Metaleptobasis amazonica Sjöstedt, 1918

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 : 17-18

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-6626-FFA9-D7A8-FE54E0D8FD52
treatment provided by	Felipe
scientific name	Metaleptobasis amazonica Sjöstedt, 1918
status

Treatment

Metaleptobasis amazonica Sjöstedt, 1918 View in CoL

Figs. 1a View FIGURE 1 ; 3a View FIGURE 3 ; 4a View FIGURE 4 ; 5a View FIGURE 5 ; 8a View FIGURE 8 ; 9a View FIGURE 9 ; 10a View FIGURE 10 ; 11a View FIGURE 11 ; 12a View FIGURE 12 ; 14e

Metaleptobasis amazonica Sjöstedt, 1918: 19–21 View in CoL , pl. 1, figs. 1–2 (description of ♂ and ♀, illustrations of male S10);— Santos (1956: 384; diagnosis from M. selysi View in CoL );— Lencioni (2006: 163, figs. 101 A, B; mention from Brazil; reproduction of Sjöstedt’ illustrations);— Cumming (1954: 29; inclusion in key to males);— Daigle (2000: 328; comparison with M. mauffrayi View in CoL );— Heckman (2008: 401; inclusion in key).

Types. ( all *)— Lectotype ♂ *, designated here: BRAZIL: Pará State : Amazonas , Rio Purus, in forest {3°30'S, 57°56'W}, A. Roman leg., x 1914 [ NHRS]; 1 ♂, 1 ♀ paralectotypes *: BRAZIL, Pará State, Amazonas, Rio Autaz, in forest, A. Roman leg. {4°25'S, 59°56'W} [ NHRS]. GoogleMaps

Specimens examined. Total: 2 ♂, 1 ♀.

Lectotype designation for Metaleptobasis amazonica . —To establish the correct application of the name I borrowed the syntypes from NHRS, and in order to preserve stability of nomenclature and ensure a consistent application of the name, I hereby designate the male syntype illustrated ( Figs. 1a i View FIGURE 1 , 3a i View FIGURE 3 , 4a i View FIGURE 4 , 5a i View FIGURE 5 , 8a View FIGURE 8 , 10a View FIGURE 10 , 11a View FIGURE 11 , 12a View FIGURE 12 ), measured, and diagnosed here as lectotype of Metaleptobasis amazonica to act as the unique name-bearing type of this taxon. Original type labels accompanying lectotype are as follows (handwriting in italics): [ Metaleptobasis / ♂ amazonica /n. sp./ Yngve Sjöstedt det.] [Rio Purus] [Amazon Roman] [Okt.] [Type.].

Characterization. Head. Labrum mostly pale; dorsum of head with limited extension of black; postocular lobes rounded ( Fig. 1a View FIGURE 1 ). Thorax: Pronotum ( Figs. 4a View FIGURE 4 ; 5a View FIGURE 5 ) anterior lobe with latero-medial portion of posterior margin projected posteriorly (p-l.), ending adjacent to an antero-dorsal rounded projection of lateral margin of middle lobe of pronotum (e-l.), and fused to it ventrally; anterior and middle lobes of pronotum separated dorsolaterally by a groove; anterior portion of propleuron with a denticulate oblique crest (o.c.); middle lobe anterior margin smooth; pronotum posterior lobe in male and female trilobed with medial lobe smoothly convex and lateral lobes about as long as (males) or slightly longer than (female) 0.50 of medial lobe length; mesanepisternal horns about as long as mesostigmal plate width in male, half the width of a mesostigmal plate in female, of medium thickness, diverging antero-dorsally, in male at an angle of about 45° with dorsum in lateral view, in female of about 85°, with bases joined by a low ridge to separated and with tips rounded; mid-dorsal dark stripe narrow, as wide as about 0.14–0.16 of mesepisterna, widening slightly and gradually posteriorly, with sides straight ( Fig. 3a View FIGURE 3 ); Pt sub-rectangular, with anterior and posterior sides longer than distal side. Abdomen: Male genital lobe short, less than 0.50 of anterior hamule height, smoothly curved; male posterior hamule digit-like and small, with at most only tip surpassing ventral margin of genital fossa in lateral view ( Fig. 8a View FIGURE 8 ); curvature of basal segment of genital ligula marked by a slight concave depression; genital ligula distal segment sub-quadrate, apex transverse lacking an ectal fold ( Fig. 8a View FIGURE 8 ); posterior margin of female S8 sternum smooth; distal end of ovipositor reaching level of apex of paraproct ( Fig. 9a View FIGURE 9 ); medial portion of male S10 postero-dorsal margin ( Figs. 10a View FIGURE 10 ; 11a View FIGURE 11 ; 12a View FIGURE 12 ) projected posteriorly, with a small u-shaped incision and a prominence surrounding the incision; male cercus in dorsal view arched medially with a uniform curvature, narrowing to tip ( Fig. 10a View FIGURE 10 ); tip with a slight dorsal concavity at apex, ending on a single incurved tooth ( Figs. 10a View FIGURE 10 ; 11a View FIGURE 11 ); ratio of male cercus length to S10 maximum length in lateral view 0.60–0.62; ratio of male paraproct length to S10 maximum length in lateral view about 1; male paraproct in lateral view narrowing distally ( Fig. 12a View FIGURE 12 ), with sides arched, and tip with medial surface smooth and ending in an apical tooth.

Dimensions. Males (n 2, second measurement in range corresponds to lectotype): Hw 21.8 [21.8 ± 0.0]; abdomen 35.5–37.4 [36.45 ± 1.34]; total length 43.8–45.3 [44.55 ± 1.06]. Female (n 1): Hw 22.9; abdomen 37.2; total length 45.7.

Diagnosis. Male and female are unique among all known species of the genus by the combination of postero-lateral projections on pronotum anterior lobe and antero-dorsal projections on pronotum middle lobe (p-l. & e-l. in Figs. 4a View FIGURE 4 ; 5a View FIGURE 5 ). No other species combines projections on both lobes; i.e. in M. bicornis and M. prostrata the latero-ventral corners of pronotum anterior lobe project postero-ventrally, in females of M. gibbosa they project ventrally, and in females of M. foreli the latero-dorsal corners project posteriorly, but there are no antero-dorsal projections on middle lobe of pronotum. Antero-lateral or antero-dorsal projections on middle lobe of pronotum in females or in both sexes are present in M. falcifera , M. guillermoi , M. mauffrayi , M. orthogonia , M. panguanae , M. peltata , and M. tridentigera , but anterior lobe of pronotum is devoid of projections in all of them.

The only known female is dimorphic in the morphology of mesanepisternal horns (ca 0.50 as long as male horns and oriented at a different angle).

Remarks. Sjöstedt (1918) listed the material examined as one male and two females. However, he provided a range of measurements for males on his table in page 21 and the type labels in his handwriting associated with the specimens agree with the sex of the specimens. Hence, the female sign for the specimen from Rio Purus under the list of material in his paper ( Sjöstedt, 1918) was most likely a misprint.

Habitat. Forests near rivers.

Distribution. Pará State in Brazil ( Fig. 14e).