Metaleptobasis tridentigera, 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 : 73-75

Metaleptobasis tridentigera new species

Figs. 1 ac; 3ac; 4ac; 5ac; 8ac; 9ab; 10ac; 11ac; 12ac; 14f

Etymology. From Latin tridentis (noun), and gero (verb), meaning 'one carrying a trident', referring to the unique three-pronged process on posterior margin of female sternum S8 which resembles a trident.

Types. ( all *)— Holotype ♂: BRAZIL, Rondônia State, Porto Velho, Area Abunan, T 11 Aleatorio (8°46'S, 63°54'W, 86 m), 16 v 2010, Nogueira & Mendes leg. [ MZUSP]; 1 ♂ paratype: BRAZIL, Amazonas State, Novo Airão, pool in trail (2°42'41''S, 60°55'5''W), 12 viii 2008, U. Neiss leg. [ INPA]; 1 ♂ paratype: same data but ramal madeireiro km 10 [ INPA]; 1 ♂ paratype, same data but [ RWG]; 1 ♂ paratype: BRAZIL, Amazonas State, Manacapuru, Igarapé Sítio Apaixonados, km 21 (3°8'22''S, 60°43'51''W), 27 iii 2008, U. Neiss leg. [ RWG]; 1 ♂ paratype (teneral, missing S8 and paraprocts): BRAZIL, Pará State, Jacareacanga (6°16'S, 57°39'W, 88 m), iv 1969, F.R. Barbosa leg. [ UMMZ]; 1 ♀ paratype, BRAZIL: Rondônia State, Fazenda Rancho Grande, 62 km SW of Ariquemes (10°31'48''S, 62°48'0''W, 165 m), 14–25 xi 1993, J. Wiseman leg. [ RWG]; 1 ♀ paratype, same data but Line 20, Lots 21, 23, 25, 7 x 1993, C.A. Bridges leg. [ RWG].

Specimens examined. 6 ♂, 2 ♀.

Description of male holotype. Labium and rear of head ivory; base of mandible pale yellow with a brown spot; labrum yellowish orange with dark brown line along latero-basal margins and distal margin yellow; gena pale greenish yellow with a brown spot to the side of antefrons; anteclypeus pale yellow with a pair of medio-lateral brown spots; postclypeus distal half black, basal half brown; antefrons pale bluish yellow; postfrons and epicranium black with metallic green reflections and pale spots and stripes as depicted in Fig. 1 ac i; postocular lobes posterior to vertex yellowish orange; eyes pale brown, color in life unknown; postocular lobes rounded. Thorax. Color as described for genus, with mid-dorsal dark stripe on pterothorax black with metallic greenish-blue reflections, wider than inter-laminal sinus, maximum width at 0.30 of pterothoracic length of 0.50 of mesanepisterna width, parallel sided posteriorly, extended along sides of antealar sinus ( Fig. 3 ac i). Pronotum anterior lobe smooth; anterior and middle lobes of pronotum separated dorso-laterally by a groove; anterior area of propleuron smooth; dorsum of middle lobe of pronotum smooth; anterior margin of middle lobe with an anterolateral laminar tongue-like lobe on each side, longer than wide, with rounded tip and posterior surface slightly concave (as in Figs. 4 ac ii; 5ac i); pronotum posterior lobe trilobed, with medial lobe smoothly convex and lateral lobes narrowing to angled lateral corners, slightly longer than 0.50 of medial lobe. Mesanepisternal horns with bases separated, horns as long as 1.5 times mesostigmal plate width, thin, cylindrical, slightly diverging from each other in posterior view, directed antero-dorsally at an angle of 45° with dorsum in lateral view, ending on a bluntly pointed tips. Wings hyaline, veins reddish brown; Pt short rectangular, with anterior and posterior sides slightly longer than distal side, and membrane yellow margined by white; 12 pnx in Fw and 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 pale reddish-brown, of S2–7 dark reddish-brown, 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 S2, on S3–6 dark dorsal color extended ventrally along sides of lateral terga sub-apically to posterior margin; dorsum of S8 dark reddish brown along basal 0.75, gradually turning into yellowish orange distally; dorsum of S9 dark reddish brown along basal 0.50, gradually turning into yellowish orange distally; dorsum of S10 reddish-orange; S2–9 with denticles along postero-lateral margin, very small in S2–6, larger in S7–9; caudal appendages orange with black apex. Genital lobe slightly almost as high as 0.50 of anterior hamule height, smoothly curved; posterior hamule laminar and large, clearly surpassing ventral margin of genital fossa, higher than anterior hamule, as wide as width of sclerotized portion of basal segment, with sides straight, 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 sub-apically, with ratio maximum width/length of 0.70, apex slightly concave with a narrow ectal fold ( Fig 8 ac i). Medial portion of S10 postero-dorsal margin ( Figs. 10 ac i; 11ac i; 12ac i) projected posteriorly, lacking a medial incision, with dorsal prominence represented by an entire transverse sub-apical swelling. Cercus sub-cylindrical, slightly narrowing distally in lateral view ( Fig. 12 ac i), with a longitudinal medial concavity, in dorsal view ( Fig. 10 ac i) about straight along basal 0.70, 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 1.2; ratio of cercus length to paraproct length in lateral view 0.75; paraproct subcylindrical, with a slight medial constriction and slightly widened distally in lateral view, with a medio-longitudinal concavity, tip curved medially at about 95°, ending on a single ventral tooth.

