Description of a new species of the genus Bitomus Szepligeti (Hymenoptera: Braconidae) from India
Ahmad Samiuddin 1, Zubair Ahmad 2 & Mohammad Shamim 2
1 Department of Plant Protection, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh, Uttar Pradesh 202002, India
2 Entomology Section, Department of Zoology, Aligarh Muslim University, Aligarh, Uttar Pradesh 202002, India
Email: 1 email@example.com
The genus Bitomus Szepligeti was recently redescri-bed and revised by Fischer (1987, 1994) and briefly treated by Papp (1978, 1982) and Wharton (1997). Among the opiine genera, it is the only genus that has metasomal terga 2-3 or 2-4 usually concealing the remainder of terga to form a hard shell (carapace) like structure. The genus is essentially Old World, mostly tropical with 16 described species, the genus is represented by seven species from Oriental, six species from Palaearctic and three species from Ethiopian region, (Fischer 1987). Bitomus is represented by a single species Bitomus hemicoriaceus Fischer from India. In the present work one new species is described under this genus from India. The diagnostic characters of the species is provided.
The terminology for the various body parts and wing venation is that of Sharkey & Wharton (1997), while Eady (1968) has been followed for the description of surface sculpture.
The types of the new species are deposited in the Insect Collection, Department of Zoology, Aligarh Muslim University, Aligarh, India.
Bitomus indicus Samiuddin sp. nov.
Holotype: Male, 24.vi.2002, Etawah, Uttar Pradesh, India, coll. Mohammad Shamim, HYM/BR007.
Paratypes: 1 male, 1 female, 15.ix.1982, Aligarh, Uttar Pradesh, India, coll. Shujauddin, HYM/BR052-053; 1 female, 19.iv.2005, Baburpur-Auraiya, Uttar Pradesh, India, coll. Mohammad Shamim, HYM/BR054.
Distribution: Uttar Pradesh, India.
Etymology: The specific name refers to the country of origin of the species.
Body: length 2.0mm.
Head: Polished, pubescent, 2.2x wider than long (24.5:11); frons smooth, polished. Eyes large, in the same level rounded with temple, 2.1x longer than temple (7.5:3.5); temple strongly narrow, 0.5x as long as eye (3.5:7.5). Occiput slightly curved. Ocelli slightly protruded, AOL:POL: OOL: OD = 2:3:5.5:2, stemmaticum densely punctate, width, 0.16mm., elsewhere sparsely punctuate and pubescent. Face evenly convex, quadratic, 1.6x as wide as high (12.5:8), thickly and deeply punctate, pubescent, middle carina visible clearly on top extinct on bottom; eye margin curved. Clypeus slightly convex, polished; more sparsely punctate than the face; 1.3x as wide as high (7:5.5); separated from face by a weak semi-circular suture, anterior margin protrudes fold like in the middle. Anterior tentorial pit (ATP) small, inter-tentorial line 2.3x as tentorial-ocular line (7:3). Malar area almost as long as basal mandibular width (3:3.5), mandibles at the base not wide. Oral cavity not visible. Maxillary palpi 0.7x as long as head height (12.5:18.5). Antennae filiform, almost as long as body (78:79.5), 22-segmented (range 20-22 segments), F1 twice as long as wide (4:2), following flagellomeres (F2-F12) almost equally long Length (3.5), rest (F13-F19) slightly short length (3), F18 and penultimate (F19) 1.7x as long as wide (3:1.8), flagellomeres are clearly separated from each other.
Mesosoma: 1.2x as long as high (30.5:24.5), 1.3x as high as head (24.5:18.5) and 1.1x as wide as head (27.5:24.5) dorsally slightly convex. Mesonotum sparsely punctate, polished, pubescent, 0.8x as wide as long (22:25), equally rounded before the tegulae, densely setose on anterior declivity; notauli impressed anteriorly, finely crenulate, absent on disc; mid-pit oval; rest of the disc sparsely setose. Scutellar sulcus deep, strongly crenulate. Scutellum sparsely punctate, polished, 1.7x as wide as long (13.5:8). Post axillae, side field of metanotum crenulate. Propodeum reticulate on anterior half, finely rugose posteriorly with a short mid-longitudinal carina anteriorly. Side of pronotum overall crenulate, more prominent below. Mesopleuron smooth, polished, anterior marginal furrow finely crenulate below, posterior marginal furrow finely crenulate above clearly crenulate below; sternaulus deeply impressed, wide, strongly crenulate; extends from anterior to ventral margin. Metapleuron reticulate, epimerum crenulate. Legs short, broad, hind femur 3.5x as long as wide (17.5:5).
Wings: Stigma wide, wedge shaped length 0.55mm, width 0.15mm; r arising from basal third of stigma (22:7), 0.4x as long as width of stigma (2.5:6), a slight angle with 3RSa formed; 3RSa 1.3x as long as 2RS (12.25:9.5); 3RSb slightly outwardly curved, 1.9x longer than 3RSa (23:12.25). Marginal cell extends clearly upto wing apex; m-cu postfurcal; second submarginal cell slightly narrow apically almost rectangular. 1CU 1.5x as long as m-cu (9:6); 1 cu-a postfurcal; first sub-discal cell closed, 2CUb arising slightly below middle of first subdiscal cell; m-cu absent in hind wing.
Metasoma: Wide and roundish, 1.3x as long as wide (38:29.5), suture between T2 and T3 is not clearly visible; petiole strongly striated, 0.7x as long as its apical width (11.5:16.5), apex 2.3x wider than its base (16.5:7), side margin of apical third parallel, basal carina visible until apical margin widely separated from each other, merged in the striations, the space between basal carina clearly striated; more than 2/3 of the carapace granulate, extreme apex of carapace smooth and polished, the spiracles on carapace are considerably far from its margin; rest of the tergites concealed beneath carapace. Ovipositor short, length = 0.09mm, sheath with 8-8 setae arranged on either side.
Colour: Body black; legs yellow, palpi pale; antennae from F8 to apex, tegulae brown; F1-7, scape, pedical, mandible brown; mandibular tip and tarsal claw dark brown; wings infuscate, stigma and veins brown.
Male: Similar to the female.
The new species, Bitomus indicus Samiuddin, sp. nov., closely resembles Bitomus hemicoriaceus Fischer but differs in having clypeus 1.3x as wide as high (clypeus twice as wide as high in hemicoriaceus), mesonotum 0.8x as wide as long (mesonotum 1.5x as wide as long in hemicoriaceus), propodeum with a short mid-longitudinal carina anteriorly (propodeum with a curved cross carina in hemicoriaceus), vein r arising from basal third of stigma (vein r arising from middle of stigma in hemicoriaceus).
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Wharton, R.A. (1997). Generic relationships of Opiine Braconidae Hymenoptera) parasitic on fruit-infesting Tephritidae (Diptera). Contributions of the American Entomological Institute 30: 1-53.