Metaleptobasis prostrata, 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: 64-65

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Metaleptobasis prostrata

new species

Metaleptobasis prostrata   new species

Figs. 1x View FIGURE 1 ; 2x View FIGURE 2 ; 3x View FIGURE 3 ; 4x View FIGURE 4 ; 5x View FIGURE 5 ; 8x View FIGURE 8 ; 9w View FIGURE 9 ; 10x View FIGURE 10 ; 11x View FIGURE 11 ; 12x View FIGURE 12 ; 14c

Etymology. From Latin prostratus (verb, past participle), meaning 'stretched out, prostrated', in reference to the mesanepisternal horns spread forward horizontally, resembling outstretched arms.

Types. ( all *) Holotype ♂: PERU, Junín Dep., Satipo {11°16'S, 74°41'W, 714 m}, v 1945, P. Paprzycki leg. [ UMMZ]; 5 ♂ paratypes, 1 ♀ paratype: same data as holotype [ UMMZ]; 1 ♂: same data but xi 1944, P. Paprzycki leg. [ CAS]; 2 ♂ paratypes: same but iii 1945 [ UMMZ]; 1 ♂ paratype: Tarma, Vitoc {11°12'S, 75°21'W, 923 m}, 10 xi 1940, F. Woytkowski leg. [ RWG]; 1 ♂ paratype, teneral: ECUADOR, Sucumbíos, swamp-stream 7 km W of Lago Agrio {0°5'N, 76°59'W, 280 m}, 8 vi 1995, S.W. Dunkle leg. [ RWG]. GoogleMaps  

Specimens examined. Total: 11 ♂, 1 ♀.

Description of male holotype. Head. Labium and rear of head ivory; labrum pale yellowish blue with narrow brown line along latero-basal margins; base of mandible pale yellowish blue; anteclypeus pale yellowish blue with a pair of latero-medial brown spots; gena pale blue with a small dark brown spot lateral to antefrons; postclypeus and antefrons pale blue; epicranium brown with black line over epicranial suture and black spots as depicted in Fig. 1w i View FIGURE 1 ; eyes brown, color in life unknown; postocular lobes rounded. Thorax. Color as described for genus, with middorsal dark stripe black with metallic greenish-blue reflections, about as wide as inter-laminal sinus, 0.33 of mesanepisterna width, parallel sided along mid-section and slightly narrowing at posterior end ( Fig. 3x i View FIGURE 3 ). Pronotum anterior lobe ( Figs. 4x i View FIGURE 4 ; 5x i View FIGURE 5 ) with lateral margin projected postero-ventrally forming a smooth L-shaped ridge (l-v.p.); anterior and middle lobes of pronotum separated dorso-laterally by a groove; anterior area of propleuron with a prominent rounded tubercle (t.) which apex forms a short crest ventrally and very close to L-shaped ridge; middle lobe of pronotum smooth; pronotum posterior lobe slightly trilobed, with medial lobe bluntly pointed and lateral lobes entire and slightly longer than 0.50 of medial lobe length. Mesanepisternal horns with bases separated, arising at level of mesanepisternal plate bases, well developed, slightly longer than mesostigmal plate width, thin and diverging, narrowing to bluntly pointed apex, directed antero-laterally at an angle of 15° with dorsum in lateral view. Wings hyaline, veins dark brown; Pt trapezoidal, with anterior side shorter than distal side, with membrane pale brown margined by pale yellow; 12 pnx in Fw, 11 (right) and 12 (left) in Hw. Abdomen. Postmortem background color pale yellow on S1–2, 8–10, pale bluish yellow on S3–7; S1 with a pale brown dorsoposterior spot and ventral carina of lateral tergum margined with black; S2 and S7 with dark reddish-brown dorsum and S3–6 with black dorsum, with a basal pale incomplete ring at anterior edge interrupted by dorso-longitudinal dark line, and with a small diffuse pale transverse spot near posterior margin on each side, on S3–6 dark dorsal color posterior to pale transverse spot extended ventrally along sides of lateral terga; dorsum of S8–9 pale brown anteriorly turning into reddish yellow at posterior 0.33 and 0.50 respectively; dorsum of S10 reddish yellow with pale brown posterior diffuse spot; sterna medio-longitudinal carina black; cercus and paraproct reddish brown with 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 0.40, narrower than opposing basal portion, with apex slightly concave, lacking an ectal fold (e.f., Fig. 8x View FIGURE 8 ). Medial portion of S10 postero-dorsal margin ( Figs. 10x View FIGURE 10 ; 11x View FIGURE 11 ; 12x View FIGURE 12 ) projected posteriorly, with a small u-shaped incision, and dorsal prominence curved surrounding incision. Cercus in dorsal view ( Fig. 10x View FIGURE 10 ) subcylindrical, gradually narrowing distally, tip curved medially at 90° angle in dorsal view, slightly depressed dorsoventrally, ending on single small tooth directed medio-ventrally; ratio of cercus length to S10 maximum length in lateral view 1; ratio of cercus length to paraproct length in lateral view 0.67; paraproct with base sub-cylindrical, distal 0.66 compressed with an inner concavity, of uniform width along distal half in lateral view ( Fig. 12x View FIGURE 12 ); tip slightly curved ventrally, with a sub-apical ridge on medial surface ending on a small incurved pointed tooth.

