Idris furvus Sushama, Rajmohana & Debnath, 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 : 261-264

Idris furvus Sushama, Rajmohana & Debnath sp. nov urn:lsid:zoobank.org:act:806816B7-BE04-44CD-A3E6-0EEF6B7707CD

Fig. 2

Diagnosis

Following Rajmohana (2014), I. furvus Sushama, Rajmohana & Debnath sp. nov. comes close to I. dubarensis Mukerjee, 1981 but can be separated from the latter by sculpture of head (imbricate vs coriaceous), body colour (black vs brownish yellow), smaller T3 (<2.0× T2 length vs> 2.5× of T2 length) and absence of a transverse darker band in the forewing (in I. dubarensis , present). Based on the body colour, sculpture of head and other morphological characters, this species resembles I. hirsutus Sunita & Rajmohana, 2024 . However, I. furvus can be distinguished from I. hirsutus by its complete mesopleural carina (in I. hirsutus , restricted to anterior half), wider head (2.3× as wide as long vs 1.8× as wide as long) and shorter T3 (1.9× of T2 length vs 2.5× of T2 length). In the species identification key of Lê (2000), this species runs to I. denkis Kozlov & Lê, 1987 ; however, I. furvus can be distinguished from the latter by metasomal sculpture. In I. furvus , T2 is with longitudinal costae up to ¾ of its length (in I. denkis , T2 with only a row of basal fovea), T3 finely striated medially and reticulate laterally (in I. denkis , T3 entirely finely reticulate) and lacks facial striae (in I. denkis , present). While much similar to I. luteipes ( Crawford, 1910) from the Oriental region, I. furvus can be distinguished mainly by pleural sculpture. In I. furvus , the episternal foveae are absent (present in I. luteipes ), the posterodorsal metaplural sulcus present as a simple furrow (foveolate in I. luteipes ) and the paracoxal sulcus is smooth (foveolate in I. luteipes ).

Etymology

The specific epithet is after the Latin word ‘ furvus ’ = ‘black’, due to the black body colour. It is intended as an adjective in apposition.

Type material

Holotype

INDIA • ♀; West Bengal: South 24 Parganas, Raidighi ; 21.9965° N, 88.4365° E; 26 m alt.; 28 Nov. 2022; V. Sushama leg.; ZSI/34234/H3.

Paratype

INDIA • 1 ♀; same data as for holotype; ZSI/34235/H3 .

Description

Female (holotype)

BODY LENGTH. 1.23 mm.

COLOUR. Head, mesosoma black; legs and antennae honey brown except dark brown tip of clava; metasoma brownish black except for reddish brown T1 and basal portion of T2; mandibles, posterior scutellar area reddish brown; wings hyaline; setae on body white.

HEAD. 1.1× as wide as high; 1.1× as high as long; 2.3× as wide as long; HW/TSL= 1.1; IOS 0.5× of HW; head including vertex, frons finely imbricate with dense setae; gena setigerous punctate; antennal scrobe with fine transverse reticulations ventrally, mildly smooth dorsally; central keel incomplete, reaching up to lower eye margin; lagrimal small, smooth; facial striae absent; malar striae absent; eyes densely pubescent; mandible tridentate, teeth of equal size; lateral ocelli contiguous with orbital margin; POL> LOL in ratio of 158:67; POL about 7.8× of OD; hyper occipital carina absent; occipital carina complete. A1 3.7× as long as wide, 1.1× of clava in length; A2 3.1× A3; A3 subequal in length and width; proportions of length to width of A1 to A6 (116:31), (59:27), (18:19), (13:19), (12:19), (9:23); clava 1.8× as long as wide.

MESOSOMA. Mesoscutum and mesoscutellum 0.7× and 0.6× as long as wide respectively, with same sculpture as on vertex; notauli absent; mesoscutal suprahumeral sulcus and mesoscutal humeral sulcus absent; scutoscutellar sulcus foveolate laterally towards axillula and furrow like medially; posterior mesoscutellar sulcus foveolate; metascutellum smooth; metanotal trough foveolate; propodeum with irregular longitudinal striae dorsally, medially with 2 tooth-like projections; pronotal suprahumeral sulcus absent; epomial carina absent; cervical pronotal area with same sculpture as on vertex; lateral pronotal area smooth; mesopleural pit present; mesopleural carina complete; prespecular sulcus and mesepimeral sulcus present as continuous transverse striae, extending up to mesopleural pit; femoral depression smooth; mesopleural epicoxal sulcus present; dorsal and ventral metapleural area smooth; metapleural pit distinct; metapleural sulcus foveolate anterodorsally; ventral portion of paracoxal sulcus present as a simple furrow.

WINGS. Macropterous; forewing (L:W = 64:26); m: pm: st = 4:3:8; hindwing (L:W = 54:14).

METASOMA. 1.4× as long as wide; T1 concave anteriorly, with longitudinal parallel costae throughout and a pair of lateral setae; anteromedial portion of T2 smooth and convex, longitudinally costate up to ¾ of T2 length medially and decreasing in length laterally, apically smooth; T3 longest and widest of all tergites, 1.9× as long as T2, longitudinally striate up to ¾ of its length medially and finely reticulate laterally, sparsely setose in lateral, sublateral and apical portion; T4 and T5 finely intricate, moderately setose; T6 and T7 not visible dorsally; proportions of width to length of T1 to T5 (125:56), (165:103), (281:202), (284:62), (163:29); S1 longitudinally costate; S2 longitudinally costate basally, S3–S6 with moderately dense setae.

Male

Unknown.

Biology

Host unknown.

Distribution

West Bengal ( India).

Variation

No variation was observed in the specimens examined.

Molecular characterization

The mt COI sequences of I. furvus (GenBank: OR960561, OR960564) show a minimum genetic distance of 7.8% to I. hirsutus (GenBank: OR699986).

Figures

Fig. 2. Idris furvus Sushama, Rajmohana & Debnath sp. nov., holotype, ♀ (ZSI/34234/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–E = 0.02 mm; F–H = 0.1 mm.