Dimensions. Hw 23; abdomen 38.3; total length 45.6.

Female paratype (collected 7 x 1993). Head. As in holotype but labrum and basal half of postclypeus pale orange-brown; antefrons pale yellow.— Thorax. As in holotype but lateral lobes of posterior lobe of pronotum dorsally globose (as in Figs. 4 ac iv; 5ac ii), mesanepisternal horns vestigial, their position indicated by very low blunt prominence; 14 (right) and 13 (left) pnx in Fw, 12 (right) and 13 (left) pnx in Hw.— Abdomen. Color pattern as in holotype; posterior margin of S8 sternum with a trifid process, with medial prong spine-like and as long as 0.33 of lateral prongs, lateral prongs parallel to sternum, as long as 0.50 of ovipositor external valve and reaching posterior margin of S9, sub-triangular with medial margin straight and narrowing distally into a slender long needleshaped spine (as in Fig. 9 ab i); ovipositor reaching level of tip of cercus; caudal appendages pale orange brown; ovipositor external valves yellowish orange.

Variation in paratypes. Paratypes as holotype but pale color of frontal surface of head pale yellow to pale yellowish green to pale bluish grey; antero-lateral projection of middle lobe of pronotum tongue-shaped and as long as in holotype to about 0.33 of its length and digit-shaped ( Fig. 4 ac i); mesanepisternal horns as long as about 1.2–1.5 of mesostigmal plate width; one paratype with wings infumated in brown along veins; Pt pale yellow to dark reddish brown; squarish to short rectangular; 11–13 pnx in Fw and Hw; small diffuse pale transverse spot near posterior margin on each side of dorsum from S2–5; pronounced prominence following deep depression on basal segment of genital ligula triangular to rounded in lateral view; medial rounded projection of postero-dorsal margin of male S10 sometimes folded ventrally during preservation ( Fig. 12 ac ii); male cercus tip curved medio-ventrally at an angle of 90° ( Fig. 10 ac i) to curved gradually to tip ( Fig. 10 ac ii); ratio of cercus length to S10 maximum length in lateral view 1.1–1.4; ratio of cercus length to paraproct length in lateral view 0.75–0.80; paraproct tip curved medially at 90°–145° ( Fig. 11 ac); ovipositor reaching level of tip of paraproct; stylus brown.

Dimensions. Males (n 6, including holotype): Hw 22.4 ± 0.5 [21.6–23]; abdomen (n 5) 38.2 ± 0.5 [37.4–38.9]; total length (n 5) 45.6 ± 0.7 [44.4–46.3]. Females (n 2): Hw 24.4 ± 0.7 [23.9–24.9]; abdomen 38.3 ± 1.3 [37.3– 39.2]; total length (n 4) 45.8 ± 1.4 [44.8–46.8].

Diagnosis. Shape of male posterior hamule (higher than anterior hamule, narrow, being about as wide as width of sclerotized portion of genital ligula basal segment in ventral view, with sides straight, with tip angled at about 90° and triangular in ventral view; Fig. 8 ac), and of female sternal process of S8 (trifid, with medial prong spinelike and as long as 0.33 of lateral prongs, lateral prongs parallel to sternum, semicircular with medial margin straight and narrowing distally into a slender long needle-shaped spine; Fig. 9 ab), are unique for M. tridentigera and allow recognition from all congeners. In M. falcifera , M. orthogonia , and M. peltata , male posterior hamule is also as high or higher than anterior hamule and its tip is bent at about 90°, but in M. falcifera hamule axis is wide, about 1.5 times as wide as width of sclerotized portion of genital ligula basal segment in ventral view, in M. orthogonia its posterior surface is angled, and in M. peltata its tip is rounded in ventral view ( Figs. 8g, t, w ), and female sternal process of S8 is bifid, or if trifid, lateral prongs are oriented parallel to sides of ovipositor ( Figs. 9g, t, v ). It further differs from M. orthogonia and M. peltata by posterior hamule as high as 0.50 of anterior hamule height (vs. shorter than 0.50 of anterior hamule height or as high as anterior hamule height, Figs. 8t, w ), and also from M. falcifera by distal portion of cercus narrower than its medial portion in dorsal view ( Fig. 10 ab; vs. about as wide as medial portion in M. falcifera , Fig. 10g ). Female of M. tridentigera shares only with M. falcifera , M. orthogonia , M. panguanae , and M. peltata the presence of antero-lateral laminar tongue-like lobes on each side of anterior margin of middle lobe of pronotum, and only with M. falcifera and M. peltata posterior lobe of pronotum with dorsally globose lateral lobes.

