Quadrastichus longiseta, 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 longiseta sp. nov.

Figs 1-6 , 7, 8 , 9-10

Type material.

Holotype, female [on card], China, Jiangxi Province, Yichun City, Mt. Guan Shan, 25.VIII.2018, Xiang-Xiang Jin, Wang-Ming Li, by sweeping (deposited in YCTU). Paratypes: 3 females, 1 male. [1 female, 1 male on slides], same data as holotype; [1 female on slide, 1 female on card], same locality as holotype, but collected 24.VIII.2018. All paratypes are deposited in NEFU.

Diagnosis.

Female. Body mainly dark brown with weak metallic reflections. Antenna with scape just reaching, not extending above vertex, 4.3-4.6 × as long as broad; pedicel longer than F1; funicle slender and thickening at base of each each funicular segment, F1 shortest, F2 shorter than or as long as F3, clava distinctly longer than F2 and F3 combined, 6.0-7.0 × as long as broad, terminal spine as long as C3, flagellum with numerous curved long setae on each segment. Male. Body black with bluish metallic reflection. Antenna with plaque 0.5 × the length of scape, flagellum with numerous whorls of long setae at base of each segment, especially on funicular segments.

Following Graham (1991), Q. longiseta should belong in the Quadrastichus anysis -group as follows: body black with yellow markings; frons with median area but without median carina; malar sulcus curved. This species is similar to Q. anysis (Walker), but can be separated from this species by the following combination of characters: pedicel longer than F1 (vs as long as); F1 shortest, F2 shorter than or as long as F3 (vs F1-F3 subequal in length); clava distinctly longer than F2 and F3 combined, 6.0-7.0 × as long as broad (vs clava as long as F2+F3, 3.2-3.9 × as long as broad).

Description.

Female. Body (Figs 9 , 10 ) length 0.9-1.1 mm (1.1 mm). Head dark brown, eyes reddish-white, ocelli white. Antenna with scape yellowish-white; pedicel and flagellum yellowish-brown. Mesosoma dark brown, legs with pro- and metacoxae mainly brown, mesocoxae yellowish with base brown, trochanters, femora, tibiae and basal three tarsomeres yellowish, 4th tarsomere yellowish-brown. Wings hyaline, venation brownish. Gaster dark brown, with 1-3 yellow bands dorsally.

Head (Fig. 1 ) in dorsal view, slightly broader than mesosoma, 2.2 × as broad as long. Vertex and face with numerous erect setae, the longest seta as long as OD. Face depressed; frons with a fine median line; POL 1.5-1.6 × (1.5 ×) OOL, OOL 2 × OD. Malar sulcus distinctly curved; malar space 0.6 × as long as an eye; mouth opening 1.3-1.4 × (1.3 ×) as wide as malar space. Anterior margin of clypeus weakly bidentate, mandibles tridentate. Antenna (Fig. 2 ) with lower edge of antennal toruli situated above lever of lower margin of eyes, scape as long as an eye, just reaching but not extending above vertex, 4.3-4.6 × (4.5 ×) as long as broad; pedicel longer than F1, 2.3 × as long as broad; 1 discoid anellus; funicle slender and thickening at base, F1 shortest, F2 shorter than or as long as F3, F1-F3: 1.8-2.0 × (2.0 ×), 2.3-2.6 × (2.5 ×) and 2.3-2.8 × (2.5 ×) as long as broad respectively; clava distinctly longer than F2 and F3 combined, as broad as F3, 6.0-7.0 × (6.7 ×) as long as broad, terminal spine as long as C3, flagellomeres with numerous curved long setae, sensilla few.

Mesosoma (Figs 3 , 9 ) 1.4-1.5 × (1.4 ×) as long as broad. Pronotum subconical, arched, reticulation fine. Mid lobe of mesoscutum 1.2-1.3 × (1.2 ×) as broad as long, without median line, with 1 adnotaular seta on each side situated in posterior half, reticulation dense and narrow. Scutellum 1.3 × as broad as long; anterior pair of setae attached slightly behind the middle, submedian and sublateral grooves distinct, distance between submedian grooves 1.8-2.0 × as broad as distance between submedian grooves and sublateral grooves, reticulation dense. Dorsellum about 2.0 × as broad as long. Propodeum medially distinctly longer than dorsellum, reticulation extremely fine; median carina weak, only present in posterior half, without paraspiracular carinae; spiracles round, separated from metanotum by less than their own diameter; callus with 2 or 3 setae. Fore wing (Fig. 4 ) 2.2-2.3 × (2.3 ×) as long as broad, costal cell narrow, shorter than MV; MV 3.3-4.0 × (3.8 ×) STV; SMV with 1 dorsal seta; speculum absent; the longest marginal seta slightly longer than STV. Hind (Fig. 4 ) wing pointed, 9.4 × as long as broad. Legs (Fig. 5 ) slender, with meso- and metabasitarsus as long as the corresponding second tarsomere, metafemora 5.1 × as long as broad.

Gastral petiole (Fig. 6 ) present and transverse. Gaster ovate (Fig. 6 ), 1.5-1.8 × (1.5 ×) as long as broad, slightly longer and broader than mesosoma, slightly shorter than head and mesosoma combined; each gastral tergite with long erect setae on dorsal surface; each cercus with 3 setae, the longest seta 2.3 × as long as the second longest seta; ovipositor 0.7 × as long as gaster, ovipositor sheaths extending slightly beyond the tip of gaster; tip of hypopygium situated slightly before middle of gaster.

Male. Body length 0.9 mm. Mostly similar to female. Antenna (Fig. 7 ) with scape robust, shorter than an eye, 2.5 × as long as broad; plaque 0.5 × as long as scape; pedicel 1.7 × as long as broad; F1-F4: 1.3 ×, 2.4 ×, 2.8 × and 3.5 × as long as broad respectively; each flagellomere with numerous whorls of long setae at base, especially on the funicle. Fore wing (Fig. 8 ) with MV 3.5 × as long as STV.

Host.

Unknown.

Distribution.

China (Jiangxi).

Etymology.

The epithet Quadrastichus longiseta refers to the long setae on the antennae in both sexes.

Figures

Figures 1 - 6. Quadrastichus longiseta sp. nov., paratype, female 1 head, frontal view 2 antenna, lateral view 3 mesosoma, dorsal view 4 fore and hind wings, dorsal view 5 legs, lateral view, from left to right: fore, mid, and hind legs 6 metasoma, ventral view. Scale bars: 100 μm.

Figures 7, 8. Quadrastichus longiseta sp. nov., paratype, male 7 antenna, lateral view 8 fore and hind wings, dorsal view. Scale bars: 100 μm.

Figures 9, 10. Quadrastichus longiseta sp. nov., holotype, female 9 habitus, dorsal view 10 habitus, lateral view. Scale bars: 300 μm.