Dolichogenidea partergita Liu & Chen, 2018

Liu, Zhen, He, Jun-Hua & Chen, Xue-Xin, 2018, The laevigata - group of the genus Dolichogenidea Mason, 1981 from China, with descriptions of 26 new species, Zootaxa 4436 (1), pp. 1-74 : 47-48

Dolichogenidea partergita Liu & Chen , sp. n.

Figures 23 , 38

Description. Female. Body length 2.8 mm, fore wing length 3.1 mm.

Head. Transverse in dorsal view, 1.9× as wide as long and narrower than mesoscutum (28.0:31.8). Temple shiny and indistinctly coarsely punctate, rather constricted. Face relatively shiny, independently shallowly punctate, less pubescent, inner margin of eyes subparallel, nearly 0.8× as high as wide. Posterior imaginary tangent to fore ocellus virtually transecting hind two ocelli, POL:OD:OOL=5.6:2.0:3.0 Antenna as long as body, penultimate antennomere 1.7× longer than wide.

Mesosoma. Length:breadth:height=56.0:31.8:29.8. Disc of mesonotum shiny, relatively heavy punctuation, interspaces not larger than diameter of punctures and more close posterior-laterally. Scutellar sulcus a little curved, relatively narrow with carinae in between. Scutellum shiny, sparsely shallowly punctuation. Propodeum polished, with independent to confluent punctures anterior, posteral-lateral field and imaginary areola polished. Mesopleuron highly polished, its anterior half with relatively heavy independent punctuation of even size.

Legs. Spines on outer side of hind tibia numerous and close-set. Spurs of hind tibia almost of equal size, 2/5 length of basitarsus. Basitarsus of hind leg as long as tarsomeres 2–4 combined.

Wings. Pterostigma 2.5× as long as its widest part. Vein 1-R1 (metacarp) slightly longer than pterostigma, 3.7× as long as its distance from the apex of the marginal cell. Vein r arising from middle of pterostigma, as long as width of pterostigma, vein r 1.5× longer than vein 2-SR, distinctly angled at their meeting, vein 2-M half length of vein 2-SR. 1 st discal cell almost 1.2× wider than high. 1 st submarginal cell of hind wing 2.1× wider than high. Vein cu-a curved.

Metasoma. As long as thorax. T1 distinctly widened posteriorly, 1.1× longer than wide posteriorly, concave at basal 2/5, basal width 0.8× hind width, heavily coarsely punctuate in the middle, and strongly strigose posteriorly. T2 slightly curved into T3, strongly strigose as T1, 3× wider than long in the middle. T3 1.4× as long as T2. Tergites after T2 smooth. Hypopygium not shorter than apex of abdomen. Ovipositor sheath 1.8× as long as hind tibia, relatively thin.

Colour. Body mostly black, abdomen bright yellow to yellowish brown except tergites 1–2 black. Palpi, tegula and spurs pale yellow. Flagellum and ovipositor sheath evenly dark brown. Scape, pedicel, labrum, mandible reddish yellow. Legs bright reddish yellow, except coxae black, apical third of hind tibia and tarsomeres (excluding basal basitarsus) brown. Wing membrane hyaline, vein 1-R1, C+SC+R, r, 2-SR, 2-M and pterostigma brownish, other veins pale yellow, pterostigma with pale basal spot.

Variation. T2 of specimens from Hainan and Yunnan yellow and tergites posterior to T2 of some specimens from and Zhejiang partly yellowish.

Male. Unknown.

Host. Unknown.

Material examined. Holotype: ♀, Wanjia, Mayang River , Guizhou, 2007. IX.27–30, Liu Jingxian, No. 200708361 . Paratypes: 1♀, Dawuling, Xinyi, Guangdong, 2002. V.1–6, Xu Zaifu, No. 20025984 ; 1♀, Kenting National Forest Park, Pingdong, Taiwan, 2011. V.31, Tang Pu, No. 201104943 ; 1♀, Yinggeling, Hainan, 2007. V.24–25, Liu Jingxian, No. 200702643 ; 1♀, Mt. Diaoluo , Hainan, 2007. VI.1–2, Liu Jingxian, No. 200703950 ; 1♀, Mt. Gaoligong , Baoshan, Yunnan, 2006. VII.16–17, Zeng Jie, No. 200802017 ; 2♀♀, Xiaodanjiang, Mt. Leigong , Guizhou, 2005. VI.4, Zhang Hongying, Nos. 200606143, 200606181 ; 1♀, Tiantai , Zhejiang, 1988. VII.20, Chen Jianming, No. 886987 ; 4♀♀, Mt. Gutian , Zhejiang, 1986. VII.22, Lou Xiaoming, Nos. 863240, 863508, 880657, 880649 ; 1♀, Mt. Mogan , Zhejiang, 1992. VI.12, Chen Xuexin, No. 922751 ; 2♀♀, Dongyang , Zhejiang, 1987. VIII.10, Xu Weiliang, Nos. 875124, 875260 ; 1♀, Hangzhou , Zhejiang, 1997. VIII.16, He Junhua, No. 974160 ; 1♀, Mt. Tianmu , Zhejiang, 1984. VI.25, Zhu Xiliang, No. 842117 ; 1♀, Mt. Laotuding , Shenyang, Liaoning, 2011. VII.15–20, Yan Chengjin, No. 201104101 ; 1♀, Dongling, Shenyang , Liaoning, 1994. VII.10, Lou Juxian, No. 947168 ; 1♀, Mt. Laoshan , Shandong, 1995. VIII.3, Cai Ping, No. 95 8320 ; 1♀, Antu, Jilin, 1994. VIII.5–6, Lou Juxian, No. 977012 ; 1♀, Hangzhou (light trap), Zhejiang, 1979.V–VI, Wang Huiping, No. 790835 ; 1♀, Linghou , Zhejiang, 1985. VIII.6, Chen Xuexin, No. 85 24224.

Distribution. China (Guangdong, Guizhou, Hainan, Jilin, Liaoning, Shandong, Taiwan, Yunnan, Zhejiang).

Etymology. The specific name “ partergita ” derived is the Latin adjective “par”and “tergite”, referring to T2 as long as T 3 in the middle.

Remarks. This species is similar to D. paranthreneus You & Dang but differs from the latter by the following: T1 and T2 strongly rugose; disc of mesonotum more heavily and coarsely punctate; and tergites posterior to T2 mostly vivid yellow.

Figures

FIGURE 23. Dolichogenidea partergita Liu & Chen, sp. n. a head, dorsal view; b fore wing; c head, frontal view; d propodeum and metasoma, dorsal view; e habitus, lateral view; f hind wing; g mesonotum and scutellum. Scale line = 0.5 mm.

FIGURE 38. Distribution map of laevigata-group of Dolichogenidea species in China. *: Dolichogenidea parametacarp Liu & Chen, sp. n.; ■: Dolichogenidea partergita Liu & Chen, sp. n.; Δ: Dolichogenidea poliobrevis Liu & Chen, sp. n.; •: Dolichogenidea polystinelliphagous Liu & Chen, sp. n.; ♥: Dolichogenidea purdus (Papp, 1977); •: Dolichogenidea sandwico Liu & Chen, sp. n.; Ŧ: Dolichogenidea sicarius (Marshall, 1885).