Latuspina shaanxinensis Wang, Pujade-Villar & Guo, 2016

Wang, Yiping, Guo, Rui, Pujade-Villar, Juli, Wang, Shijun & Chen, Xuexin, 2016, Review of the genus Latuspina (Hymenoptera: Cynipidae), with descriptions of two new species and their host galls, Zoological Systematics 41 (1), pp. 82-88 : 85-87

Latuspina shaanxinensis Wang, Pujade-Villar & Guo , sp. nov. ( Figs 12–21 )

Material examined. Holotype. ♀, China, Shaanxi, Houzhenzi (107°47′E, 33°50′N), 2011-VI-18, Rui Guo.

Etymology. The new species is named after type specimens collecting location.

Diagnosis. This new species, Latuspina shaanxinensis Wang, Pujade-Villar & Guo , sp. nov., is only known by females morphologically. It is similar to L. strips , but it can be separated from the latter by characters as follows: shorter on ventral spines ( Fig. 18 ) (two lateral ventral spines and meddle ventral spine uniformly slightly longer on L. strips ), antenna with 14 segments ( Fig. 16 ) (13 segments in the rest of species), mesoscutum basal smooth (alutaceous in L. strips ), median mesoscutal line indicated by narrow stripes of alutaceous sculpture in L. shaanxinensis Wang, Pujade-Villar & Guo , sp. nov. ( Fig. 15 ) (absent in L. strips ) and lateral propodeal carinae curved outwards in posterior 1/2 ( Fig. 20 ) (without propodeal carinae and uniformly dull coriaceous in L. strips ).

Description. Female. Length. Female body length 2.1 mm, fore wing 2.4 mm; male known.

Color. Head, mesosoma, and metasoma uniformly and entirely black; mandibles brown, palpi light brown to yellowish; legs yellow, except darker basis of coxae; scape brown, pedicel, F1 and F2 light brown to yellowish, subsequent flagellomeres darker; hypopygium light brown.

Head ( Figs 12–13 ). Head transverse in anterior view, delicately alutaceous, with a very few white setae, which denser on lower face; 2.2 times as broad as long from above; 1.6 times as broad as high in anterior view and broader than mesosoma. Gena alutaceous, not broadened behind eye, more than twice narrower than cross diameter of eye, invisible in anterior view. Malar space alutaceous, with striae irradiating from clypeus extending to eye margin, 0.1 times as long as height of eye, without malar sulcus. POL 1.3 times as long as OOL; OOL 4.0 times as long as diameter of lateral ocellus, 2.0 times as long as LOL; ocelli ovate. Transfacial distance 1.3 times as long as height of eye and 1.4 times as long as height of lower face (distance between antennal rim and ventral margin of clypeus); diameter of antennal socket slightly larger than distance between sockets, and nearly equal to distance between eye margin and socket. Lower face delicately uniformly alutaceous, with narrow elevated median area and very few setae; striae irradiating from clypeus but not extending to torulus. Clypeus small, shiny, distance between clypeus and margin of eye nearly 1.5 times as long as width of clypeus, with slightly elevated central coriaceous part, with very indistinct anterior tentorial pits, indistinct epistomal sulcus and clypeo-pleurostomal line; ventrally emarginate and not incised medially. Frons flat, micropunctate, with rounded impressed area below median ocellus; vertex and occiput very delicately micropunctate, shiny; interocellar area elevated, with stronger sculpture than vertex. Postocciput delicately coriaceous, shiny, around occipital foramen impressed, with few delicate striae extending to level of gula.

Antenna ( Fig. 16 ). Antenna with 13 flagellomeres, as long as body; scape and pedicel strongly broadened, respectively both as long as broad, F1 2.6 times as long as pedicel, 1.5 times as long as F2, F2 slightly longer than F3, F1 and F2 slightly narrower than all subsequent flagellomeres; ratio of scapus, pedicel and F1–F13 as follows: 9: 8: 21: 14: 13: 13: 13: 12: 8: 9: 8: 8: 8: 8: 7. Placodeal sensilia on F7–F13.

