Taeniogonalos eurysoma 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

Taeniogonalos eurysoma Chen & van Achterberg sp. nov. Figs 23-25 , 26-33

Material examined.

Holotype, female, China: Tibet, Nyingchi, Yigong, 2268 m 30°15'10"N, 94°48'24"E, 5.viii.2018, sweep, SCAU 3040488 (deposited in SYSBM). Paratype: 1 female China: Tibet, Nyingchi, Yigong, 2256 m, 30°10'53"N, 94°54'30"E, 3.viii.2018, sweep net (SYSBM).

Diagnosis.

Supra-antennal elevations medium-sized (approximately 0.2 × as long as scapus) and their outer side oblique (Fig. 25 ); occipital carina narrow, non-lamelliform, smooth (Fig. 25 ); head anteriorly and posteriorly, and pronotum laterally entirely black (Figs 24 , 25 , 28 ); vertex reticulate-punctate behind stemmaticum and near eyes, becoming spaced punctate (with interspaces much wider than width of punctures) posteriorly (Fig. 25 ); mesoscutum coarsely sculptured (Fig. 29 ); notauli wide and crenulate (Fig. 29 ); scutellum coarsely rugose, convex laterally and shallowly concave medially (Fig. 29 ); metanotum slightly convex, rugose (Fig. 29 ); posterior propodeal carina distinctly arched, narrow lamelliform, foramen comparatively narrow (Fig. 29 ); posterior margin of tergites, 1st and 2nd sternites with ivory stripes (Figs 31-33 ); second sternite slightly convex (Fig. 32 ); third sternite without depression (Fig. 33 ).

Comments.

This species is close to T. alticola and it would run to that taxon (couplet 17) in the revised key of Tan et al. (2017), but can be distinguished by having smaller supra-antennal elevations, notauli wide, deep and coarsely crenulate, and wide metasomal segments.

Description.

Holotype, female, length of body 8.7 mm (of fore wing 7.8 mm).

Head. Antenna with 25 segments; frons reticulate-punctate (Fig. 24 ); vertex reticulate-punctate behind stemmaticum and near eyes, becoming spaced punctate (interspaces much wider than width of punctures) posteriorly (Fig. 25 ); temple largely smooth with few punctures at orbita and densely punctate near mandible (Fig. 28 ); head gradually narrowed behind eyes, eye in dorsal view 0.9 × as long as temple (Fig. 25 ); occipital carina narrow, non-lamelliform, smooth (Fig. 25 ); supra-antennal elevations medium-sized (approximately 0.2 × as long as scapus) and their outer side oblique (Fig. 25 ); clypeus distinctly concave and thick medio-ventrally (Fig. 24 ).

Mesosoma. Mesosoma 1.5 × as long as its dorso-ventral height (Fig. 30 ); mesopleuron largely punctate-rugose, becoming densely punctate posteriorly; transverse mesopleural groove narrow, crenulate; notauli wide, deep and coarsely crenulate; middle lobe of mesoscutum smooth antero-medially, otherwise transversely punctate-rugose, lateral lobes densely punctate anteriorly, becoming punctate-rugose posteriorly (Fig. 29 ); scutellar sulcus complete, moderately narrow and crenulate; scutellum coarsely rugose, convex laterally and shallowly concave medially, anteriorly distinctly above level of mesoscutum; metanotum slightly convex, rugose (Fig. 29 ); propodeum largely punctate-rugose, becoming smooth posteriorly (Fig. 29 ); posterior propodeal carina distinctly arched, narrow lamelliform, foramen comparatively narrow (Fig. 29 ) and as high as wide basally.

Wings. Fore wing: vein 1-M 1.1 × as long as vein 1-SR (Fig. 27 ); second submarginal cell 1.3 × as long as third cell.

Metasoma. First tergite 0.4 × as long as apically wide, smooth and with shallow but wide depression medially (Fig. 31 ); second tergite largely smooth and shiny medially, moderately punctate laterally; following tergites moderately punctate (Fig. 31 ); second sternite slightly convex, densely punctate (Fig. 32 ); third sternite without depression, densely punctate; following sternites densely punctate.

Colour. Black; outer orbita with pale yellow stripes, inner orbita with small patches near malar space (Figs 13 , 14 ); mandibles largely dark brown, with basal patches; pair of elongate patches on middle lobe of mesoscutum anteriorly, pair of patches on antero-lateral margin of scutellum, two pairs of transverse patches on metanotum; palpi, and tegulae dark brown; posterior margin of tergites, 1st and 2nd sternites with ivory stripes (Fig. 33 ); legs mainly black with tarsi dark brown; pterostigma nearly black; apical half of marginal cell of fore wing largely infuscate as area below it, remainder of wing membrane subhyaline (Fig. 27 ).

Male. Unknown.

Biology.

Unknown.

Distribution.

China (Tibet). Collected at 2256-2268 m.

Etymology.

The specific epithet originates from Greek “eurys”, wide, with reference to the wide terga of metasoma. Treat as a noun in apposition.

Figures

Figures 23 - 25. Taeniogonalos eurysoma Chen & van Achterberg, sp. nov., holotype, female (SCAU 3040488). 23 Habitus, lateral aspect 24 head, anterior aspect 25 head, dorsal aspect.

Figures 26 - 33. Taeniogonalos eurysoma Chen & van Achterberg, sp. nov., holotype, female (SCAU 3040488). 26 Antenna 27 wings 28 head, lateral aspect 29 mesosoma, dorsal aspect 30 mesosoma, lateral aspect 31 metasoma, dorsal aspect 32 metasoma, lateral aspect 33 metasoma, ventral aspect.

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.