Dolichogenidea ancylotergita 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 : 11

Dolichogenidea ancylotergita Liu & Chen , sp. n.

Figures 3 , 35

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

Head. Transverse in dorsal view, 2× as wide as long and narrower than mesoscutum (28.0:31.0). Temple shiny and indistinctly punctate, constricted. Face relatively shiny, a little bulged medially, independently shallow punctate, less pubescent, inner margin of eyes parallel, 0.8× as high as wide. Posterior tangent to the anterior ocellus touching the posterior pair, POL:OD:OOL=5.0:1.9:4.0. Antenna as long as body, penultimate antennomere 1.3× as long as wide.

Mesosoma. Length:breadth:height=50.0:31.8:31.5. Disc of mesonotum shiny, finely punctate, interspaces equal to diameter of punctures, indistinctly punctate posteriorly. Scutellar sulcus curved, narrow with carinae in between. Scutellum shiny, polished with hardly visible punctures. Propodeum shiny, polished, with indistinct coarse punctures anteriorly, two short arms reaching out from orifice, forming a U-shape medially. Mesopleuron highly polished, its anterior half with shallow hair punctuation of even size.

Legs. Hind femur short, 2.6× longer than wide. Spines on outer side of hind tibia dispersed. Spurs of hind tibia of equal size, 2/5 length of basitarsus. Basitarsus of hind leg slightly longer than tarsomeres 2–4 combined.

Wings. Pterostigma 3.0× as long as its widest part. Vein 1-R1 (metacarp) slightly longer than pterostigma, 4.8× as long as its distance from the apex of the marginal cell. Vein r distally to middle of pterostigma, equal to width of pterostigma, vein r almost as long as vein 2-SR, indistinctly angled at their meeting, vein 2-M half length of vein 2- SR. 1 st discal cell a little wider than high (23.0:20.0). 1 st submarginal cell of hind wing 2.2× wider than high. Vein cu-a curved.

Metasoma. As long as thorax. Strongly downcurved. T1 with slightly arched sides, as long as wide posteriorly, concave at basal 2/5, basal to hind width as 10.5:13.5, shiny, uneven, with relatively strong rugae posteriorly 3/5. T2 point to T1 anterior-medially, 3.4× wider than long in the middle, uneven and punctate-rugulose. T3 1.7× as long as T2. Tergites after T2 shiny, smooth. Hypopygium slightly shorter than apex of abdomen. Ovipositor sheath 0.9× as long as hind tibia, relatively thin.

Colour. Body black, except T3–T5 whitish posteriorly. Palpi, tegula and spurs pale yellow. Flagellum and ovipositor sheath evenly dark brown. Labrum and mandible reddish yellow. Legs reddish yellow to brown, except coxae dark brown, hind femur, most of mid femur and apical third of hind tibia dark brown. Wing membrane hyaline, vein 1-R1, r, 2-SR, 2-M, C+SC+ R and pterostigma brownish, and other veins yellowish brown, pterostigma with pale basal spot.

Variation. Fore wing length 3.1–3.5 mm.

Male. Unknown.

Host. Unknown.

Material examined. Holotype: ♀, Wanglang Natural Reserve , Sichuan, 2006. VII.26, Gao Zhilei, No. 200612858 . Paratypes: 1♀, Wanglang Natural Reserve , Sichuan, 2006. VII.26, Zhang Hongying, No. 200615365 ; 1♀, Wanglang Natural Reserve , Sichuan, 2006. VII.21, Zhang Hongying, No. 200612276 ; 1♀, Erlonghe, Jingyuan , Ningxia, 2008. VII.3, Yao Jiemin, No. 200808389 ; 1♀, Longtanlin, Jingyuan , Ningxia, 2008. VII.6, Yao Jiemin, No. 200808179.

Distribution. China (Ningxia, Sichuan).

Etymology. The specific name “ ancylotergita ” derived from the Latin prefix “ancylo-” and noun “tergite”, referring to the strongly downcurved metasoma.

Remarks. This species is extremely similar to D. sophiae (Papp) but can be separated from the latter by the following: ovipositor sheath nearly as long as hind tibia; hypopygium not produced into a spinule; and tegula pale yellow.

Figures

FIGURE 3. Dolichogenidea ancylotergita Liu & Chen, sp. n. a head, frontal view; b head, dorsal view; c propodeum and T1– 3; d habitus, lateral view; e fore wing; f T4–6; g hind wing; h mesonotum and scutellum. Scale line = 0.5 mm.

FIGURE 35. Distribution map of laevigata-group of Dolichogenidea species in China.*: Dolichogenidea aberrantenna Liu & Chen, sp. n.; ■: Dolichogenidea aegeriphagous Liu & Chen, sp. n.; Δ: Dolichogenidea ancylotergita Liu & Chen, sp. n.; •: Dolichogenidea anteruga Liu & Chen, sp. n.; ♥: Dolichogenidea biconcava Liu & Chen, sp. n.;•: Dolichogenidea brevifacialis Liu & Chen, sp. n.; Ŧ: Dolichogenidea breviventris (Ratzeburg, 1848).