Dentigaster brullei Braet & Sharkey

Sharkey, M. J. & Braet, Y., 2012, New species of the rare genera Dentigaster Zettel, 1990 (Hymenoptera, Braconidae, Cheloninae) and Minanga Cameron, 1906 (Sigalphinae) from French Guiana, Journal of Hymenoptera Research 25, pp. 93-102 : 94-97

Dentigaster brullei Braet & Sharkey sp. n.

Holotype.

Female.

Diagnosis.

This species is easily distinguished from Dentigaster barbarella Zettel, 1990 by its whitish basal flagellomeres (vs. yellowish-orange), the head and thorax fully blackish (vs. orange), and the carapace with several coarse, parallel apical carinae (vs. regularly rounded) in dorsal view. The new species is closer to Dentigaster walteri Zettel, 1990 or Dentigaster tenuiventris Zettel, 1990 and it can be distinguished from these by its size (6 mm vs. +/- 4mm), the shape of coarse rugae at the distal apex of the metasoma (with always the same width along their length vs. with some enlargements at their apex), and by the color of the basal flagellomeres (whitish vs. brownish).

Size.

Body length 6 mm, fore wing length 4.2 mm.

Color.

The first two flagellomeres whitish, the following dark brown. Scapus dorsally brown and ventrally light yellowish.Head fully dark brown; upper part of face and face at the inner margin of eyes lighter (whitish).Mesosoma fully dark brown.Fore wing with strongly infuscate bands; with a transverse white strip at level of parastigma, apex of fore wing and hind wing lightly infuscate. Stigma and veins brown. Fore and mid femur except basally and apically, hind coxa, hind femur, apical 2/3 of hind tibia dark-brown. Outer hind tibial spur, hind tarsomeres 3-5, mid tarsomeres 3-5, all light brown. All remaining parts of legs whitish. Carapace brown except white median patch basally (covering median part of T1 and basal part of T2), apical sternites brown. Ovipositor sheath yellowish.

Head.

Head 0.89 × as wide as its median length. Antennal socket inserted close to top of eyes in lateral view. Antenna with 37 flagellomeres. Scapus 1.72 times as long as maximally wide, longer than first flagellomere. First flagellomere 3 times as long as wide, longer than second one. Penultimate flagellomere as long as wide, 0.05 times as long as first flagellomere, shorter than apical segment. Flagellomeres gradually decreasing in size from base to apex. Last 10 apical flagellomeres without placodes on all sides. Placodes entirely missing on apical flagellomeres. Eye 1.4 times length of temple (in dorsal view), 1.48 times as high as broad, with short and sparse setae. Clypeus flat in lateral view, with more or less convex lower margin, with two small apical teeth medially, its surface smooth. Upper margin of clypeus with large punctures, dorsal surface of clypeus densely punctate. Malar suture absent. Malar space equal to basal width of mandible, 0.32 × eye height. Face strongly convex in lateral view, surface punctate (medially finely punctuate, laterally largely smooth and punctate) with short, sparse setae (long setae present on mandible). Temple not swollen in dorsal view, its surface coarsely rugulose/punctate, with short, sparse setae. Frons transversely striate, concave, with a weak carina between antennal sockets, without lateral carina. POL 1.67 × ocellar diameter, 3 × OOL. Vertex striate, with faint, weakly transversely rugulose punctures and short sparse setae. Occipital carina present, complete, joining hypostomal carina before mandible.

Mesosoma.

