Metaleptobasis orthogonia, Ellenrieder, 2013

Ellenrieder, Natalia Von, 2013, <p> <strong> A revision of <em> Metaleptobasis </ em> Calvert (Odonata: Coenagrionidae) with seven synonymies and the description of eighteen new species from South America </ strong> </ p>, Zootaxa 3738 (1), pp. 1-155 : 57-58

publication ID

https://dx.doi.org/10.11646/zootaxa.3738.1.1

publication LSID

lsid:zoobank.org:pub:77D1A6F6-C320-442B-AF31-83324E5EAF3B

persistent identifier

https://treatment.plazi.org/id/03E187ED-660E-FF81-D7A8-FEB8E0CCF84A

treatment provided by

Felipe

scientific name

Metaleptobasis orthogonia
status

new species

Metaleptobasis orthogonia new species

Figs. 1t View FIGURE 1 ; 3t View FIGURE 3 ; 4t View FIGURE 4 ; 5t View FIGURE 5 ; 8t View FIGURE 8 ; 9t View FIGURE 9 ; 10t View FIGURE 10 ; 11t View FIGURE 11 ; 12t View FIGURE 12 ; 14f

Etymology. From Greek orthos (adjective), meaning 'straight, normal, right', and gonia (noun), meaning 'angle, corner', referring to the aproximatedly right angled bends of male genital lobe and posterior hamule which characterize this species.

Types. ( all *) Holotype ♂: PERU, Loreto Dep., San Juan, Río Amazonas, near Iquitos {3°46'34''S, 73°16'53''W, 107 m}, viii 1939, J. Schunke leg. [ FSCA]; 1 ♀ (he) paratype, ECUADOR, Orellana Prov., Río Shiripuno , Shiripuno Lodge, 26 km SE of Shiripuno bridge (1°6'17''S, 76°43'54''W, 235 m), 23–26 i 2009, D. Wagner, WAH, et al. leg. [ UCMS]; 1 ♀ (an) paratype, ECUADOR, Sucumbíos Prov., Río Cuyabeno , 60 km E Lago Agrio (0°1'54''S, 76 19'15''W, 241 m), 16–26 ii 1998, G. Kareofelas leg. [ ACR]; 1 ♂, 1 ♀ (an) paratypes, PERU, Loreto Dep., Iquitos {3°46'S, 73°15'W, 106 m}, iv 1936, G.G. Klug leg. [ BMNH]; 1 ♀ (an) paratype, same but ii 1936 [ BMNH]; 1 ♀ (an) paratype, same but v 1938 [ BMNH]. GoogleMaps

Specimens examined. 2 ♂, 5 ♀.

