Stauropoctonus rectus Lima & Kumagai

Lima, Alessandro Rodrigues, Jacobi, Claudia Maria & Kumagai, Alice Fumi, 2013, Review of the Neotropical species of Stauropoctonus Brauns, 1889 (Hymenoptera: Ichneumonidae: Ophioninae), Zootaxa 3750 (5), pp. 494-514 : 508-512

Stauropoctonus rectus Lima & Kumagai sp. n.

( Figs 2 , 8 A–F, 10A–D)

Type locality. Brazil, Amazonas, Manaus (ZF-2). Geographic coordinates 2°35'21"S / 60°06'55"W.

Diagnosis. Body yellow; scape and pedicel brown, flagellum black; wings hyaline; pterostigma and fore wing vein Rs+2r black. Gena in lateral view triangular ( Fig. 8 C). Epicnemial carina absent on mesopleura. Weakly inflated scutellum, in lateral view evenly rounded. Fore wing with vein Rs+2r straight ( Fig. 8 D–E); glabrous area of discosubmarginal cell projecting towards 1m-cu bulla ( Fig. 8 E); marginal cell with a conspicuous pilose proximal region ( Fig. 8 E); vein cu-a reaching M+Cu opposite of Rs&M ( Fig. 8 D–E); vein 3rs-m longer than M (between 2m-cu and 3rs-m) ( Fig. 8 D–E).

Description (Holotype). Female. Mandible slender, apically strongly compressed and twisted about 90°; outer tooth acute, as long as inner one; outer mandibular surface with a shallow concavity crossing mandible at basal boundary of compressed area. Labrum 0.2x as long as wide basally. Malar space 0.28x as long as basal mandibular width. Clypeus weakly convex in lateral view, with margin clearly convex; about 1.7x as broad as long. Face alutaceous with setae sparcer centrally. Gena in lateral view triangular ( Fig. 8 C). Lateral ocellus contiguous with eye. FI = 59%. ECI = 0.99. Occipital carina absent. Antenna long and slender with 60 flagellomeres; twentieth flagellomere 1.9x as long as broad.

Mesoscutum polished, densely pilose, evenly rounded in lateral view; without notaulus. Mesopleuron polished, pilose; alutaceous below and smooth above mesopleural furrow, with a conspicuous glabrous region anterior to speculum. Epicnemial carina interrupted centrally on sternum; absent on pleuron. Scutellum smooth and shiny; as long as anterior width; weakly inflated; without lateral carina; in lateral view evenly rounded. Metapleuron weakly convex, alutaceous. Submetapleural carina weakly broadened anteriorly. Posterior transverse carina of mesosternum reduced to lateral vestiges. Propodeum densely pilose, abruptly declivous in lateral view; anterior transverse carina complete, not touching lateral longitudinal carina; posterior transverse carina complete; median longitudinal carina complete; lateromedian longitudinal carina absent; anterior area longitudinally rugose; posterior area weakly rugulose; lateral longitudinal carina complete.

Fore wing length 14.75 mm; AI = 0.88; CI = 0.37; ICI = 1.62; SDI = 0.93; SRI = 0.40; vein cu-a reaching M+Cu opposite of Rs&M ( Fig. 8 D–E). Discosubmarginal cell ( Fig. 8 E) with a glabrous area anteriorly, from pterostigma to apical third of Rs+2r and diagonally projecting towards 1m-cu bulla; Rs+2r slightly thickened basally, virtually straight; 1m-cu evenly curved, without ramellus. Marginal cell with a conspicuous pilose basal region ( Fig. 8 E). Hind wing R1 with four hamuli; Rs with basal half of first abscissa weakly bowed, distal half and second abscissa clearly straight; BCI = 0.50; basal abscissa of Cu1 1.25x as long as cu-a.

Mid leg with equal sized tibial spurs. On hind leg, coxa in lateral view 2x as long as maximum wide, at middle; fourth tarsomere 3x as long as broad apically; claws long, bearing close parallel sided pectinae.

Metasoma long and slender. Tergite 2 in lateral view 3.5x as long as posterior width; laterotergite pendant; thyridium oval, separated from anterior margin by 5.8x its length. Ovipositor straight and slender ( Fig. 8 F); subapical notch with two steps-like sculpture on its apical rim inner surface; with 4 teeth on lower valve apex.