Pronotum striate/costate ventrally and dorsomedially, punctate dorsolaterally (large punctures becoming small and very dense at upper margin), dorsally without modifications. Pronotal furrow absent. Mesosoma 1.59 × as long as wide in lateral view, 1.51 × as long as wide in dorsal view. Mesoscutum sharply raised anteriorly, at right angle with pronotum, medioanteriorly dull (impunctate), median lobe without median groove anteriorly. Mesoscutum with sparse, short setae. Surface of mesoscutum medially, near scutellar sulcus, largely longitudinally punctate, surface rather smooth between punctures. Notauli entirely absent. Scutellar sulcus 4x as long as wide, 1.33 × as long as scutellum, its surface smooth. Scutellar sulcus with 7 complete carinae. Scutellum rounded laterally, flattened in lateral view, its surface smooth and punctate (large punctures widely spaced). Subalar groove punctate. Mesopleuron entirely areolate with sparse, short setae. Sternaulus absent. Ventral surface of mesopleuron more or less punctate (regularly spaced). Propodeum 0.33x as long as mesosoma (in dorsal view), its surface areolate to largely punctate, carinated areas completely absent but mediolongitudinal carina anteriorly present. Propodeum vertical posteriorly, with sparse, short setae. Propodeum with four pointed rounded angles, more developed laterally than medially (rather tuberculate laterally); median tubercles present and short (as high as wide). Lateral tubercles of propodeum 0.5 times their maximum transverse width, propodeal tubercles straight, with rounded apices. Surface of metapleuron largely punctate, with short, sparse setae. Metapleural flange absent. Wings: pterostigma 4.44 × as long as wide. Marginal cell of fore wing distally closed. Vein r 0.7 × as long as vein 3-SR, 0.16 × as long as vein SR1, 0.25 × as long as vein 2-SR. Vein 2-SR of fore wing present. Vein 1-SR+M present, straight. First discal cell of fore wing 2.93 × as long as wide (measured perpendicularly to vein 1-CU1+2-CU1). Vein r-m of fore wing present with a wide bulla. Vein m-cu postfurcal. Vein cu-a of fore wing present, postfurcal. Vein CU1a (relative to cubital vein (2-CU1) of fore wing) arising behind middle of distal vein of subdiscal cell. Vein CU1b postfurcal with m-cu. First subdiscal cell of fore wing distally closed (vein 2cu-a present). Vein 2-1A long. Hind wing vein 1-SC+R present. Subbasal cell of hind wing medium sized. Hind wing vein M+CU 0.8 times as long as vein 1-M. Hind wing vein r absent, m-cu absent. Basal cell of hind wing closed, vein cu-a present. Legs: Femur not swollen. Hind coxa large, dorsally and ventrally smooth. Hind femur 3 × as long as wide. Hind femur with sparse setae, its surface dorsally and ventrally smooth and finely punctate. Hind tibia 6.67 × as long as wide, 2.16 × as long as the hind basitarsomere length, with dense, stout and rather short setae, apically without any special patch of setae on its inner side. Hind basitarsomere 7.40 × as long as maximally wide, 0.9 × as long as tarsomeres 2-5.

Metasoma.

Metasoma with two sutures on carapace. Carapace fully longitudinally rugose-striate, striae protruding apically. Carapace apically emarginate. First tergite 0.73 × as long as apical width, without basolateral process near base. Two median carinae present, less than or equal to a third of petiole length, median carinae widely spaced and strong. First tergite longitudinally striate over entire surface. First and second tergites fused. Surface of second tergite longitudinally striate-rugulose. Median length of second tergite 0.92 × times its basal width, 1.27 × as long as first tergite. Second metasomal suture straight. Third tergite longitudinally striate and rugose. Fourth to sixth tergites concealed by metasomal carapace. Carapace 2.22 × as long as wide in dorsal view; ventral foramen of carapace as long as carapace, fine lamella running laterally on carapace and ending as acute curved tooth apically. Genitalia and ovipositor: ovipositor sheath 0.3 × as long as metasoma. Ovipositor sheath with normal, short and thin setae.

Male.

Unknown

Etymology.

From the name of G.A. Brullé, a French entomologist of the XIX century who described several Neotropical Braconidae , and from the name of my friend Stéphane Brullé, who collected this new species.

Material Examined.

Holotype ♀, "Guyane française, RN Nouragues (Saut Pararé), 16.IX.2010, Rec. SEAG 2010", N4 02.368-W52 40.429. [IRSNB]

Distribution.

Neotropical (French Guiana).

Identification key to Dentigaster Zettel, 1990 (modified after Zettel, 1992)