Idris hyllus Debnath, Rajmohana & Sushama, 2025

Sushama, V., Debnath, Rupam, Rajmohana, K. & Dinesh, K. P., 2025, Description of four new species of Idris Förster, 1856 (Hymenoptera: Scelionidae) from India, European Journal of Taxonomy 997, pp. 256-274 : 264-267

Idris hyllus Debnath, Rajmohana & Sushama sp. nov.

urn:lsid:zoobank.org:act:66AF4D22-8F6C-49C0-AC38-3A1980EEDC8C

Fig. 3

Diagnosis

In the key to species of Idris known from India ( Rajmohana 2014), I. hyllus Debnath, Rajmohana & Sushama sp. nov, comes close to I. hunnaheus ( Mani, 1973) , but can be separated from the latter by the shorter T3 (1.6× of T2 length vs 2.2× of T2 length), shorter scape (3.3× longer than wide vs 4.2× longer than wide), shorter pedicel (1.3× longer than wide vs 2.1× longer than wide) and by the presence of longitudinal parallel costae extending to the 3/4 th of T2 medially (in I. hunnahaeus , T2 entirely longitudinally costate). In the species identification key of Lê (2000), this species runs to I. nautalis Kozlov & Lê, 1987 ; however, I. hyllus can be distinguished from the latter by shorter metasoma (1.4× as long as wide vs 2.0× as long as wide), T2 with longitudinal costate up to half of its length medially (in I. nautalis , T2 entirely longitudinally costate) and the absence of longitudinal striae on T3 (in I. nautalis , present). While much similar to I. fasciatipennis ( Girault, 1917) , Idris hyllus differs from the former by the longer A1 (4.8× in I. hyllus vs 3.4× in I. fasciatipennis ) and shorter clava (1.8× as long as wide in I. hyllus vs 2.5× as long as wide I. fasciatipennis ).

Etymology

The specific epithet is after its host, Hyllus semicupreus (Simon, 1885) and is intended as a noun in apposition.

Type material

Holotype

INDIA • ♀; West Bengal: Darjeeling, Hansqua ; 26.63992° N, 88.310141° E; 150 m alt.; 14 Dec. 2022; Rupam Debnath leg.; ex eggs of Hyllus semicupreus (Simon, 1885); ZSI/34236/H3.

Paratypes

INDIA • 9 ♀♀; same data as for holotype; ZSI/34237/H3 to ZSI/34245/H3 .

Description

Female

BODY LENGTH. 0.85–0.90 mm (n = 10).

COLOUR. Head and mesosoma honey brown to yellow; antenna, metasoma, legs, mandibles pale yellow except for the reddish-brown mandible tip; wings hyaline except clouded behind the st; setae on body white.

HEAD. 1.6× as wide as high; 1.2× as high as long; HW/TSL= 1.1; IOS 0.5× HW; head including frons, vertex, gena evenly imbricate throughout, densely setose; central keel incomplete, extending hardly up to lower level of eye margin; lagrimal small, smooth; facial striae absent; malar striae absent; eyes densely pubescent; mandible tridentate, middle tooth smaller than upper and lower tooth; lateral ocelli contiguous with orbital margin; POL> LOL in ratio of 15:8; POL 7.5× of OD; hyper occipital carina absent; occipital carina complete; A1 4.7× as long as thick; A1 1.2× as long as clava; A2 2.7× of A 3 in length; A3 subequal in length and width; proportions of length to width of A1 to A6 (144:30), (41:28), (15:20), (10:20), (9:19), (9:23); clava 1.8× as long as wide.

MESOSOMA. Mesoscutum and mesoscutellum 0.8× and 0.6× as long as wide respectively, finely granulose and moderately setose; notauli absent; mesoscutal suprahumeral sulcus and mesoscutal humeral sulcus absent; scutoscutellar sulcus foveolate laterally in axillar area and smooth medially; posterior mesoscutellar sulcus foveolate; metascutellum smooth; metanotal trough foveolate; propodeum with irregular longitudinal striae; pronotal suprahumeral sulcus absent; epomial carina distinct; cervical pronotal area granulate; lateral pronotal area smooth; mesopleural pit present; mesopleural carina incomplete, restricted to anterior half; femoral depression smooth; prespecular sulcus foveolate; mesepimeral sulcus foveolate up to mesopleural pit and then present as a strong carina towards mesocoxa; episternal foveae present, one in number; dorsal and ventral metapleural area smooth; metapleural pit distinct, from which metapleural sulcus extends as a smooth furrow anteriorly towards posterior margin of mesopleuron and posteriorly towards posterior margin of metapleuron; metapleural sulcus foveolate anterodorsally; paracoxal sulcus present as a simple furrow.

WINGS. Macropterous; forewing (L:W = 67:23), m: pm: st = 4:5:9; hindwing (L:W = 56:6).

METASOMA. 1.4× as long as wide. T1 with longitudinal parallel costae throughout, two lateral setae on each side; T2 longitudinally costate up to almost ¾ of its length medially and decreasing in length laterally, rest smooth, very sparsely setose laterally and sublaterally; T3 longest and widest of all tergites, 3.0× as long as T2, with fine coriaceous sculpture and irregular longitudinal rugulae extending almost ¾ of T3 medially, setose laterally and sub laterally, smooth apically; T4 and T5 imbricate and sparsely setose; T6 and T7 not visible in dorsal view; proportions of width to length of T1 to T5 being (124:51), (204:110), (310:180), (312:50), (203:25); S1 longitudinally costate; S2 with a row of fovea basally, followed by longitudinal parallel costae throughout; S3–S6 reticulate, moderate to densely setose.

Male

Unknown.

Biology

Reared from the eggs of Hyllus semicupreus ( Salticidae : Araneae ) ( Rajmohana et al. 2025).

Distribution

West Bengal ( India).

Variation

Very little in the material examined, except for differences in female body length (see the description above).

Molecular characterization

The COI sequences (GenBank: PP081609, PP081610) of I. hyllus show a minimum genetic distance of 12.3% to an unidentified species of Idris from Costa Rica (BOLD: JCCCH685-16).

Figures

Fig. 3. Idris hyllus Debnath, Rajmohana & Sushama sp. nov., holotype, ♀ (ZSI/34236/H3). A. Lateral habitus. B. Dorsal habitus. C. Frontal view of head. D. Antenna.E. Lateral view of mesosoma. F. Dorsal view of mesosoma and propodeum. G. Dorsal view of metasoma. H. Ventral view of metasoma. Scale bars: A–B = 0.2 mm; C–D, F = 0.02 mm; E, G–H = 0.1 mm.