Stauropoctonus michelle 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 : 505-508

Stauropoctonus michelle Lima & Kumagai sp. n.

( Figs 2 , 7 A–F, 9I –L)

Type locality. Brazil, Minas Gerais, Marliéria (Parque Estadual do Rio Doce).

Diagnosis. Body yellow; scape and pedicel brown, flagellum black; speculum brown; wings hyaline, pterostigma and fore wing vein Rs+2r brown. Gena in lateral view triangular ( Fig. 7 C). Epicnemial carina absent on mesopleura. Weakly inflated scutellum, in lateral view evenly rounded. Fore wing marginal cell with a conspicuous glabrous proximal region ( Fig. 7 E); vein cu-a reaching M+Cu basad of Rs&M ( Fig. 7 D).

Description (Holotype). Female. Mandible slender, apically strongly compressed and twisted about 90°; outer tooth acute, 0.9x 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 0.2x as long as basal mandibular width. Clypeus weakly convex in lateral view, with margin truncate, about 1.6x as broad as long. Face alutaceous with setae sparcer centrally. Gena in lateral view triangular ( Fig. 7 C). Lateral ocellus contiguous with eye. FI = 49%. ECI = 0.89. Occipital carina absent. Antenna with 66 flagellomeres; twentieth flagellomere 1.6x 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 present, interrupted at middle, not touching median longitudinal carina, which is complete; lateromedian longitudinal carina represented by vestiges at apex of propodeum; anterior area longitudinally rugose; posterior area weakly rugulose; lateral longitudinal carina complete.

Fore wing length 16.35 mm; AI = 0.65; CI = 0.27; ICI = 1.31; SDI = 0.94; SRI = 0.44; vein cu-a reaching M+Cu basad of Rs&M ( Fig. 7 D). Discosubmarginal cell ( Fig. 7 E) with a glabrous area anteriorly, from pterostigma to the basal third of the length of vein Rs+2r which is abruptly curved and thickened on its basal fifth; 1m-cu abruptly curved at middle, straight at basal half, weakly convex at apical half, without ramellus. Marginal cell ( Fig. 7 E) with a conspicuous glabrous area basally, reaching about a third of Rs+2r length. Left hind wing R1 with five hamuli, right one with six hamuli; Rs with basal half of first abscissa weakly bowed, distal half and second abscissa clearly straight; BCI = 0.59; basal abscissa of Cu1 1.5x as long as cu-a.

Mid leg with outer tibial spur 1.1x as long as inner one. On hind leg, coxa in lateral view 2x as long as maximum wide, at middle; fourth tarsomere 3.2x as long as broad apically; claws long, with pectinae with uniform height towards apex.

Metasoma long and slender. Tergite 2 in lateral view 3.2x as long as posterior width; laterotergite pendant; thyridium oval, separated from anterior margin by 5x its length. Ovipositor straight and slender ( Fig. 7 F); subapical notch with two steps-like sculpture on its apical rim inner surface; with 4 teeth on lower valve apex.

Head and alitrunk yellowish. Scape and pedicel brown, flagellum black. Propodeum, mesosternum, prepectum and legs yellowish brown. Mesoscutum with three brown longitudinal fasciae. Speculum brown. Metasomal anterior segments yellowish brown; apical half of tergite 3 and posterior tergites infuscate. Wings hyaline, pterostigma and fore wing vein Rs+2r brown.

Males. Similar to females. Genitalia with gonostipes fused dorso-basally ( Fig. 9 K); gonocardo fused to gonostipes with ventral apophysis ( Fig. 9 I–K); gonostipes with shallow dorsal longitudinal sulcus, without sculpture ( Fig. 9 J); apical indentation of gonostipes ellipsoid ( Fig. 9 I); gonostipital arm acuminate; gonolacinia with short spines concentrated in a single region; distivolsella spatulate. Aedeagus stem ( Fig. 9 H) is gradually thickened to apex; in lateral view, dorsal surface is concave, while ventral one is convex. Aedeagus apical process forms an acute angle with the stem dorsal line in lateral view; ventrally, both basal and apical edges are curved, and the last one is also slightly projected.

Variation. Ranges for some features varying among the observed specimens are: FI = 49–62%; ECI = 0.88– 1.0; number of flagellomeres = 62–68; fore wing length = 13.7–16.5 mm; AI = 0.65–0.89; CI = 0.26–0.36; ICI = 1.12–1.83; SDI = 0.94–1.06; SRI = 0.36–0.44; BCI = 0.53–0.66; number of hamuli on hind wing R1 vein = 4–6; basal abscissa of hind wing Cu1 vein 1.25–2.5x as long as cu-a.

The two female specimens from Amazonas and one from Minas Gerais have the fore wing vein cu-a reaching M+Cu opposite of Rs&M.

Comments. In a few specimens there is a faint sulcus separating prepectus and mesopleuron, caused by differences in the sculpture between one and another area. Depending on the lighting and optical device used, it may be easily confused with the epicnemial carina, causing errors in interpretation of the character and consequently in the species identification.

Etymology. This species is named after Michelle Villefort de Bessa Campos, the first author’s wife.

Distribution. Stauropoctonus michelle sp. n. is described from Brazil: Amazonas and Minas Gerais states.

Material examined. Holotype (♀). Brasil, Minas Gerais: Marliéria (P. Est. Rio Doce), 12–18.viii.1978, M.A.V. D'Andretta col. [UFMG].

Holotype condition. Last right hind tarsomere is glued in a in a triangle label attached to the type pin. Apart from that it is in good condition.

Paratypes (9 ♀, 2 ♂) Brasil, Amazonas: Manaus, ZF-2, km-14, torre, 2°35'21"S / 60°06'55"W, 13–16.viii.2004. Lençol: luz mista e BLB, 35 mts altura. J.A.Rafael, F.F.Xavier F°, A.R.Ururahy, A.S.Filho & S.Trovisco [1 ♀, INPA]. Coari, rio Urucu, lg. Marta-3, 4°50'73"S / 65°02'37"W, 14–25.viii.1993, P.F.Bührnheim et al. col. À luz mista de mercúrio [1 ♀, UFAM]. Minas Gerais: Marliéria (P. Est. Rio Doce) 12–18.viii.1978. M.A.V.D'Andretta col. [1 ♀, UFMG]; idem, 07–15.x.1978 [1 ♀, 1 ♂, UFMG]; idem, 15–20.ix.1979 [2 ♀, UFMG]; idem, 19– 25.x.1979 [3 ♀, UFMG]; idem, 20–26.x.1980 [1 ♂, UFMG].

Figures

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

FIGURE 7. Stauropoctonus michelle sp. n. (A – B, D: Holotype; C, E – F: Paratypes) 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 9. Male genitalia of Stauropoctonus sp. (A – D): A, ventral view; B, lateral view; C, dorsal view; D, Aedeagus, lateral view. S. excarinatus genitalia (E – H): E, ventral view; F, lateral view; G, dorsal view; H, Aedeagus, lateral view. Stauropoctonus michelle sp. n. genitalia (I – L): I, ventral view; J, lateral view; K, dorsal view; L, Aedeagus, lateral view. Gonostipes (Gst.); gonocardo (Gc.); ventral apophysis (Va.); dorsal longitudinal sulcus (Dls.); gonostipital apical indentation (Gai.); gonostipital arm (Gst. A.); gonolacinia (Gl.); distivolsella (Dv.); apical process of aedeagus (Ap.); Aedeagus stem (As.). Scale bar = 0.5 mm.