<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> Author Ellenrieder, Natalia Von text Zootaxa 2013 2013-11-25 3738 1 1 155 http://dx.doi.org/10.11646/zootaxa.3738.1.1 journal article 10.11646/zootaxa.3738.1.1 1175-5326 5270552 77D1A6F6-C320-442B-AF31-83324E5EAF3B Metaleptobasis longicauda new species Figs. 1q ; 3q ; 4q ; 5q ; 6b ; 8q ; 9p ; 10q ; 11q ; 12q ; 14d Etymology. From Latin longus (adjective), meaning 'long', and cauda (noun), meaning 'tail', in reference to the unusually long male caudal appendages which characterize this species. Types. ( all * ) Holotype ♂ : BRAZIL , Mato Grosso State , C. Teles Pires , Alto Tapajos { 10°36'16''S , 55°42'26''W }, 1–31 viii 1956 , leg. Sick [ MNRJ ]; 1 ♀ paratype (teneral): BRAZIL , Goiás State , Rio Araguaia , Aruana {17°53''S, 51°43'W , 686 m }, v 1960 , R. von Diringshofen leg. [ MZUSP ] Specimens examined. 1 ♂ , 1 ♀ . Description of male holotype . Labium ivory with a light blue central spot, base of mandible and rear of head ivory; labrum pale yellowish brown with dark brown line along latero-basal margins; eyes brown, color in life unknown; gena pale yellowish brown with a brown spot to the side of antefrons; anteclypeus pale yellowish brown with a pair of diffuse lateral brown spots; postclypeus pale yellowish brown with a dark brown spot on each antero-lateral corner; antefrons brown, postfrons, and epicranium pale yellowish brown with black areas as depicted in Fig. 1q i ; postocular lobes slightly angled. Thorax . Color as described for genus, with mid-dorsal dark stripe on pterothorax black with metallic green reflections, narrower than inter-laminal sinus, as wide as 0.20 of mesanepisterna width, with straight sides, slightly widening posteriorly ( Fig. 3q i ). Pronotum anterior and middle lobes ( Figs. 4q i ; 5q i ) smooth; anterior margin of middle lobe of pronotum very close to posterior margin of anterior lobe dorsally, separated from it by a very narrow fissure (f.); propleuron with an anterior lateral crest formed by ventral portion of anterior lobe lateral margin and a short c-shaped crest posterior to it (l.c.); pronotum posterior lobe trilobed, with medial lobe smoothly convex, and lateral lobes as long as 0.50 of medial lobe length. Mesanepisternal horns with bases adjacent, right horn (left horn broken off near base) slightly longer than twice the length of mesostigmal plate width, of medium thickness, cylindrical, directed antero-dorsally at an angle of 60° with dorsum in lateral view, except for distal portion directed dorso-laterally at about 5° with dorsum, ending on a rounded tip. Wings hyaline, veins pale reddish brown; Pt trapezoidal, with anterior side shorter than distal side, and membrane reddish brown margined by pale brown; 13 pnx in Fw, 12 in Hw. Abdomen . Postmortem background color pale yellow on S1–10; S1 with a reddish brown dorso-posterior spot; dorsum of S2–6 reddish brown, with a basal pale incomplete ring at anterior edge interrupted by a narrow mediolongitudinal reddish brown line, and with a small diffuse pale subapical transverse spot near posterior margin on each side, on S7 dorsum reddish brown across about basal half of segment, gradually fading into yellow background posteriorly, with a basal pale incomplete ring at anterior edge interrupted by a narrow medio-longitudinal reddish brown line; intersegmental membrane on S1–7 dorsally dark reddish brown; cercus orange with apex black; paraproct pale yellow with distal 0.50 brown and apex black. Genital lobe short, less than 0.50 of anterior hamule height, smoothly curved; posterior hamule digit-like 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 0.33, narrower than basal segment, with apex slightly concave, lacking an ectal fold ( Fig. 8q ). Medial portion of male S10 