Metaleptobasis silvicola, Ellenrieder, 2013

Ellenrieder, Natalia Von, 2013, A revision of Metaleptobasis Calvert (Odonata: Coenagrionidae) with seven synonymies and the description of eighteen new species from South America , Zootaxa 3738 (1), pp. 1-155 : 69-71

publication ID	https://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-6672-FFFE-D7A8-FA35E024FD0A
treatment provided by	Felipe
scientific name	Metaleptobasis silvicola
status	sp. nov.

Treatment

Metaleptobasis silvicola View in CoL new species

Figs. 1 View FIGURE 1 aa; 3aa; 4aa; 5aa; 8aa; 9z; 10aa; 11aa; 12aa; 13k; 14d

Metaleptobasis manicaria View in CoL nec Williamson, 1915 — Paulson (1985: 12; mention).— Misidentification.

Etymology. From Latin silvicola (adjective), meaning 'inhabiting woodlands, sylvan', in reference to the habitat at which the type specimens were found.

Types. ( all *) Holotype ♂: PERU, Madre de Dios Dep., Explorer's Inn on Río Tambopata , 30 km SW Puerto Maldonado, main trail {12°50'18''S, 69°17'59''W, 300 m}, 1 viii 1979, M. Perkins & P. Donahue leg. [ FSCA]; 1 ♀ (an), same data as holotype but 39 km SW Puerto Maldonado, main trail, 21 vii 2002, D.R. Paulson & N. Smith leg. [ DRP]; 1 ♀ (he), same data as holotype but Tambopata-Candamo Reserved Zone {12°50'12''S, 69°17'36''W, 300 m}, 28 iv 1986 [ LB]; 1 ♀ (he) same data but 11 vii 2008, TF [ TF]. GoogleMaps

Specimens examined. 1 ♂, 3 ♀.

Description of male holotype. Labium and rear of head ivory; base of mandible pale bluish brown; labrum pale yellow with dark brown line along latero-basal margins; gena pale bluish brown with a brown spot to the side of antefrons; anteclypeus pale yellow with a pair of diffuse lateral brown spots; postclypeus pale bluish brown with a dark brown spot on each antero-lateral corner; antefrons pale bluish brown; postfrons and epicranium pale bluish brown with black areas as depicted in Fig. 1 View FIGURE 1 aa i and area posterior to occipital bar orange; eyes brown, color in life unknown; postocular lobes slightly angled. Thorax. Color as for genus, with mid-dorsal dark stripe on pterothorax black with metallic green reflections, narrower than inter-laminal sinus, as wide as 0.16 of mesanepisterna width, with straight sides, slightly widening posteriorly ( Fig. 3 View FIGURE 3 aa i). Pronotum anterior and middle lobes smooth; anterior margin of middle lobe of pronotum very close to posterior margin of anterior lobe dorso-laterally, separated from it by a very narrow fissure, and fused to it laterally; anterior area of propleuron with an anterior sub-vertical ridge formed by anterior lobe lateral margin projected antero-ventrally and a sub-vertical c-shaped crest posterior to it (l.c.; Fig. 5 View FIGURE 5 aa i); pronotum posterior lobe trilobed, with medial lobe smoothly convex, and lateral lobes entire and smoothly convex, shorter than medial lobe, with lateral corners rounded ( Fig. 4 View FIGURE 4 aa i). Mesanepisternal horns with bases adjacent, as long as 2 times mesostigmal plate width, of medium thickness, cylindrical, directed anterodorsally at an angle of 45° 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 yellow margined by ivory; 12 pnx in Fw, 12 (right) and 11 (left) in Hw. Abdomen. Postmortem background color pale yellow on S1–10; S1 with a pale diffuse reddish brown dorso-posterior spot; dorsum of S2–7 pale reddish brown, with a basal pale yellow incomplete ring at anterior edge interrupted by a narrow medio-longitudinal pale reddish brown line, and with a small diffuse pale yellow subapical transverse spot near posterior margin on each side, of S8–10 diffusely pale brown on medio-longitudinal basal area; intersegmental membrane on S1–7 dorsally reddish brown; cercus reddish brown with apex black; paraproct pale yellow with distal 0.30 reddish brown and apex black. Genital lobe short, less than 0.50 of anterior hamule height, smoothly curved; posterior hamule digitlike and small, shortly surpassing ventral margin of genital fossa in lateral view; curvature of basal segment of genital ligula marked by a slight concave depression; genital ligula distal segment sub-rectangular, with ratio maximum width/length of 0.30, narrower than basal segment, with apex slightly concave, lacking an ectal fold ( Fig. 8 View FIGURE 8 aa). Medial portion of S10 postero-dorsal margin ( Figs. 10 View FIGURE 10 aa; 11aa; 12aa) projected posteriorly, with a longitudinal incision with margins thickened and apressed, forming a dorsal prominence surrounding incision. Cercus subcylindrical, slightly and gradually curved medially in dorsal view ( Fig. 10 View FIGURE 10 aa), narrowing slightly to tip, which is slightly depressed dorso-ventrally, and ends on a single tooth directed medio-ventrally; ratio of cercus length to S10 maximum length in lateral view 1.1; ratio of cercus length to paraproct length in lateral view 0.50; paraproct subcylindrical, distal 0.66 compressed with an inner concavity, medio-ventral margin with two sub-apical longitudinal ridges on medial surface (rs.; Figs. 10 View FIGURE 10 aa; 11aa); in lateral view ( Fig. 12 View FIGURE 12 aa) about straight and parallel-sided along mid-length, slightly widening and curved ventrally at distal 0.25, with tip sub-quadrate; in dorsal view with a single triangular medio-ventral tooth (s.t.; Figs. 10 View FIGURE 10 aa; 11aa).