Both known females are dimorphic in the development of mesanepisternal horns and shape of pronotum posterior lobe.

Habitat. Forest trails and pools.

Distribution. Rondônia, Amazonas, and Pará States in Brazil ( Fig. 14f).

Figures

FIGURE 1. Head, dorsal view. (a) i. M. amazonica, male lectotype; (a) ii. M. amazonica, female paralectotype; (b) i. M. bicornis, male, Surinam, Kabalebo; (b) ii. M. bicornis, male, French Guiana, N of Cayenne; (b) iii. M. bicornis, female, Surinam, Commewetane; (c) i. M. bovilla, male, Costa Rica, La Selva; (c) ii. M. bovilla, female, same data; (d) i. M. brevicauda, male holotype; (d) ii. M. brevicauda, female paratype, Peru, Tingo María; (e) i. M. brysonima, male, paratype of M. incisula, Venezuela, Marawaka; (e) ii. M. brysonima, female, paratype of M. incisula, same data; (e) iii. M. brysonima, female, holotype of M. weibezahni; (e) iv. M. brysonima, female, holotype of M. tetragena; (f) i. M. diceras, male lectotype; (f) ii. M. diceras, male, Brazil, Abuna; (f) iii. M. diceras, female paralectotype; (f) iv. M. diceras, female, holotype of M. fernandezi; (f) iv. M. diceras, female, Venezuela, no locality; (f) v. M. diceras, female, Brazil, Abuna; (g) i. M. falcifera, male holotype; (g) ii. M. falcifera, female paratype, Peru, Pakitza; (h) i. M. foreli, male, Colombia, Puerto Berrio; (h) ii. M. foreli, male, paratype of M. westfalli, Panama, No. 5 on Standley, 22 vii 1950, FSCA; (h) iii. M. foreli, female, same data.

FIGURE 3. Pterothorax, dorsal view. (a) i. M. amazonica, male lectotype; (a) ii. M. amazonica, female paralectotype; (b) i. M. bicornis, male, French Guiana, N of Cayenne; (b) ii. M. bicornis, male, Surinam, Kabalebo; (b) iii. M. bicornis, female, Surinam, Moengotapoe; (b) iv. M. bicornis, female, Surinam, Commewetane; (c) i. M. bovilla, male, Costa Rica, La Selva; (c) ii. M. bovilla, female, same data; (d) i. M. brevicauda, male holotype; (d) ii. M. brevicauda, female paratype, Peru, Tingo María; (e) i. M. brysonima, male, paratype of M. incisula, Venezuela, Marawaka; (e) ii. M. brysonima, female, paratype of M. incisula, same data.

FIGURE 4. Prothorax and anterior portion of pterothorax, dorsal view. (a) i. M. amazonica, male lectotype; (a) ii. M. amazonica, male paralectotype; (a) iii. M. amazonica, female paralectotype; (b) i. M. bicornis, male, Surinam, Kabalebo; (b) ii. M. bicornis, male, Brazil, Paranapuebas; (b) iii. M. bicornis, male, French Guiana, N of Cayenne; (b) iv. M. bicornis, male, Guyana, Potaro; (b) v. M. bicornis, male, Trinidad, Cumuto; (b) vi. M. bicornis, female holotype. o.c.: oblique crest; cr.: crest; e-l.: ear-lobe; l-v. p.: latero-ventral projection; p.l.: postero-lateral projection; t.: tubercle.

FIGURE 8. Genital ligula, lateral view (above) and ventral view (below). (a) M. amazonica, lectotype; (b) i. M. bicornis, Surinam, Kabalebo; (b) ii. M. bicornis, French Guiana, N of Cayenne; (c) i. M. bovilla, Costa Rica, La Selva; (c) ii. M. bovilla, same data; (d) M. brevicauda, holotype; (e) i. M. brysonima, paratype of M. incisula, Venezuela, Marawaka; (e) ii. M. brysonima, Peru, Tambopata; (e) iii. M. brysonima, Brazil, Abuna; (f) i. M. diceras, lectotype; (f) ii. M. diceras, Brazil, Abuna; (f) iii. M. diceras, Peru, Manu. e.f.: ectal fold; pr.: prominent protuberance; s.d.: slight depression; t.: terminal fold.

