Dactylobasis demarmelsi, Pérez-Gutiérrez, 2019

Pérez-Gutiérrez, León Andrés, 2019, Dactylobasis gen. nov. from Colombia, a new genus of Zygoptera with Teinobasini affinities (Odonata: Coenagrionidae), Zootaxa 4656 (2), pp. 232-242 : 235-240

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Dactylobasis demarmelsi

sp. nov.

Dactylobasis demarmelsi sp. nov.

Etymology. The specific epithet is named in honor of Professor Doctor Jürg Carl De Marmels for his scientific work inspiration and extensive contribution to Odonatology, especially concerning the neotropical fauna.

Specimens examined. Holotype male, COLOMBIA, Chocó Department, Salero (05°19’01” N 76°36’52” W), alt. 129m, 10 VIII 2005, L. A. Pérez leg. ( SAIA _0287) GoogleMaps . Allotype same holotype but ( SAIA _0288). Paratypes 25 males, 18 females (all in UARC) GoogleMaps : 6♂♂, 4♀♀, Chocó Dept., Quibdó, km 10 via Tadó , sector “Los Chalets” (05°19’01” N 76°36’52” W), alt. 150m, 10 VIII 2008, L. A. Pérez leg. GoogleMaps ; 5♂♂, 4♀♀, 10 VIII 2010, L. A. Pérez leg. GoogleMaps ; 6♂♂, 6♀♀, 10 VIII 2012, L. A. Pérez & J. M. Montes leg. GoogleMaps ; 8♂♂, 4♀♀, 10 VIII 2013. L. A. Pérez & J. M. Montes leg. GoogleMaps

Description of holotype. Head ( Figs. 2 View FIGURE 2 a–b; 5): Labium pale blue, base of mandible black, tip pale; labrum shiny black; anteclypeus pale blue, postclypeus entirely dark metallic green, gena green, frons deeply sunk between antennal bases, angulated with indication of a frontal rim; occipital rim prolonged laterally into a curved carina running in direction to antennal base and stopping at level of anterior end of lateral ocellus; frons, vertex and top of head dark metallic green, black along inner border of compound eyes, antenna with scape pedicel and flagellum brown. Postocular spots and mark between lateral ocellus and antennal base absent. Rear of head pale green. Com- pound eyes in life dorsally aquamarine blue, below pale blue to lime green ventrally. Postocular lobe not surpassing compound eye posteriorly, occiput convex.

Thorax. Anterior lobe of pronotum inflated and pale yellow with dark brown anterior edge, rest of dorsum of pro- and pterothorax entirely dark metallic green ( Fig. 2 View FIGURE 2 c–d). Propleuron sky-blue globose laterally, with coniform, prominent, lateral expansion with posteriorly directed spinulose texture ( Fig. 2e View FIGURE 2 ), pronotal hind lobe rounded, dark brown in middle and pale blue laterally. Procoxa pale blue. Mesanepisternum entirely dark metallic green with a pair of horns directed cephalad, convergent in dorsal view, and with tips curved towards dorsal carina ( Fig. 2f View FIGURE 2 ), in lateral view depressed; middorsal carina black. Dorsal third of mesokatepisternum dark metallic green, remainder pale green to skyblue. Mesanepimeron with dark metallic green not reaching interpleural suture except at dorsal fifth; metanepisternum sky blue, with ventrally incomplete, shiny brown black stripe along metapleural suture connecting above with black antealar carina above. Remainder of thorax sky-blue. Axillar and humeral sclerites skyblue.

Legs short, pale, with tips of femora, tibiae and tarsomeres dark brown, hind femur with 4–5 spurs, hind tibia with 6 spurs externally, each of which are slightly shorter than intervals separating them; tarsal claws without tooth, but with very low swelling.

Wings ( Fig. 4 View FIGURE 4 a–b) narrow, hyaline, veins brown; 11 complete postnodals plus one incomplete (same in Fw and Hw), costal side of quadrangle less than half as long as distal side; vein that descends from quadrangle straight to posterior margin of wing; three cells between quadrangle and vein descending from subnodus, CuA extending 7 cells distal to vein descending from subnodus, IR1 branching at 10th Pxl, RP2 at 6 th Px, pterostigma pale brown, a parallelogram, from slightly shorter to slightly longer than underlying cell; petiolation ceasing at CuP.

Abdomen. Dorsally shiny black, S1–2 laterally blue, S3–8 with bluish white basal ring interrupted by black at dorsal carina; S3–7 lateroventrally pale brown to bluish (S7), black on apical sixth, S8 blue laterally, S9 and 10 mostly black, postero-dorsal margins of S7–9 with robust denticles. Pruinescence lacking. Cercus and paraproct brown with dark tip ( Fig. 3a View FIGURE 3 ). Cercus short and ventrally concave ( Fig. 3b and e View FIGURE 3 ), a fleshy to moderately chitinized digitiform ventrobasal spur, articulated to a ventral membranous area at base of cercus ( Fig. 3a, c, e View FIGURE 3 ); paraproct long with short, thick ventral process at half its length, basally wide and cylindrical, straight, directed caudad and dorsad towards incurved tip.

Genital ligula. Shaft of genital ligula with 5–7 soft setae on each side, medial segment broad, inner fold absent, external fold well developed, apex entire with distal lateral lobes triangular and pointed ( Fig. 4 View FIGURE 4 c–e)

Measurements (in mm): Total length 39.4; Fw 19.6, Hw 18, abdomen (excluding appendages) 31.4, cercus 0.23 (61% longer than S10, dorsally), paraproct 1.2.

Female (Allotype) ( Fig. 6 View FIGURE 6 ). General appearance as in male, but larger; no sexual dimorphism by color detectable, but abdomen with pale zones more expanded; S6–7 remarkably bright blue in lateral view, as well as sternum of S8; external valve of ovipositor blue in base towards middle of segment and black in tip. Pronotal hind lobe convex and low, propleuron as in male, the mesepisternal horns slightly more divergent in comparison with those of male. Posterior margin of S10 complete. Ovipositor surpassing tip of cercus, external valve finely serrate and setose (7–10 setae) along ventral border ( Fig. 3g View FIGURE 3 ), styli as long as ventral margin of S10. Wing venation: postnodals 12+ 1 in HW and 11+ 1 in FW.

Measurements (in mm). Total length 42; abdomen 34; FW 23; HW 22.

Variation in paratypes. Some specimens show variation in the degree of inclination of the horns over the prothorax, but no major variation was detectable in the 46 specimens than I examined. In summary as follow; in males: Total length 38.2–39.3; Abdomen 30–31; HW 18.5; 19.2. Females: Total length 40–42; abdomen 32.3–34; FW21.5–22.7; HW 20–21.8. CuA extending 8 cells distal to vein descending from subnodus ( Fig. 4 View FIGURE 4 a–b). Coloration patterns without variation noticeable.

Larva. Unknown.

Habitats and habits. Both localities are located within pluvial tropical forest. Adults were relatively abundant mostly perching below leaves of shrubs near marshes within riparian forest ( Fig. 7a View FIGURE 7 ) or flying slowly from near ground level up to 3 m near the trees, males and females fly slowly in densely arboreal areas close to small streams, slow current and with abundant retained plant material ( Fig. 7b View FIGURE 7 ).

Distribution. This species is probably endemic to the Biogeographic Province Chocó, Colombian Pacific coast.