cercus. 14. Lateral view, with slight ventral component, allowing to better show lateral and ventro-lateral structures. 15. Left cercus in dorsal view showing the deflection at external margin, coloured arrows allow measurement of the deflection (see text). 16. Left cercus in sub-ventral view showing the proximal carina (yellow arrow), the median sub-ventral carina (red arrow), and the small sub-ventral elongated bulge (blue arrow).