Jezonogonalos nyingchiensis Chen & van Achterberg, 2020

Chen, Hua-Yan, Hong, Chun-Dan, van Achterberg, Cornelis & Pang, Hong, 2020, New species and new records of Trigonalyidae (Hymenoptera) from Tibet, China, ZooKeys 918, pp. 83-98 : 83

Jezonogonalos nyingchiensis Chen & van Achterberg sp. nov. Figs 12-14 , 15-22

Material examined.

Holotype, female, China: Tibet, Nyingchi, Yigong, 2256 m, 30°10'53"N, 94°54'30"E, 3.viii.2018, sweep net, SCAU 3040487 (deposited in SYSBM). Paratypes: 2 females, same data as holotype.

Diagnosis.

Occipital carina very wide medio-dorsally, with pair of curved lamellae separated by a carina (Fig. 14 ); outer side of supra-antennal elevations subvertical, smooth, and elevations approximately 0.6 × as long as scapus (Fig. 14 ); frons densely punctate dorsally and laterally, largely smooth ventrally and medially (Fig. 13 ); supra-antennal elevations largely ivory dorsally (Fig. 14 ); mandible mainly black, except dark brown base of teeth (Fig. 13 ); metasoma dorsally largely smooth and largely black (Fig. 20 ); first tergite approximately 0.7 × as long as its apical width (Fig. 20 ); third sternite approximately 0.4 × as long as second sternite (Fig. 22 ).

Comments.

This species is similar to J. shaanxiensis from Shaanxi (NW China) and it would run to that taxon (couplet 7) in the key of Tan et al. (2017), but can be distinguished by having the frons largely smooth medially and the mesopleuron mainly punctate-rugose, but narrowly smooth posteriorly.

Description.

Holotype, ♀, length of body 11.8 mm (of fore wing 9.8 mm).

Head. Antenna with 25 segments; frons densely punctate dorsally and laterally, with medium-sized whitish setae, largely smooth ventrally and medially (Fig. 13 ); vertex largely smooth, moderately punctulate behind posterior ocellus (Fig. 14 ); temple largely smooth, punctulate (Fig. 17 ); head hardly narrowed behind eyes, eye in dorsal view 1.1 × as long as temple (Fig. 14 ); occipital carina strongly widened and pair of circular lamellae medio-dorsally, separated by a distinct carina (Figs 14 , 17 ), laterally distinctly crenulate; supra-antennal elevations distinctly enlarged (approximately 0.6 × as long as scapus), smooth and outer side subvertical; clypeus concave and thick medio-ventrally and area above it convex and obtusely protruding (Fig. 13 ).

Mesosoma. Mesosoma 1.7 × as long as its dorsoventral height (Fig. 19 ); mesopleuron mainly punctate-rugose, narrowly smooth posteriorly; notauli wide, deep and coarsely crenulate; middle lobe of mesoscutum smooth antero-medially, otherwise transversely punctate-rugose, lateral lobes mainly punctate except for a smooth line (Fig. 18 ); scutellar sulcus wide and coarsely crenulate; scutellum coarsely punctate and laterally with smooth spaces between longitudinal rugae, flattened, in lateral view below level of metanotum (Fig. 18 ); metanotum medially protruding, obtuse and densely and finely punctate (Fig. 18 ); propodeum antero-laterally irregularly rugulose to smooth, remainder coarsely transversely rugose and shiny medially, and smooth posteriorly (Fig. 18 ); posterior propodeal carina thick lamelliform (foramen approximately 4 × as wide as high medially).

Wings. Fore wing: length of vein 1-M 1.4 × as long as vein 1-SR; third submarginal cell much wider anteriorly than petiolate second cell (Fig. 16 ).

Metasoma. First tergite 0.7 × as long as its apical width, smooth but basal depression anteriorly with some crenulae (Fig. 20 ); second and following tergites shiny and smooth except for punctulation; sternites rather sparsely finely punctate, with wide smooth interspaces; second sternite weakly curved in lateral view; third sternite approximately 0.4 × as long as second sternite (Fig. 22 ); hypopygium triangularly protruding in ventral view (Fig. 21 ).

Colour. Black; inner orbita narrowly ivory and connected to ivory malar space; pair of faint patches on clypeus, basal patch of mandible, large patch on supra-antennal elevations, large patch on anterior margin of pronotum, pair of elongate patches on middle lobe of mesoscutum anteriorly, pair of narrow lines near tegulae, epipleura of tergites, large patch apico-laterally on second tergite and narrow apical bands of sternites ivory; mandible teeth dark brown basally (Fig. 13 ); tegulae mainly dark brown; palpi dark brown; legs mainly black, but fore femur apico-ventrally brownish; pterostigma basally yellow, and remainder dark brown; large area below pterostigma dark brown and remainder of wing membrane subhyaline (Fig. 18 ).

Variations. Length of body 10.8-11.2 mm, of fore wing 8.9-9.4 mm; metanotum black or with pair of faint ivory spots medially; ivory patches of clypeus and mesoscutum rather small to large; length of vein 1-M of fore wing 1.3-1.5 × as long as vein 1-SR.

Male. Unknown.

Biology.

Unknown.

Distribution.

China (Tibet). Collected at 2256 m.

Etymology.

Named after Nyingchi County, where it was collected. Treat as an adjective in apposition.

Figures

Figures 12 - 14. Jezonogonalos nyingchiensis Chen & van Achterberg, sp. nov., holotype, female (SCAU 3040487). 12 Habitus, lateral aspect 13 head, anterior aspect 14 head, dorsal aspect.

Figures 15 - 22. Jezonogonalos nyingchiensis Chen & van Achterberg, sp. nov., holotype, female (SCAU 3040487). 15 Antenna 16 wings 17 head, lateral aspect 18 mesosoma, dorsal aspect 19 mesosoma, lateral aspect 20 metasoma, dorsal aspect 21 metasoma, lateral aspect 22 metasoma, ventral aspect.