Taeniogonalos albidorsalis Zhang & Chen, 2022

Zhang, Bing-Lan, Yan, Cheng-Jin, van Achterberg, Cornelis, Peng, Yan-Qiong & Chen, Hua-Yan, 2022, Integrated taxonomy unveils new species of Trigonalyidae (Insecta, Hymenoptera) from Yunnan, China, Journal of Hymenoptera Research 90, pp. 101-128 : 101

Taeniogonalos albidorsalis Zhang & Chen sp. nov.

Figs 7 , 8

Diagnosis.

Supra-antennal elevations approximately 0.4 × as long as scapus and their outer side oblique (Fig. 7C ); occipital carina narrow, non-lamelliform, smooth (Fig. 7C ); head anteriorly and posteriorly black, pronotum white dorsally, tegulae dark brown (Figs 7B, C , 8C, D ); vertex largely sparsely and finely punctate, with rather coarse punctures and slightly rugose media-posteriorly (Fig. 7C ); mesoscutum coarsely sculptured in dorsal view (Fig. 8C ); notauli wide and crenulate (Fig. 8C ); scutellum coarsely rugose, convex laterally and shallowly concave medially (Fig. 8C ); metanotum slightly convex, rugose (Fig. 8C ); posterior propodeal carina distinctly arched, narrow lamelliform, foramen comparatively narrow (Fig. 8D ); posterior margin of tergites with brownish stripes (Fig. 8E ); first sternite dark brown posteriorly (Fig. 8F ); second sternite slightly convex (Fig. 8F ); third sternite without depression (Fig. 8F ).

Description.

Female. Holotype, length of body 7.1 mm (of fore wing 5.9 mm).

Head. Antenna with 22 segments; frons reticulate-punctate (Fig. 7B ); vertex largely sparsely and finely punctate, with rather coarse punctures and slightly rugose media-posteriorly (Fig. 7C ); temple largely smooth with few punctures at orbita (Fig. 8B ); head gradually narrowed behind eyes, eye in dorsal view 0.8 × as long as temple (Fig. 7C ); occipital carina narrow, non-lamelliform, smooth (Fig. 7C ); supra-antennal elevations smooth with outer side oblique, 0.4 × as long as scapus (Fig. 7C ); clypeus slightly concave and thick medio-ventrally (Fig. 7B ).

Mesosoma. Length of mesosoma 1.5 × as long as its height (Fig. 8D ); transverse mesopleural groove narrow, crenulate; mesopleuron above transverse mesopleural groove coarsely rugose anteriorly and smooth posteriorly, below groove largely punctated (Fig. 8D ); notauli wide, deep and coarsely crenulate; middle lobe of mesoscutum smooth arterially, otherwise transversely punctate-rugose, lateral lobes largely punctate-rugose (Fig. 8C ); scutel-lar sulcus complete, moderately narrow and crenulate; scutellum coarsely rugose and shallowly concave medially, anteriorly distinctly above level of mesoscutum; metanotum slightly convex, rugose (Fig. 8C ); propodeum punctate-rugose (Fig. 8C ); posterior propodeal carina distinctly arched, narrow lamelliform, foramen approximately 1.3 × as wide as high medially.

Wings. Fore wing: vein 1-M 1.4 × as long as vein 1-SR; second submarginal cell 1.3 × as long as third submarginal cell (Fig. 8A ).

Metasoma. First tergite 0.4 × as long as its apical width, smooth and with shallow but wide depression medially (Fig. 8E ); second tergite largely smooth and finely punctate laterally; following tergites moderately punctate (Fig. 8E ); first sternite sparse punctate and concave laterally; second sternite slightly convex, densely and finely punctate; lateral sides from third to fith sternites and anterior of fourth sternite without punctation, otherwise moderately punctate (Fig. 8F ).

