Dolichogenidea changbaiensis 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 : 20

Dolichogenidea changbaiensis Liu & Chen , sp. n.

Figures 8 , 36

Description. Female. Body length 2.2 mm, fore wing length 2.6 mm.

Head. Transverse in dorsal view, 2× as wide as long and a little wider than mesoscutum (25.0:22.9). Temple relatively shiny and very shallowly punctate, constricted. Face relatively dull, with small punctations, sparsely pubescent, inner margin of eyes converged below, nearly 0.7× as high as wide. Ocelli relatively small, distance between fore and a hind ocellus longer than diameter of an ocellus, posterior imaginary tangent to fore ocellus virtually touching hind two ocelli, POL:OD:OOL=3.8:2.0:3.0. Antenna distinctly longer than body, penultimate antennomere over twice longer than wide.

Mesosoma. Length:breadth:height=34.5:22.9:25.5. Disc of mesonotum relatively shiny, deep punctures, interspaces smaller than diameter of punctures. Scutellar sulcus nearly straight, a little wide and with 10 carinae inbetween. Scutellum relatively shiny, with shallow sparse punctures. Propodeum shiny, with setose dense macropunctures anterior-laterally, distinctly concave and polished medially, posteral-lateral polished field with several rugae. Mesopleuron highly polished, with shallow setose punctures anteriorly.

Legs. Hind femur slightly shorter (3.3× longer than wide). Spines on outer side of hind tibia relatively thick. Inner spur of hind tibia nearly half of hind basitarsus, outer spur distinctly shorter (3/10). Basitarsus of hind leg weakly shorter than tarsomeres 2–4 combined (14.0:15.0).

Wings. Pterostigma 3.5× as long as its widest part. Vein 1-R1 (metacarp) 1.3× longer than pterostigma, 6.8× as long as its distance from the apex of the marginal. Vein r arising from apex of pterostigma, almost as long as width of pterostigma, vein r weakly longer than (or as long as) vein 2-SR, distinctly angled at their meeting, vein 2-M 2/3 length of vein 2-SR. 1 st discal cell nearly 1.3× wider than high. 1 st submarginal cell of hind wing 2× wider than high. Vein cu-a strongly curved.

Metasoma. Shorter than thorax (34.5:40.0). T1 gradually distinctly constricted to apex, 1.7× longer than wide posteriorly, indistinctly concave at basal two fifth, turned-over part shiny, rugose, polished posteriorly bump. T2 shiny, a little uneven, weakly curved into T3, 2.7× wider than long in the middle. T3 1.5× longer than T2. Tergites after T2 shiny, polished, pubescent. Hypopygium shorter than apex of abdomen. Ovipositor sheath only 2/3 length of hind tibia, a little wide and parallel-sided, setae long.

Colour. Body black. Tegula black. Spurs pale yellow. Palpi yellowish brown. Antenna and ovipositor sheath evenly dark brown. Labrum and mandible dark red. Legs bright reddish yellow, coxae dark-brown, distal hind tibia and tarsus more or less fumous. Wing membrane hyaline, vein 1-R1, C+SC+ R and its upper side of brown, pterostigma and other veins yellowish.

Variation. Body length 2.3–3.0mm.

Male. Unknown.

Host. Unknown.

Material examined. Holotype: ♀, Mt. Changbai , Jilin, 1984. VIII.4, Lou Juxian, No. 951972 . Paratypes: 2♀♀, Mt. Changbai, Jilin, 1984. VIII.4, Lou Juxian , Nos. 952 0 0 3, 952030.

Distribution. China (Jilin).

Etymology. The specific name “ changbaiensis ”, referring to it distributes in Mt. Changbai (Jilin).

Remarks. This species is extremely similar to D. parametacarp Liu & Chen , sp. n., but differs from the latter by the following: legs bright reddish yellow (the latter dark brown); head a little wider than mesoscutum (the latter narrower); and T1 rugose (the latter at most shallowly punctate).

Figures

FIGURE 8. Dolichogenidea changbaiensis Liu & Chen, sp. n. a propodeum; b fore wing; c head, frontal view; d mesonotum and scutellum; e metasoma, dorsal view; f hind wing; g head, dorsal view; h habitus, lateral view. Scale line = 0.5 mm.

FIGURE 36. Distribution map of laevigata-group of Dolichogenidea species in China. *: Dolichogenidea changbaiensis Liu & Chen, sp. n.; ■: Dolichogenidea concentricus Liu & Chen, sp. n.; Δ: Dolichogenidea dioryctriphagous Liu & Chen, sp. n.; •: Dolichogenidea fumeus Liu & Chen, sp. n.; ♥: Dolichogenidea funalicauda Liu & Chen, sp. n.;•: Dolichogenidea gansuensis Liu & Chen, sp. n.; Ŧ: Dolichogenidea indicaphagous Liu & Chen, sp. n.