Description of male holotype. Labium and rear of head pale yellow; base of mandible pale bluish yellow with a brown spot; labrum yellow with dark brown line along latero-basal margins; gena pale bluish yellow with a brown spot to the side of antefrons; anteclypeus yellow with a pair of medio-lateral brown spots; postclypeus distal half black, basal half brown; antefrons yellowish brown; postfrons and epicranium black with metallic green reflections and orange pale spots and stripes as depicted in Fig. 1t i View FIGURE 1 ; postocular lobes posterior to vertex orange; eyes brown, color in life unknown; postocular lobes rounded. Thorax. Color pattern as described for genus, with middorsal dark stripe on pterothorax black with metallic greenish-blue reflections, wider than inter-laminal sinus, maximum width of 0.50 of mesanepisterna width at 0.30 of pterothoracic length, slightly narrowing posteriorly, extended to mid-length of sides of antealar sinus ( Fig. 3t i View FIGURE 3 ). Pronotum anterior lobe ( Figs 4t i View FIGURE 4 ; 5t i View FIGURE 5 ) smooth; anterior and middle lobes of pronotum separated dorso-laterally by a groove; anterior area of propleuron smooth; dorsum and sides of middle lobe of pronotum smooth; pronotum posterior lobe trilobed, with medial lobe smoothly convex and lateral lobes narrowing to free angled lateral corners, slightly longer than 0.50 of medial lobe. Mesanepisternal horns with bases separated, horns as long as 1.2 times mesostigmal plate width, thin, cylindrical, diverging from each other in posterior view, directed antero-dorsally at an angle of 30° with dorsum in lateral view, ending on a bluntly pointed tip. Wings hyaline, veins reddish brown; Pt sub-rectangular, with anterior and posterior sides longer than distal side, and membrane pale brown margined by pale yellow; 13 pnx in Fw, 12 in Hw. Abdomen. Postmortem background color pale yellow on S1–7, yellowish orange on S8–10; S1 with a reddish brown dorso-posterior spot; dorsum of S2 reddish-brown, of S3–7 dark reddish brown, with a basal pale incomplete ring at anterior edge interrupted by dorso-longitudinal dark line, on S3–6 dark dorsal color posterior to pale transverse spot extended ventrally along sides of lateral terga; dorsum of S8 pale reddish brown along basal 0.75, turning into yellowish orange distally; dorsum of S9 dark reddish brown along basal 0.50, turning into yellowish orange distally; dorsum of S10 reddish-orange; medio-longitudinal carina on sterna brown; caudal appendages orange with black apex. Genital lobe (g.l., Fig. 8t i View FIGURE 8 ) short, less than 0.50 of anterior hamule height, squarish in lateral view, with pronounced anterior and posterior right angles; posterior hamule (p.h.) laminar and large, clearly surpassing ventral margin of genital fossa, slightly higher than anterior hamule (anterior hamule folded inside of genital fossa during preservation), about as wide as width of sclerotized portion of basal segment in ventral view, with a pronounced right angle on posterior margin near its base, and with tip angled at about 90° and triangular in ventral view; curvature of basal segment of genital ligula marked by a deep concave depression, followed by a prominent convex protuberance; genital ligula distal segment pear-shaped, distinctly widened subapically, with ratio maximum width/length of 0.55, apex slightly concave and with a narrow ectal fold (e.f., Fig. 8t i View FIGURE 8 ). Medial portion of S10 postero-dorsal margin ( Figs. 10t i View FIGURE 10 ; 11t i View FIGURE 11 ; 12t i View FIGURE 12 ) projected posteriorly (projection folded ventrally during preservation), lacking a medial incision, with dorsal prominence represented by an entire transverse subapical swelling. Cercus sub-cylindrical, slightly narrowing distally in lateral view ( Fig. 12t i View FIGURE 12 ), with a longitudinal medial concavity, in dorsal view ( Fig. 10t i View FIGURE 10 ) about straight along medial portion, with tip curved medio-ventrally at an angle of about 80°, narrower than medial third of cercus, and ending on a single point directed medio-ventrally; ratio of cercus length to S10 maximum length in lateral view 1.50; ratio of cercus length to paraproct length in lateral view 0.82; paraproct in lateral view sub-cylindrical, of uniform width along medial portion and slightly widening distally, in dorsal view with a medio-longitudinal concavity extended almost to tip, tip curved medially at about 95°, ending on a single ventral tooth.

Dimensions. Hw 22.3; abdomen 38.4; total length 45.9.

Female paratype (Iquitos, iv 1936). Head. As in holotype but anteclypeus pale bluish yellow; pale color of base of mandible and gena pale yellow; base of postclypeus yellow; pattern of epicranium as in Fig. 1t View FIGURE 1 ii.— Thorax. As in holotype but anterior margin of middle lobe with an antero-lateral laminar tongue-like lobe on each side, longer than wide, with rounded tip and posterior surface slightly concave (e-l., Fig. 4t View FIGURE 4 iv); pterothoracic mid-dorsal dark stripe extended alongside entire length of antealar sinus ( Fig. 3t View FIGURE 3 ii); 13 pnx in Fw and Hw; Pt reddish brown.— Abdomen. Color pattern as in holotype; posterior margin of sternum S8 with a bifid process, with a small basal central denticle, lateral prongs spine-shaped and diverging slightly, as long as 0.33 of ovipositor external valve, reaching 0.50 of S9, oriented latero-ventrally to ovipositor ( Fig. 9t View FIGURE 9 ii); ovipositor reaching level of tip of paraproct; caudal appendages and ovipositor external valves reddish brown; stylus dark reddish brown.