Dimensions. Hw 21.2; abdomen 37.5; total length 44.7.

Female paratype. Head. As in holotype pale areas yellow; labrum with branching pattern of dark lines; postclypeus brown; epicranium brown with black line over epicranial suture and black spots as depicted in Fig. 1x View FIGURE 1 ii; eyes brown, color in life unknown.— Thorax. As in holotype ( Fig. 3x View FIGURE 3 ii) but medial lobe of pronotum posterior lobe with medial lobe bilobed, and lateral lobes slightly shorter than medial lobe length ( Figs. 4x View FIGURE 4 ii; 5x ii); 12 pnx in Fw and Hw.— Abdomen. Color pattern as in holotype but ventral carina of lateral tergum S1–2 margined with black, dark dorsum on S1–3 with metallic green reflections; posterior margin of S8 sternum smooth ( Fig. 9w View FIGURE 9 ), lacking any denticles, spines, or processes; external valve of ovipositor pale with dark reddish brown stylus; ovipositor slightly surpassing tip of cercus; caudal appendages reddish brown.

Variation in paratypes. Head. As in holotype but labrum with branching pattern of dark lines, postclypeus brown, and epicranium dark brown in several specimens; teneral specimen with black postocular spots. Thorax. As in holotype but mesanepisternal horns as long as 1.0–1.2 of mesostigmal plate width, forming an angle of 0°–15° with dorsum ( Figs. 4x View FIGURE 4 ; 5x View FIGURE 5 ); pnx Fw 11–13; pnx Hw 11–13; Pt from trapezoidal to squarish with all sides about equal, to short rectangular with anterior and posterior sides slightly longer than distal side. Abdomen. Dark areas on dorsum of abdominal segments as in holotype, but small diffuse pale transverse spot near posterior margin on each side of S2–7 present or absent in some or all segments.

Dimensions. Males (n 10, excluding holotype): Hw: 21.1 ± 0.6 [20.1–22]; abdomen: 37.3 ± 1 [35.8–38.6]; total length: 44.4 ± 1 [42.9–45.8].

Diagnosis. Metaleptobasis prostrata   shares lateral margin of anterior lobe extending postero-ventrally forming a ridge (l-v.p.) ending opposite an anterior tubercle on propleuron (t.) only with M. bicornis   ( Figs. 4x View FIGURE 4 ; 5x View FIGURE 5 ), from which it differs by medio-lateral portions of anterior lobe of pronotum with posterior margin lacking a marginal crest (with a marginal crest in M. bicornis   , cr., Figs. 2a View FIGURE 2 ; 4b View FIGURE 4 ; 5b View FIGURE 5 ), mesanepisternal horns oriented anterolaterally at an angle of 0°–15° with dorsum in males and females (oriented antero-dorsally at an angle of 45° with dorsum in males and andromorphic females, or oriented laterally or represented only by bases in heteromorphic females in M. bicornis   ), and distal portion of male cercus sub-cylindrical and gradually narrowing distally ( Fig. 10x View FIGURE 10 ; depressed dorso-ventrally and widened sub-apically in M. bicornis   , Fig. 10b View FIGURE 10 ). It resembles M. brevicauda   in orientation, point of origin, and development of mesanepisternal horns, but differs from it by lateral margin of anterior lobe extending postero-ventrally forming a ridge ( Fig. 5x View FIGURE 5 ; lateral margin of anterior lobe not forming a ridge in M. brevicauda   , Fig. 5d View FIGURE 5 ) and male paraproct longer than cercus ( Fig. 12x View FIGURE 12 ; shorter than 0.50 of cercus in M. brevicauda   , Fig. 12d View FIGURE 12 ).

The only known female shares development of mesanepisternal horns with males, and differs in shape of posterior lobe of pronotum.

Habitat. Forest near swamps and streams.

Distribution. Sucumbíos Prov. in Ecuador and Junín Dep. in Peru ( Fig. 14c).


University of Michigan, Museum of Zoology


California Academy of Sciences