Head yellowish. Scape and pedicel brown, flagellum black. Trunk, legs and metasoma basally brown. Mesoscutum with three light brown longitudinal fasciae. Apical half of tergite 3 and posterior tergites infuscate. Wings hyaline, pterostigma and fore wing vein Rs+2r black.

Males. Similar to females. Genitalia with gonostipes fused dorso-basally ( Fig. 10 C); gonocardo fused to gonostipes with ventral apophysis; gonostipes with deep dorsal longitudinal sulcus ( Fig. 10 B–C); apical indentation of gonostipes lozenge; gonostipital arm acuminate; gonolacinia with short spines concentrated in a single region; distivolsella spatulate. Aedeagus stem ( Fig. 10 D) is equally thickened along its length; in lateral view, the dorsal surface is straight, while the ventral one is weakly curved. Aedeagus apical process forms a right angle with the stem dorsal line in lateral view; ventral apical edge is curved, while basal edge is strongly angular.

Variation. Ranges for some features varying among the observed specimens are: FI = 54–62.5%; ECI = 0.95– 1.0; number of flagellomeres = 59–63; fore wing length = 13.5–15.5mm; AI = 0.71–0.94; CI = 0.29–0.50; ICI = 1.42–1.83; SDI = 0.89–1.0; SRI = 0.36–0.41; BCI = 0.46–0.54; number of hamuli on hind wing R1 vein = 4–6; basal abscissa of Cu1 1.25–2.5 times as long as cu-a. The pectinae in males’ tarsal claws are shorter than in females.

Comments. A straight Rs+2r vein in the genus is exclusive to S. rectus sp. n.. Since the genus description, the curved Rs+2r vein has been used as a diagnostic character, and it was also recovered as a synapomorphic feature (Gauld, 1985).

Etymology. From the Latin rectus (in a straight line) after its exclusive straight Rs+2r fore wing vein.

Distribution. Stauropoctonus rectus sp. n. is described from Northern Brazil: Amazonas state; in the municipalities of Manaus and Presidente Figueiredo.

Material examined. Holotype (♀). BRASIL, AM, Manaus, ZF-2, km-14, torre, 2°35'21"S / 60°06'55"W, 09– 12.xi.2004. Lençol: luz mista e BLB, 35 mts altura. C.S.Motta, A.S.Filho, S.Trovisco & L.S.Aquino leg. [INPA].

Holotype condition In good condition.

Paratypes (5 ♂) BRASIL, Amazonas, Presidente Figueiredo, AM 240, km 24, 2°01'05"S / 59°49'59"W, 04– 08.ix.2008, Lençol com luz mista. F.F.Xavier F°, T.K.Krolow & G.Lourido. [1 ♂, INPA]. Manaus, ZF-2, km-14, torre, 2°35'21"S / 60°06'55"W: 21–24.i.2004. Luz mista lençol +BLB+BL, 40m. Motta, CS, Trovisco, SF, Xavier FFF, Filho, AS. col. [1 ♂, INPA]; idem, 15–18.vi.2004. Lençol: luz mista e BLB, 40mts altura. J.A.Rafael, C.S.Motta, F.Godoi, S.Trovisco & A.Silva F° [1 ♂, INPA]; idem, 13–16.ix.2004. Lençol: luz mista e BLB, 35 mts altura. F.F.Xavier F°, A.R.Ururahy, F.Godoi & S.Trovisco [1 ♂, INPA]; idem, 10–13.xii.2004. Lençol: luz mista e BLB, 35 mts altura. C.S.Motta, A.S.Filho, S.Trovisco & M.Cutrin leg [1 ♂, INPA].

Figures

FIGURE 2. Species records of Stauropoctonus in the Neotropical Region.

FIGURE 8. Stauropoctonus rectus sp. n. (A – B, D – F: Holotype; C: Paratype) A. Female body, lateral view. B – C. Head. B, frontal view; C, lateral view. D. Wings, dorsal view. E. Discosubmarginal cell in detail, dorsal view. F. Female metasomal apex, lateral view. Scale in millimeters.

FIGURE 10. Male genitalia. Stauropoctonus rectus sp. n. (A – D): A, ventral view; B, lateral view; C, dorsal view; D, aedeagus, lateral view. Stauropoctonus leotacilioi sp. n. (E – H): E, ventral view; F, lateral view; G, dorsal view; H, aedeagus, lateral view. Stauropoctonus amazonensis sp. n. (I – L): I, ventral view; J, lateral view; K, dorsal view; L, aedeagus, lateral view. Scale bar = 0.5 mm.