Colour. Black; antenna largely brownish (except apex and scapus) (Fig. 7A ); outer orbita with pale yellow stripes, inner orbita with brownish short strips, malar space yellow brown patches; lateral corner of clypeus brownish; mandibles brown to dark brown, with basal pale patches (Figs 7B , 8B ); pair of ivory triangular patches on middle lobe of mesoscutum anterior-laterally, pair of ivory to brownish patches on antero-lateral margin of scutellum, metanotum white with brownish patches (Fig. 8C ); palpi brown (Fig. 8B ), tegulae dark brown (Fig. 8D ); about posteriorly half of first tergite ivory; margin of other tergites with ivory to brownish stripes (Fig. 8E ); fifth tergite with two elongated ivory patches media-posteriorly (Fig. 8E ); first sternite dark brown posteriorly (Fig. 8F ); coxa and trochanter of hind leg mainly white; tarsi and tibia of fore leg mainly yellow to brownish (Fig. 7A ); pterostigma dark brown; apical half of marginal cell of fore wing largely infuscate as area below it, remainder of wing membrane subhyaline (Figs 7A , 8A ).

Male. Unknown.

Etymology.

The specific epithet originates from " albus " (Latin for “white”) and " dorsalis " (Latin for “dorsal”) with reference to the white dorsal part of the pronotum.

Material examined.

Holotype China: ♀; Yunnan, Mt. Gaoligong, Dulong River, Qinlangdang Management and Protection Station , 1181 m, 27°41'6.73"N, 98°16'25.64"E; 15.V-15.VI.2020, Lang Yi leg., MT, SYS-BM En-419023 (deposited in SYSBM); GenBank: OM057972 .

Distribution.

China (Yunnan). Collected at 1181 m.

Comments.

This species is close to T. eurysoma and it would run to that taxon (couplet 17) in the revised key of Tan et al. (2017), but can be distinguished by having largely brownish antenna, dorsally white pronotum, pale and more elongate fore tibia, less sculptured vertex, and second sternite without ivory stripe. Part of key to Chinese species of the genus Taeniogonalos Schulz was revised to include T. eurysoma Chen & van Achterberg, 2020.

17	Second metasomal sternite of female less convex medially and in lateral view its ventral border gradually sloping posteriorly, strongly shiny medially and third sternite smooth anteriorly or nearly so; second sternite of male evenly slightly convex medio-posteriorly; vertex often strongly shiny	18
-	Second sternite of female strongly convex medially and in lateral view its ventral border distinctly sloping posteriorly, moderately shiny medially and third sternite distinctly punctate anteriorly; second sternite of male slightly flattened medio-posteriorly; vertex moderately shiny	20
18	Propodeum comparatively narrow, almost triangular in dorsal view (especially male, less so in female) and with nearly straight lateral margins; outer orbita black; supra-antennal elevations about half as long as scapus	T. alticola (Tsuneki, 1991)
-	Propodeum somewhat wider, more oval in dorsal view and lateral margins curved; outer orbita with pale stripes; supra-antennal elevations smaller (about 0.2 times as long as scapus)	19
19	Antenna mainly blackish; pronotum dorsally black; fore tibia comparatively dark and short; metasomal segments rather wide; second sternite with ivory stripe	T. eurysoma Chen & van Achterberg, 2020
-	Antenna largely brownish (Fig. 7A ); pronotum dorsally white (Fig. 8C ); fore tibia comparatively pale and more elongate (Fig. 7A ); vertex less sculptured (Fig. 7C ); metasomal segments comparatively elongate (Fig. 8E ); second sternite without ivory stripe	T. albidorsalis Zhang & Chen, sp. nov.
20	Vertex with elongate brownish patches; third and fourth metasomal tergites very coarsely punctate; metanotum with a pair of yellow spots medially; third sternite coarsely and densely punctate medio-posteriorly (male) or latero-posteriorly (female) in front of membranous border; [propodeal foramen comparatively wide and less arched].	T. formosana (Bischoff, 1913)
-	Vertex entirely black or rarely with small brownish patches; third and fourth metasomal tergites usually superficially punctate, rarely nearly as coarse as in T. formosana ; metanotum black medially and at most with a pair of lateral yellow spots; third sternite usually more spaced and finer punctate posteriorly	T. taihorina (Bischoff, 1914)

Figures

Figure 7. Taeniogonalos albidorsalis Zhang & Chen, sp. nov., holotype, female (En- 419023) A habitus, lateral aspect B head, anterior aspect C head, dorsal aspect.

Figure 8. Taeniogonalos albidorsalis Zhang & Chen, sp. nov., holotype, female (En- 419023) A wings B head, lateral aspect C mesosoma, dorsal aspect D mesosoma, lateral aspect E metasoma, dorsal aspect F metasoma, ventral aspect.