Closterocerus unifasciatus Li & Li, 2021

Li, Ming-Rui & Li, Cheng-De, 2021, Four new species of Closterocerus Westwood (Hymenoptera, Eulophidae) from China, with a key to Chinese species, ZooKeys 1017, pp. 21-36 : 21

Closterocerus unifasciatus Li & Li sp. nov. Figs 28 , 29-35

Type material.

Holotype: ♀ [NEFU; on slide], China, Liaoning Province, Anshan City, Mountain Qian Shan, 25.VI.2015, Hui Geng, Si-Zhu Liu, Zhi-Guang Wu and Yan Gao, sweeping. Paratypes: 1♀ [on slide], same data as holotype; 2♀ [1 on slide and 1 in alcohol], China, Heilongjiang Province, Yichun City, Dailing District, Liangshui Forestry Station, 29.VII.2015, Xin-Yu Zhang, Si-Zhu Liu and Xing-Yue Jin, sweeping; 1♀ [on card], China, Liaoning Province, Anshan City, Mountain Qian Shan, 23.VI.2015, Hui Geng, Si-Zhu Liu, Zhi-Guang Wu and Yan Gao, sweeping.

Diagnosis.

Face near clypeus with a curved, nearly V-shaped transverse carina; clypeus delimited laterally; F4 widest; fore wing with band I absent; band II becoming paler and wider posteriorly; band III extending along apical margin, much obscure (nearly imperceptible on slide); propodeum smooth and shiny, without any carina, spiracular sulcus present.

Description.

Female. Length 0.9-1.0 mm. Scape with basal 3/5 pale brown and remainder part brown; pedicel dark brown. Funicle dark brown, clava dark brown to pale brown, becoming gradually paler from F3 to F5. Eyes and ocelli dull red. Vertex and frons above frontal sulcus golden-green, golden-blue, or golden-red. Frons below frontal sulcus golden-yellow to golden-green. Gena brown without metallic reflection. Mandibles pale brown. Pronotal collar, mesoscutum, mesoscutellum, axillae and propodeum golden-green, occasionally golden-red, in dorsal view, golden-blue in lateral view. Legs with pro- and mesocoxae pale brown, metacoxae brown; all femora and metatibiae brown, except about apical 2/7 of metatibiae pale yellow; pro- and mesotibiae mainly pale yellow, except basal part pale brown; all tarsi pale yellow and claws dark. Fore wing (Figs 28 , 33 ) with band I absent; band II becoming paler and wider posteriorly; band III extending along apical margin of fore wing, much obscure (nearly imperceptible on slide). Metasoma concolorous with mesosoma, except median part of tergum 2 and 5, whole tergum 4, brown, with weak metallic reflections.

Head (Figs 29 , 30 ), in frontal view 1.2 times as wide as high. Vertex and frons with irregular sculpture. POL: OOL = 15: 8. Frontal sulcus V-shaped, reaching eye margins; inner eye margins hardly concave. Antennal scrobes join on frontal sulcus. Subtorular sulci present and long. Malar sulcus absent, but with a curved, nearly V-shaped transverse carina near clypeus, extending to near lower margin of eyes. Clypeus delimited laterally. HE: MS: WM about 4.3: 1.0: 2.0. Antennae (Fig. 31 ) inserted above level of lower margin of eyes. Scape compressed, 4.8 times as long as wide. Pedicel moderately compressed compared to the compressed scape, approx. twice as long as wide. Flagellum compressed, with two funicular segments and three claval segments. F1-F3 wider than long; F2 slightly wider and longer than F1; F3, widest of all segments of antenna; F4 quadrate; F5 tapering distad, with terminal spine long and as long as the segment.

Mesosoma (Fig. 32 ). Pronotum, mesoscutum, mesoscutellum, axillae and metascutellum with reticulate sculpture, meshes nearly of same size. Median area of midlobe of mesoscutum with two pairs of setae. Notauli curved in anterior part, and indicated posteriorly by depressions. Mesoscutellum approx. as long as wide. Axillae slightly advanced forwards in front of level of anterior margin of mesoscutellum. Mesoscutum and mesoscutellum flat. Metascutellum about 3/4 as long as median length of propodeum. Propodeum smooth, without any carina and plica, spiracular sulcus present. Fore wing (Fig. 33 ) slightly more than twice as long as wide, with a stigmal hairline, radial cell bare. Speculum closed below. Ratio length of: SMV: MV: PMV: STV about 5: 10: 1: 2. Cubital setal line straight and completely extending to base of MV. Hind wing (Fig. 33 ) much narrow, about seven times as long as wide. Legs (Fig. 35 ) normal.

Metasoma (Fig. 34 ). Ovate; petiole short, pyriform; ovipositor exserted beyond apex of metasoma.

Male. Unknown.

Host.

Unknown.

Etymology.

The name refers to the single cross band in the fore wing (uni is Latin for one, single and fasciatus is Latin for banded).

Distribution.

China (Heilongjiang, Liaoning provinces).

Remarks.

Closterocerus unifasciatus shares with C. brachyphagus Hansson, 1994 the distinct transverse band below the STV in the fore wing. The new species differs in having the mesoscutellum reticulate (smooth, without any trace of reticulation in C. brachyphagus ); propodeum smooth, without any carina (with a weak median carina in C. brachyphagus ) and fore wing with speculum closed below (open in C. brachyphagus ).

Figures

Figure 28. Closterocerus unifasciatus Li & Li, sp. nov., holotype, female, habitus in lateral view, before dissection. Scale bar: 200 μm.

Figures 29 - 35. Closterocerus unifasciatus Li & Li, sp. nov., holotype, female, on slide (except 29 and 32, which are photographed before slide-mounting): 29 head, frontal view 30 mandibles 31 antenna 32 mesosoma 33 fore- and hind wings 34 metasoma, lateral view 35 legs, from left to right: fore, mid and hind leg. Scale bars: 100 μm.