FIGURE 9. Female S8–10, lateral view unless indicated otherwise. (a) M. amazonica, paralectotype; (b) i. M. bicornis, Surinam, Commetewane; (b) ii. M. bicornis, Brazil, Belem; (c) M. bovilla, Costa Rica, Puerto Viejo; (d) M. brevicauda, paratype, Peru, Tingo María; (e) i. M. brysonima, paratype of M. incisula, Venezuela, Marawaka; (e) ii. M. brysonima, holotype of M. weibezahni; (e) iii. M. brysonima, holotype of M. tetragena; (f) i. M. diceras, paralectotype; (f) ii. M. diceras, Brazil, Abuna; (f) iii. M. diceras, Guyana, Kamana; (f) iv. M. diceras, Venezuela; (f) v. M. diceras, Trinidad, N of Sangre Grande; (g) i. M. falcifera, paratype, Peru, Explorer’s Inn, ventral view on right.

FIGURE 10. Male S10, dorsal view. (a) M. amazonica, lectotype; (b) i. M. bicornis, Brazil, Paraupebas; (b) ii. M. bicornis, Surinam, Kabalebo; (b) iii. M. bicornis, Guyana, Kumu River; (b) iv. M. bicornis, French Guiana, N of Cayenne; (b) v. M. bicornis, Trinidad, E of Valencia; (c) M. bovilla, Costa Rica, La Selva; (d) i. M. brevicauda, holotype; (e) M. brysonima, Venezuela, Río Baria; (f) i. M. diceras, Brazil, Paraupebas; (f) ii. M. diceras, Brazil, Abuna; (f) iii. M. diceras, Peru, Pakitza; (f) iv. M. diceras, Peru, Pakitza; (f) v. M. diceras, Trinidad, Cumuto, paratype of M. manicaria; (f) vi. M. diceras, Trinidad, Cumuto, paratype of M. manicaria; (g) M. falcifera, holotype; (h) i. M. foreli, Colombia, Fundación; (h) ii. M. foreli, paratype M. westfalli, Panama, Barro Colorado # 54; (i) i. M. furcifera, holotype; (i) ii. M. furcifera, paratype, Peru, Río Seco. b.t.: bicuspidate tooth; r.: ridge.

FIGURE 11. Male S10, medio-dorsal view. (a) M. amazonica, lectotype; (b) i. M. bicornis, Surinam, Kabalebo; (b) ii. M. bicornis, Guyana, Potaro; (b) iii. M. bicornis, French Guiana, N of Cayenne; (b) iv. M. bicornis, Trinidad, E of Valencia; (c) M. bovilla, Costa Rica, La Selva; (d) M. brevicauda, holotype; (e) i. M. brysonima, Venezuela, Río Baria; (e) ii. M. brysonima, Peru, Tambopata; (e) iii. M. brysonima, Brazil, Abuna; (f) i. M. diceras, Brazil, Abuna; (f) ii. M. diceras, Trinidad, Cumuto, paratype of M. manicaria; (f) iii. M. diceras, Trinidad, E of Valencia; (g) M. falcifera, holotype; (h) M. foreli, Colombia, Fundación; (i) i. M. furcifera, paratype, Peru, Río Seco; (i) ii. M. furcifera, paratype, Peru, Río Seco; (j) M. gabrielae, holotype; (k) M. gibbosa, Ecuador, Copales; (l) M. guillermoi, holotype. b.t.: bicuspidate tooth; p-m.p.: postero-medial projection; pr.: prominence; r.: ridge; s.t.: single tooth; te.: teeth.

FIGURE 12. Male S10, lateral view. (a) M. amazonica, lectotype; (b) i. M. bicornis, Surinam, Kabalebo; (b) ii. M. bicornis, French Guiana, N of Cayenne; (c) M. bovilla, Costa Rica, La Selva; (d) M. brevicauda, holotype; (e) i M. brysonima, paratype of M. incisula, Venezuela, Marawaka; (e) ii M. brysonima, Venezuela, Río Baria; (f) i. M. diceras, Brazil, Paraupebas; (f) ii. M. diceras, Brazil, Abuna; (f) iii. M. diceras, Peru, Pakitza; (f) iv. M. diceras, Trinidad, Cumuto, paratype of M. manicaria; (g) M. falcifera, holotype; (h) i. M. foreli, Colombia, Fundación; (h) ii. M. foreli, paratype M. westfalli, Panama, Barro Colorado # 54; (i) i. M. furcifera, holotype; (i) ii. M. furcifera, paratype, Peru, Río Seco; (j) M. gabrielae, holotype; (k) M. gibbosa, paratype [FSCA], Ecuador, Copales; (l) M. guillermoi, holotype. sw.: swelling.