Idris adikeshavus 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

Taxon classification Animalia Hymenoptera Platygastridae

Idris adikeshavus Veenakumari sp. n. Figures 1-7

Holotype

(Female). (ICAR/NBAIR/P371) INDIA: Sikkim, Gangtok, Hanuman Tok, SN, 15.x.2008. Paratypes: (ICAR/NBAIR/372), 1 female same data as holotype; (ICAR/NBAIR/P373), 1 female Sikkim, Gangtok, Ranipul, 04.vi.2008, SN; (ICAR/NBAIR/P374), 1 female Sikkim: Pakyong, MT, 02.11.2014; (ICAR/NBAIR/P375), 1 male Sikkim, Tadong, ICAR complex for North Eastern Hill Region, YPT, 29.x. 2014.

Type locality.

INDIA: Sikkim

Description of female.

Color and size (Figs 1, 3). Head and mesosoma blackish brown, metasoma brown, shining; T7 anteriorly yellow and posteriorly brownish yellow; legs including coxae brown; radicle light brown; A1 brownish black with extremities light brown; A2 dark brown with apex light brown; A3-A6 light brown; clava brownish black. Body length=1.194 mm.

Head (Figs 2, 5). FCI = 1.37; LCI = 1.7; IOS 0.56 × width of head; POL> LOL in ratio of 19.7:10.2; lateral ocelli contiguous with eye; compound eyes small (L:W = 14.7:12.7) densely setose; orbital carina sharp, well developed; temples not visible in lateral view; lower frons smooth and shining with strong facial striae; upper frons and vertex setigerous punctate; gena smooth; central keel 0.37 × head height; length and width of antennomeres A1-A7 in ratio of 15.1:3.3, 5.1:2.8, 2.0:2.1, 1.9:1.8, 1.8:20, 1.9:2.3, 17.2:7.7, respectively; radicle 0.27 × length of A1.

Mesosoma (Figs 2, 4). Mesoscutum (L:W = 18.5:27.6) setose, anteriorly reticulate, posteriorly punctate; notauli (L:W = 6.0:1.5) present; internotular distance 0.45 × width of mesoscutum; mesoscutellum (L:W = 7.6:22.7) sparsely setigerous punctate; scutoscutellar sulcus laterally foveate and medially non-foveate; metascutellum smooth, narrow medially, increasing in size laterally; metanotal trough foveate; lateral pronotal area smooth, foveate on posterior margin; mesopleuron with 8 transverse ridges beneath tegula; mesopleural carina, femoral depression and mesopleural pit distinct; metapleuron smooth, metapleural pit distinct; paracoxal sulcus foveate basally; propodeum present as two carinate lamellae anterior to horn.

Fore wing (Fig. 7) (L:W = 63.1:18.0) spatulate, apically stipulate; apical half of fore wing with extremely long marginal cilia, 1.7 × width of wing; five long, thick bristles present on submarginalis; entire wing covered with long thin microtrichia; length of submarginalis: marginalis: stigmalis in ratio of 28.2:3.5:10.4; hind wing (L:W = 62.7:10.7) deeply curved inwards beyond submarginal vein; long marginal cilia, 2.65 × width of wing present apically; marginal cilia on the incurved anterior margin of wing, 0.26 × width of wing, while those on posterior margin of wing 0.81 × width of wing; microtrichia on hind wing small and sparse.

Metasoma (Fig. 6). (L:W = 69.1:31.4); T1 finely costate with a long smooth horn; length of horn 1.28 × length of T1; posterior margin of T1 beyond horn smooth with a single costa in between; T2 costate, costae broad, tapering posteriorly, almost reaching posterior margin of T2; length of T2 equal to T3; T3 weakly costate antero-medially; costae reaching 0.63 × length of T3; rest of T3 smooth; T4-T7 smooth; T7 acuminate; long setae present on lateral margin of T2, sublateral and lateral margin T3-T6; ovipositor extruded 0.35 × length of T7; length and width of tergites T1-T7 in ratio of 11.2:18.1, 13.8:19.1, 13.8:30.9, 6.0:26.1, 3.2:20.1, 2.1:14.6, 19.2:10.6, respectively.

Variability (n=4). Female body length: 1.158-1.198 mm (m=1.176, SD=0.03); FCI=1.30-1.38 (m=1.34; SD=0.04); LCI=1.68-1.8 (m=1.69; SD=0.01); mesoscutum length=0.183-0.205 mm (m=0.188; SD=0.07); mesoscutum width=0.25-0.282 mm (m=0.269; SD=0.09); mesoscutellum length=0.074-0.080 mm (m=0.075; SD=0.08); mesoscutellum width=0.188-0.229 mm (m=0.206; SD=0.01); fore wing length=0.621-0.653 mm (m=0.643; SD=0.03); fore wing width=0.170-0.185 mm (m=0.183; SD=0.09); length of fore wing marginal cilia=0.396-0.426 mm (m=0.406; SD=0.08); hind wing length=0.62-0.638 mm (m=0.632; SD=0.03); hind wing width=0.084-0.11 mm (m=0.092; SD=0.04); length of hind wing marginal cilia=0.283-0.302 mm (m=0.286; SD=0.08); length of T1=0.104-0.112 mm (m=0.109; SD=0.07); length of T2=0.136-0.139 mm (m=0.137; SD=0.07); length of T3=0.134-0.138 mm (m=0.135; SD=0.03).

Description of male

(Figs 8, 9, 10). Body length = 1.14 mm. Similar to female except for the following character states.

Absence of horn on T1

Metascutellum broad and distinct when viewed dorsally

Male antenna twelve segmented, constriction between A11 and A12 distinct; length and width of antennomeres A1-A12 in ratio of 15.0:4.3, 5.5:3.5, 4.5:3.8, 3.5:3.3, 3.3:3.8, 3.5:3.8, 3.5:3.8, 4.3:3.8, 4.1:3.8, 4.1:4.3, 3.8:4.3, 8.0:4.3

Shape of wings different. Fore wing (L:W = 87.1:20.0) narrow, elongate and densely setose; hind wing (L:W = 79.1:10.3) less curved, densely setose; fore wing marginal cilia 1.34 × width of wing; hind wing marginal cilia 1.73 × width of wing; wings 1.39 × longer than in female

Etymology.

The species is named ' adikeshavus ' meaning first one to have long hairs in Sanskrit, alluding to the long marginal setae on both pairs of wings in this species as well as the species group.

Diagnosis.

Idris adikeshavus differs from Idris brevicornis , Idris deergakombus and Idris lopamudra by having T2 equal to T3 while in all others T2> 1.7 × length of T3; T3 faintly costate in Idris adikeshavus while T3 smooth in other three species; Idris adikeshavus differs from Idris brevicornis and Idris lopamudra in having longer and denser microtrichia on fore wings, while it is almost smooth in the latter two. In Idris adikeshavus , A4 and A5 subequal to A3 while in others A4 and A5 0.6 –0.7× length of A3. Idris teestai differs from Idris adikeshavus in having a fully reticulate mesoscutum and mesoscutellum.