Idris hirsutus Sunita and Rajmohana, 2024

Patra, Sunita, Rajmohana, K., Debnath, Rupam, Sen, Souvik, Shabnam, A. & Dinesh, K. P., 2024, A novel host association of Idris Förster (Hymenoptera: Scelionidae) with description of a new species from India, Journal of Natural History 58 (1 - 4), pp. 189-203 : 192-195

Idris hirsutus Sunita and Rajmohana , sp. n.

Zoobank: urn:lsid:zoobank.org:act:355B0F4A-3AC7-40A4-A83C-F1E642F0AA3C

Description ( Figure 2 (A–H) )

Holotype. Female [Body length. 0.907 mm (m = 0.94 (0.88–1.02) mm, SD = 0.06, n = 4)].

Colour ( Figure 2 (A ))

Frons black; eyes and ocelli black; setae white; mandibles honey yellow, honey yellowish antenna except the honey brown tip of the club; vertex and mesoscutum black; mesoscutellum black except for honey brown lateral margins; wings hyaline; legs concolorous with antenna; T1 yellowish brown, from T2 gradually brownish black; head and dorsal mesonotum covered with moderately dense white setae.

Head. ( Figure 2 (A–C, E)). Head 1.8× as wide as long, 1.1× as high as long; IOS 0.6× of head width, 1.3× of eye height; mandible tridentate, teeth of equal size; clypeus with 7 setae; central keel extending dorsal half distance of eye height; malar area setose; head including vertex, frons granulose with dense setae except smooth speculum; eyes densely pubescent; lateral ocelli contiguous to the eye boarder; POL > LOL in the ratio 33:20; POL 8.2× of OD, gena with imbricate sculpture; hyperoccipital carina absent; occipital carina complete; interantennal process rugose, protruding and truncate; facial striae absent; A1 3× longer than thick. A1 and clava subequal to equal in length; A2 2.2× A3; A4–A6 transverse; clava about 2× as long as wide.

Mesosoma. ( Figure 2 (D,E and H)). Mesosma 0.3× of body length; mesoscutum and mesoscutellum 0.73× and 0.49× as long as wide, respectively, and with same sculpture as that on vertex; notauli absent; posterior mesoscutellar sulcus foveolate; scutoscutellar sulcus laterally foveolate, medially furrow like; metascutellum flat, dorsoventrally striate; metanotal trough foveolate; lateral propodeal area produced dorsomedially into small tooth; mesopleuron comparatively smooth with less sculpture, 4 transverse ridges beneath tegula; femoral depression present; metapleuron pit present. Macropterous; forewing (L/W = 2.6) hyaline throughout; pmv present; mv:stgv:pmv = 28:93:23; stgv 2.2× as long as the marginal fringes of forewing.

Metasoma. ( Figure 2 (F–H)) Metasoma 1.4× as long as wide; T1 3.2× as wide as long and without horn; T1 longitudinally costate throughout. T2 medially longitudinally costate up to 1/3 rd distance from base, elsewhere smooth. T3 longest and widest of all tergites, 2.5× of T2 length; T3 entirely striated, finely reticulate along lateral margin. T4–T5 finely reticulate basally, smooth apically. T6–T7 dorsally not visible; proportions of width to length of T1 to T4 medially being 12:3; 20:7; 27:19; 23:4. S1 basally foveolate, laterally longitudinally striated; S2 longitudinally striated; S3–S6 uniformly granulate and moderately setose.

Male

Unknown.

Diagnosis. In the key of Lê (2000), the proposed new species runs to I. hunnus Kozlov et Lê , but differs in T1 length (0.6× of T2 length vs T1 and T2 of equal length), T3 length (0.84× of T1+ T2 length vs equal to T1+ T2 length), striation of T3 (entirely striated vs not striated). As per the key in Rajmohana (2014), this species runs to I. dubarensis Mukerjee , but it differs in the absence of notauli and longitudinal striae on T3. This species differs from all other described species of Idris by its notably dense setae on the head and mesosoma ( Figure 2 (C,E)). Holotype images of both I. hunnus and I. dubarensis at the Ohio State University’s Museum of Biological Diversity (OSU MBD) Database (https://mbd-db.osu.edu/) were also compared with the new species.

Etymology

The species epithet is hirsutus (= hairy, in Latin), due to the dense pubescence on the head and the mesosoma.

Material examined

Holotype. (ZSI/31075/H3) ♀ INDIA: Odisha: Sambalpur, Bamara, Bandhabar reserve forest, 22.033°N, 84.397°E, alt. 165 m, 21 September 2021, coll: Sunita Patra; ex egg of C. filicata . Paratypes: (ZSI/31076/H3–31081/H3) 5♀ with the same collection data as holotype (card mount) . Voucher specimens (13♀) with the same collection data as above are preserved in absolute alcohol .

Figures

Figure 2. Idris hirsutus Sunita and Rajmohana sp. n. Female. (A) Lateral habitus. (B) Antenna. (C) Dorsal view of head. (D) Lateral view of mesosoma. (E) Dorsal view of head and mesosoma. (F) Dorsal view of metasoma. (G) Ventral view of metasoma. (H) Fore wing.