Idris brevicornis Veenakumari

Kamalanathan, Veenakumari, Mohanraj, Prashanth & Khan, F. R., 2015, ' The adikeshavus-group': A new species group of Idris Foerster (Hymenoptera, Platygastridae) from India, with descriptions of five new species, Deutsche Entomologische Zeitschrift 62 (2), pp. 247-260 : 249-250

Taxon classification Animalia Hymenoptera Platygastridae

Idris brevicornis Veenakumari sp. n. Figures 11-17

Holotype

(Female). (ICAR/NBAIR/P381) INDIA: Karnataka: Bengaluru, Attur, PFT, 24.xii.2012. Paratypes: (ICAR/NBAIR/P382), 1 male, same data as holotype, YPT, 08.viii.2013; (ICAR/NBAIR/P383), 1 female, Karnataka: Chikkaballapur, Nandi Hills, SN, 16.xi.2009; (ICAR/NBAIR/P384, P385, P386), 3 females, Karnataka: Bengaluru, Jarakabande Kaval, MT, 22.xi.2013; (ICAR/NBAIR/P387), 1 female, same data as P386, 31.xii.2013; (ICAR/NBAIR/P388), 1 female, same data as P386, 18.x.2013; (ICAR/NBAIR/P389), 1 female, same data as P386, 09.xii.2013; (ICAR/NBAIR/P390), 1 male, Tamil Nadu: Hosur, Uddanapalli, YPT, 31.i.2015; (ICAR/NBAIR/P408, P409), 2 females, Karnataka: Bengaluru, Gandhi Krishi Vigyana Kendra, YPT, 22.xii.2014; (ICAR/NBAIR/P410), 1 female, same data as P390; (ICAR/NBAIR/P411), 1 female, same data as P384, 30.xii.2014.

Type locality.

INDIA: Karnataka, Tamil Nadu

Description of female.

Color and size (Figs 11, 12). Entire body dark brownish black except yellow T7; legs brown. Body length = 0.716 mm.

Head (Figs 13, 14, 16). FCI=1.37; LCI=1.70; IOS 0.62 × width of head; POL> LOL in ratio of 16.5:10.4; length and width of compound eye in ratio of 11.1:8.0; lower frons smooth with facial striae; upper frons and vertex with setigerous punctae; length and width of antennomeres A1-A7 in ratio of 11.6:2.8, 4.5:2.5, 1.8:1.5, 1.3:1.5, 1.3:1.5, 1.8:2.0, 11.5:6.5 respectively; radicle 0.26 × length of A1.

Mesosoma (Fig. 14). Mesoscutum (L:W = 14.3:22.5) anteriorly weakly reticulate, rest smooth, sparsely setose; mesoscutellum (L:W = 5.6:16.9) smooth, sparsely covered with setigerous punctae; notauli short (L:W = 3.9:0.8); internal notular distance 0.54 × width of mesoscutum; lateral pronotal area smooth with few foveae ventrally; mesopleuron with six transverse carinae beneath tegula and two short transverse carinae beneath these elongate carinae; femoral depression distinct with foveae posteriorly; mesepimeral sulcus distinct; metapleuron smooth with few foveae ventrally; metapleural pit distinct; scutoscutellar sulcus not foveate except for a single fovea laterally; metascutellum narrow, rectangular; metanotal trough anteriorly smooth and posteriorly with longitudinal foveae; propodeum medially produced as a rectangular costate plate; lateral propodeal area weakly costate.

Fore wing (Fig. 15) (L:W = 34.9:12.7) totally devoid of microtrichia in apical half; a few short microtrichia found basally; hind wing (L:W = 34.3:7.9) with a few short microtrichia; fore wing marginal cilia 2 × width of wing while hind wing marginal cilia 2.14 × width of wing; submarginalis: marginalis: stigmalis in ratio of 16.1:3.1:5.3.

Metasoma (Fig. 17). (L:W = 41.3:25.1); T1 finely costate, with a short round medial horn; horn with a few weak transverse costae laterally and almost smooth posteriorly; height of horn 0.39 × length of T1; T2 with basal foveae; T2 costate, costae not reaching posterior margin; rest of tergites smooth; T2, 1.95 × longer than T3; sparse long setae found laterally and sublaterally on T2-T4; length and width of tergites T1-T7 in ratio of 7.7:17.5, 13.7:19.4, 7.0:23.8, 2.6:19.5, 1.5:14.2, 1.5:11.8, 6.7:8.3, respectively; ovipositor 0.65 × length of T1.

Variability (n=12). Female body length: 0.677-0.782 mm (m=0.72; SD=0.04). FCI=1.31-1.41 (m=1.38; SD=0.02); LCI=1.65-1.71 (m=1.68; SD=0.01); mesoscutum length=0.122-0.149 mm (m=0.138; SD=0.07); mesoscutum width=0.213-0.239 mm (m=0.227; SD=0.01); mesoscutellum length=0.046-0.065 mm (m=0.054; SD=0.06); mesoscutellum width=0.16-0.192 (m=0.183; SD=0.01); fore wing length=0.297-0.398 mm (m=0.352; SD=0.03); fore wing width=0.113-0.135 mm (m=0.12; SD=0.01); length of fore wing marginal cilia=0.212-0.239 mm (m=0.221; SD=0.01); hind wing length=0.288-0.346 mm (m=0.331; SD=0.03); hind wing width=0.075-0.089 mm (m=0.08; SD=0.04); length of hind wing marginal cilia=0.148-0.189 mm (m=0.172; SD=0.01); length of T1=0.071-0.079 mm (m=0.076; SD=0.04); length of T2=0.123-0.139 mm (m=0.131; SD=0.06); length of T3=0.051-0.071 mm (m=0.062; SD=0.08).

Description of male

(Figs 18, 19, 20). Similar to female; Body length=0.758 mm; length and width of antenno meres A1-A12 in ratio of 11.8:3.3, 5.3:3.3, 3.5:3.3, 2.3:2.8, 2.5:3.3, 2.3:2.8, 2.8:3.0, 3.0:3.3, 3.0:3.5, 3.0:3.5, 3.5:3.5, 5.8:3.5 respectively; fore wing (L:W = 60.7:14.2) and hind wing (L:W = 52.7:7.3) densely covered with long microtrichia; fore wing marginal cilia equal to width of wing; hind wing marginal cilia 1.81 × width of wing.

Etymology.

The species is named ' brevicornis ' referring to the short horn on T1.

Diagnosis.

Idris brevicornis differs from Idris lopamudra in having a short horn, with the latter having a longer horn which is distinctly costate laterally and posteriorly; T2 in Idris brevicornis is 1.95 × longer than T3 while in Idris lopamudra T2 1.7 × longer than T3; propodeum is extended as median costate plate in Idris brevicornis which is not so in other species of Idris described here.