Quadrastichus longiscapus, Li & Li, 2023

Li, Wen-Jian & Li, Cheng-De, 2023, Three new species of Quadrastichus Girault (Hymenoptera, Eulophidae) from China with a key to Chinese species, ZooKeys 1187, pp. 169-188 : 169

Quadrastichus longiscapus sp. nov.

Figs 19-24 , 25-26

Type material.

Holotype, female [on card], China, Jiangxi Province, Yichun City, Mt. Guan Shan, 21.VIII.2018, Xiang-Xiang Jin, Wang-Ming Li, by sweeping (deposited in YCTU). Paratypes: 7 females. [4 females on cards], same data as holotype, deposited in YCTU. [2 females on slides, 1 female on card], same locality as holotype, but collected 24.VIII.2018, deposited in NEFU.

Diagnosis.

Female. Mid lobe of mesoscutum and scutellum without reticulation. Antenna with scape distinctly extending above vertex, 4.8-5.0 × as long as broad; pedicel shorter than F1, 2.8-3.1 × as long as broad; clava distinctly shorter than F2 and F3 combined, as broad as F3, 6.3-7.0 × as long as broad, terminal spine as long as C3, flagellomeres with numerous curved long setae.

Quadrastichus longiscapus is similar to Q. xanthosoma (Graham), but can be separated from the latter by the following combination of characters: pedicel 2.8-3.1 × as long as broad (vs 2.0 ×); F1 about as long as F2 and F3, 2.8-3.0 × (vs F1 longest, 3.0-4.0 ×); clava 6.3-7.0 × as long as broad (vs 3.8-4.0 ×); body dark brown without yellow markings (vs extensively yellow with blackish markings).

Description.

Female. Body (Figs 25 , 26 ) length 1.7-1.8 mm (1.8 mm). Head with vertex dark brown, face yellow, eyes dark red, ocelli brown. Antenna with scape yellow; pedicel and flagellum brown. Mesosoma wholly dark brown or mainly dark brown with mesoscutum, posterior half of sidelobes of mesoscutum and axilla brownish, legs yellow. Wings hyaline, venation brownish. Metasoma dark brown.

Head (Fig. 19 ) in dorsal view, slightly broader than mesosoma, 2.8 × as broad as long. Vertex and face with numerous erect setae, the longest seta slightly longer than OD. Face depressed; frons without a median line; POL 1.4-1.5 × (1.4 ×) OOL, OOL 2 × OD. Malar sulcus distinctly curved; malar space 0.5 × as long as an eye; mouth opening 1.7-1.8 × (1.8 ×) as wide as malar space. Anterior margin of clypeus weakly bidentate, mandibles tridentate. Antenna (Fig. 20 ) with lower edge of antennal toruli situated above the level of lower margin of eyes, scape as long as an eye, distinctly extending above vertex, 4.8-5.0 × (5.0 ×) as long as broad; pedicel shorter than F1, 2.8-3.1 × (3.0 ×) as long as broad; 1 discoid anellus; funicle slender and thickening at base, F1 about as long as F2 and F3, F1-F3: 2.8-3.0 × (3.0 ×), 3.3-3.8 × (3.8 ×) and 3.2-3.7 × (3.7 ×) as long as broad respectively; clava distinctly shorter than F2 and F3 combined, as broad as F3, 6.3-7.0 × (6.8 ×) as long as broad, terminal spine as long as C3, flagellomeres with numerous curved long setae, sensilla few.

Mesosoma (Fig. 21 ) 1.4-1.6 × (1.4 ×) as long as broad. Pronotum subconical, arched. Mid lobe of mesoscutum about as broad as long, without median line and reticulation, with 2-3 adnotaular setae on each side. Scutellum 1.3 × as broad as long; anterior pair of setae slightly behind middle, submedian and sublateral grooves distinct, distance between submedian grooves 2.0 × as broad as distance between submedian grooves and sublateral grooves, without reticulation. Dorsellum long and posterior margin curved down, medially as long as propodeum. Propodeum without reticulation; median carina present and complete, without paraspiracular carinae; spiracles round, separated from metanotum by less than their own diameter; callus with 2 or 3 setae. Fore wing (Fig. 22 ) 2.2-2.3 × (2.3 ×) as long as broad, costal cell narrow, shorter than MV; MV 3.1-4.1 × (3.4 ×) STV; SMV with 1 dorsal seta; speculum absent; the longest marginal seta shorter than STV. Hind (Fig. 22 ) wing pointed, 12-15 × (14.5 ×) as long as broad. Legs (Fig. 23 ) slender, with metabasitarsus slightly shorter than the second tarsomere, metafemora 5.5 × as long as broad.

Gastral petiole (Fig. 24 ) transverse. Gaster lanceolate, 2.1-2.8 × (2.3 ×) as long as broad, distinctly longer than mesosoma, 1.2 × as long as head and mesosoma combined; each gastral tergite with numerous long setae on dorsal surface; each cercus with 3 setae, the longest seta 2.0 × as long as the second longest seta; ovipositor 0.8 × as long as gaster, ovipositor sheaths extending slightly beyond the tip of gaster; tip of hypopygium situated at anterior 1/3 of gaster.

Male. Unknown.

Host.

Unknown.

Distribution.

China (Jiangxi).

Etymology.

The epithetic Quadrastichus longiscapus refers to the long scape of the antennae.

Figures

Figures 19 - 24. Quadrastichus longiscapus sp. nov., paratype, female 19 head, frontal view 20 antenna, lateral view 21 mesosoma, dorsal view 22 fore and hind wings, dorsal view 23 legs, lateral view, from left to right: fore, mid, and hind legs 24 metasoma, ventral view. Scale bars: 100 μm.

Figures 25, 26. Quadrastichus longiscapus sp. nov., holotype, female 25 habitus, dorsal view 26 habitus, lateral view. Scale bars: 500 μm.