Mesosoma ( Figs 14–15, 20 ). Mesosoma slightly longer than high in lateral view, with very few setae. Pronotum shiny, delicately coriaceous; with some irregular wrinkles postero-laterally, emarginated along lateral edge. Anterior half of mesoscutum smooth, shiny; posterior half of mesoscutum delicately rugose, as long as broad (width measured across basis of tegulae); notauli absent but indicated by narrow stripes of alutaceous sculpture, absent in posterior 1/3; median mesoscutal line absent but indicated by narrow stripes of alutaceous sculpture, absent in anterior 1/2; parapsidal lines and anterior parallel lines absent. Transscutal articulation absent. Dorsoaxillar area smooth, shiny, with few short setae. Mesoscutellum longer than broad, with parallel sides, 0.6 times shorter than length of mesoscutum, uniformly rugose, overhanging metanotum, with distinct rim laterally and posteriorly. Scutellar foveae absent, replaced by deep and narrow transverse area, with coriaceous bottom. Mesopleuron coriaceous, with dense transverse parallel delicate ridges; speculum smooth, shiny; mesopleural triangle rugose, with strong irregular wrinkles, shiny. Metapleural sulcus reaching mesopleuron at upper 1/3 height; preaxilla delicately coriaceous, shiny; lateral axillar area with parallel wrinkles, without setae; axillar carina broad, with longitudinal striae; axillula slightly ovate, uniformly rugose, with few setae; subaxillular bar shiny, smooth, in most posterior end as high as height of metanotal trough. Metascutellum uniformly coriaceous, higher than height of smooth, shiny ventral impressed area; metanotal trough smooth, shiny, without setae. Propodeum uniformly dull coriaceous, with few setae; lateral propodeal carinae distinct, curved outwards in posterior 1/2; mid-carinae distinct, divided into lateral propodeal areas; lateral propodeal area uniformly dull coriaceous, without setae. Tarsal claws simple, without basal lobe.

Wing ( Fig. 19 ). Forewing longer than body, margin with long dense cilia; radial cell of forewing 3.6 times as long as broad, veins R 1 and Rs reaching wing margin; areolet small, triangular, well-delimited; vein Rs+M well traceable, nearly reach basalis, slightly below lower half.

Metasoma ( Figs 17–18 ). Metasoma shorter than head+mesosoma, higher than long in lateral view, smooth, shiny, without setae laterally; 2nd metasomal tergite extending dorsally to 1/3 length of metasoma; prominent part of ventral spine of hypopygium with two short subapical lateral lumps, spine tri-forked but central part very short, each lump with 5–8 long setae extending far beyond apex.

Gall ( Fig. 21 ). Almost discoid, an integral swelling leaf gall locate at beside of leaf midrib with irregularly shaped and a single larval chamber. Mature gall brown, reaches 1.5 mm in diameter.

Biology. Only the sexual generation is known, inducing leaf vein galls on Quercus leaves. Galls are appearing on the tree from early May, developing and maturing through the summer and in late October. Under the laboratory conditions, adults emerged from late September.

Distribution. China (Shaanxi).

Funding The project was supported by the National Natural Science Foundation of China (31472032, 31071970) and Zhejiang Provincial Natural Science Foundation for Distinguished Young Scholars (LR14C040002), Science Foundation of Zhejiang A & F University and a scholarship under the Zhejiang Association for International Exchange of Personnel .

Figures

Figures 12–21. Latuspina shaanxinensis Wang, Pujade-Villar & Guo, sp. nov. 12. Head, anterior view. 13. Head, dorsal view. 14. Mesosoma, lateral view. 15. Mesosoma, dorsal view. 16. Antenna. 17. Metasoma, lateral view. 18. Ventral spine of hypopygium, lateral view. 19. Forewing. 20. Propodeum, posterodorsal view. 21. Gall. Scale bars: 12–15, 17–18, 20=0.1 mm, 16, 19=0.2mm.