Variation in paratypes. Paratypes as holotype but postfrons and epicranium in teneral females metallic green or blue; labrum with dark dendritic marks and eyes pale green with orange medio-posterior area in some paratypes; male paratype with digit-shaped antero-lateral projection on middle lobe of pronotum, about as long as twice its width (Fig. ( Figs. 4t View FIGURE 4 ii; 5t ii), in females tongue-shaped and as long as 2–4 times its width ( Figs. 4t View FIGURE 4 iii–iv; 5t iii–iv); lateral corners of lateral lobes of posterior lobe of pronotum projected latero-dorsally in heteromorphic females ( Figs. 4t View FIGURE 4 iii; 5t iii); mesanepisternal horns directed antero-dorsally at an angle of 10°–30° with dorsum in lateral view, as long as 1.2–1.5 of mesostigmal plate width, to represented by low prominences in heteromorphic females ( Figs. 4t View FIGURE 4 iii; 5t iii); Pt pale yellow to dark reddish brown; rectangular to short rectangular; 12–15 pnx in Fw and 11–14 in Hw; small diffuse pale transverse spot near posterior margin on each side of dorsum of S 2–5 in teneral specimens; pronounced prominence following deep depression on basal segment of genital ligula triangular to rounded in lateral view; small central denticle at base of female S8 bifid process present or absent, lateral prongs straight and diverging slightly to strongly diverging along distal half ( Fig. 9t i View FIGURE 9 ); ovipositor reaching level of tip of paraproct to level of tip of cercus.

Dimensions. Males (n 2, including holotype): Hw 22.4 ± 0.1 [22.3–22.4]; abdomen 38.7 ± 0.4 [38.4–38.9]; total length 46.1 ± 0.2 [45.9–46.2]. Females (n 5): Hw 23.3 ± 0.8 [22.6–24.6]; abdomen 37.5 ± 2.3 [34.2–39.6]; total length 44.8 ± 2.7 [40.8–47.3].

Diagnosis. Metaleptobasis orthogonia is unique by the right angled male genital lobe and posterior hamule: genital lobe is squarish in lateral view, with pronounced anterior and posterior right angles, and posterior hamule, laminar and large and slightly higher than anterior hamule with triangular tip angled at about 90°, has a pronounced right angle on posterior margin near its base ( Fig. 8t i View FIGURE 8 ). In other species, male genital lobe does not have anterior and posterior right angles, being instead smoothly convex, triangular or crescent shaped, and sides of male posterior hamule, when as high as or slightly higher than anterior hamule are straight. Female of M. orthogonia shares only with M. falcifera , M. panguanae , M. peltata , and M. tridentigera the presence of antero-lateral laminar tongue-like lobe on each side of anterior margin of middle lobe of pronotum, and with them and M. gabrielae , posterior margin of S8 sternum with strong spines or processes. The shape of the process, consisting of a bifid projection with a basal central denticle present or absent, lateral prongs spine-shaped and diverging distally, as long as 0.33 of ovipositor external valve, reaching 0.50 of S9, oriented latero-ventrally to ovipositor ( Fig. 9t View FIGURE 9 ), is however unique for M. orthogonia . In M. gabrielae and M. panguanae the spines are also oriented latero-ventrally to ovipositor, but they are separated at their bases ( Figs. 9j, u View FIGURE 9 ), whereas in M. orthogonia the prongs originate from a common base. In M. falcifera , M. peltata , and M. tridentigera the process is trifid, and lateral prongs are scythe-shaped and oriented parallel to the sides of ovipositor in M. falcifera and M. peltata ( Figs. 9g, v View FIGURE 9 ), and laminar and semicircular narrowing distally into a slender spine in M. tridentigera ( Fig. 9 View FIGURE 9 ab).

Females are andromorphic (80%) or heteromorphic (20%), the latter differing from males in shape of pronotum posterior lobe and development of mesanepisternal horns.

Habitat. Found in forests near rivers.

Distribution. Ecuador and Peru ( Fig. 14f).

FSCA

Florida State Collection of Arthropods, The Museum of Entomology

UCMS

University of Connecticut Biodiversity Research Collections