Dimensions. Hw 21.3; abdomen 35.9; total length 43.7.

Female paratype (same locality as holotype, an). Head. As in holotype but labrum with dark dendritic marks ( Fig. 1 View FIGURE 1 aa ii); pale color of gena, anteclypeus, and antefrons pale yellow, of postclypeus, postfrons, and epicranium pale brown; eyes in life green dorsally and pale brown ventrally ( Fig. 13k View FIGURE 13 ).— Thorax. As in holotype ( Figs. 3 View FIGURE 3 aa ii; 4aa ii; 5aa iii) but Pt short rectangular, with anterior and posterior sides slightly longer than distal side; 13 pnx in Fw, 12 in Hw.— Abdomen. Color pattern as in holotype but medio-longitudinal sternal carina on S2–8 narrowly black; posterior margin of S8 sternum smooth, lacking any denticles, spines, or processes ( Fig. 9 View FIGURE 9 aa); ovipositor surpassing slightly level of tip of cercus; cerci reddish brown, epiproct, and paraprocts pale brown, and ovipositor valves yellow.

Variation in female paratypes (he). As holotype but color of head as in female paratype, one paratype with and one without dendritic black marks on labrum; Pt yellow margined by reddish brown, posterior lobe of pronotum with medial lobe as long as or slightly shorter than medial lobe ( Fig. 4 View FIGURE 4 aa iii); mesanepisternal horns represented by short sub-rectangular bases, as long as 0.33 of mesostigmal plate, directed antero-dorsally at an angle of 90° with dorsum in lateral view ( Fig. 5 View FIGURE 5 aa ii); paraproct pale brown to yellow; ovipositor yellow to pale blue; stylus dark reddish brown.

Dimensions. Females (n 3): Hw 22.6 ± 0.4 [22.2–23]; abdomen 36.5 ± 0.3 [36.2–36.8]; total length 44.2 ± 0.3 [43.9–44.4].

Diagnosis. Metaleptobasis silvicola shares the combination of head dorsum with black pattern limited to isolated stripes, base of mesanepisternal horns adjacent, and two sub-vertical crests on anterior area of propleuron only with M. diceras , M. lillianae , M. longicauda , and M. truncata , and among them, anterior and middle lobes of pronotum separated dorso-laterally by a narrow fissure only with M. longicauda and M. truncata (f; Figs. 4q View FIGURE 4 , aa, ad; 5q, aa, ad; vs. separated by a groove, Figs. 4f, p View FIGURE 4 ; 5f, p View FIGURE 5 ). It differs from them by the width of mid-dorsal dark stripe of pterothorax, about 0.16 the width of mesepisterna ( Fig. 3 View FIGURE 3 aa; vs. about 0.25 in M. diceras and M. truncata , about 0.33 in M. lillianae , about 0.20 in M. longicauda ; Figs. 3f, p, q View FIGURE 3 , ad), and further from M. longicauda and M. truncata by its rectangular Pt (as in Figs. 6a View FIGURE 6 ; vs. trapezoidal Pt, with anterior side shorter than distal side, Figs. 6b–c View FIGURE 6 ), by tip of male cercus depressed dorso-ventrally ( Fig. 11 View FIGURE 11 aa; vs. sub-cylindrical, Figs. 11q View FIGURE 11 , ad), from M. diceras by sub-rectangular shape of distal segment of genital ligula ( Fig. 8 View FIGURE 8 aa; vs. pear-shaped, Fig. 8f View FIGURE 8 ), male cercus narrowing gradually distally in dorsal view ( Fig. 10 View FIGURE 10 aa; vs. widened sub-apically, Fig. 10f View FIGURE 10 ), and male paraproct medial surface with two sub-apical ridges (rs.) and ending on a single medio-ventral tooth (s.t.; Figs. 10 View FIGURE 10 aa; 11aa; vs. with one sub-apical ridge (r.) and ending on a bicuspidate tooth (b.t.), Figs. 10f View FIGURE 10 ; 11f View FIGURE 11 ), and from M. lillianae by distal free portion of horns directed antero-dorsally or reduced ( Figs. 4 View FIGURE 4 aa; 5aa; vs. directed laterally, Figs. 4p View FIGURE 4 ; 5p View FIGURE 5 ), and male cercus curved medially in dorsal view ( Fig. 10 View FIGURE 10 aa; vs. about straight, Fig. 10p View FIGURE 10 ).

All known females share shape of pronotal posterior margin with male, and can be dimorphic (67%) or not (33%) in the development of mesanepisternal horns.

Habitat. Forest.

Distribution. SE Peru ( Fig. 14d).