postero-dorsal margin ( Figs. 10q ; 11q ; 12q ) projected posteriorly, with a v-shaped incision with margins thickened forming a dorsal prominence surrounding incision. Cercus sub-cylindrical, of uniform width, slightly and gradually curved medially in dorsal view ( Fig. 10q ), with a sub-apical constriction and tip slightly widened, rounded, with a point directed medio-ventrally; ratio of cercus length to S10 maximum length in lateral view 2; ratio of cercus length to paraproct length in lateral view 1; right paraproct (left paraproct missing) sub-cylindrical, distal 0.66 compressed with an inner concavity, with a sub-apical ridge on inner surface (r., Figs. 10q ; 11q ), about straight and parallel-sided in lateral view ( Fig. 12q ), slightly narrowing distally; tip curved medially at about 90°, sub-quadrate, ending on a single tooth pointed medio-ventrally. Dimensions. Hw 22; abdomen 35.1; total length 43.2. Female paratype . Head . As in holotype but labium, base of mandible, and rear of head pale yellow; pale color of gena, anteclypeus, and antefrons yellow ( Fig. 1q ii ).— Thorax . As in holotype but posterior lobe of pronotum slightly trilobed, with medial lobe narrow and slightly shorter than lateral lobes ( Fig. 4q ii ); mesanepisternal horns represented by short pyramidal bases, directed antero-dorsally at an angle of about 90° with dorsum in lateral view ( Fig. 5q ii ); Pt pale yellow margined with a translucent area; 12 pnx in Fw and Hw.— Abdomen . Color pattern as in holotype but dorsal reddish brown area on S1–3 with a greenish blue metallic reflection; dorsum of S8–10 diffusely reddish brown; medio-longitudinal sternal carina on S1–8 narrowly dark brown; posterior margin of S8 sternum smooth, lacking any denticles, spines, or processes; ovipositor surpassing slightly level of tip of cercus ( Fig. 9p ); stylus and cercus dark reddish brown, epiproct and paraproct yellow. Dimensions. Hw 22.4; abdomen 35.6; total length 42.9. Diagnosis. The male of M. longicauda can be distinguished from all congeners by its long caudal appendages, with both cerci and paraprocts about as long as twice the maximum length of S 10 in lateral view ( Fig. 12q ). Metaleptobasis longicauda 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. silvicola , and M. truncata , and among them, anterior and middle lobes of pronotum separated dorso-laterally by a narrow fissure (f.) only with M. silvicola and M. truncata ( Figs. 5q , aa, ad), vs. separated by a groove (g.) in the other two species ( Figs. 5f, p ). It differs from them by the width of mid-dorsal dark stripe of pterothorax; about 0.20 the width of mesepisterna in M. longicauda ( Fig. 3q ), vs. about 0.33 in M. lillianae ( Fig. 3p ), about 0.25 in M. diceras and M. truncata ( Figs. 3f , ad), and about 0.16 in M. silvicola ( Fig. 3 aa), and further from M. diceras , M. lillianae , and M. silvicola by its trapezoidal Pt, with anterior side shorter than distal side ( Fig. 6b ; vs. Pt rectangular to squarish, Fig. 6a ), from M. diceras and M. silvicola by tip of male cercus sub-cylindrical ( Fig. 12q ; vs. depressed dorso-ventrally, Figs. 12f , aa), from M. truncata by distal third of male paraproct narrower than medial third in lateral view ( Fig. 12q ; vs. wider than medial third, Figs. 12 ad), and from M. lillianae by distal free portion of mesanepisternal horns directed antero-dorsally or reduced ( Fig. 4q ; vs. directed laterally, Fig. 4p ). The only known female is dimorphic in both development of mesanepisternal horns and shape of pronotal posterior margin. Remarks. Condition of holotype and paratype is very poor, both being partially crushed and broken up in numerous fragments. Habitat. Found in forest near rivers. Distribution. Mato Grosso and Goiás States in Brazil ( Fig. 14d ).