Jezonogonalos eburnalva 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

Jezonogonalos eburnalva Zhang & Chen sp. nov.

Figs 2 , 3

Diagnosis.

Occipital carina weakly lamelliform dorsally (Fig. 2C ); supra-antennal elevations about 0.2 times as long as scapus and largely ivory dorsally (Fig. 2C ); frons densely punctate (Fig. 2C ); mandible mainly black, except dark brown base of teeth (Fig. 2B ); mesoscutum and propodeum distinctly sculptured; metasoma robust, smooth and largely black except the posterior half of first tergite ivory (Fig. 2A ); first tergite approximately as long as its apical width (Fig. 3F ); third sternite approximately 0.5 × as long as second sternite (Fig. 3H ).

Description.

Male. Holotype, length of body 6.2 mm (of fore wing 5.1 mm).

Colour. Black; lower half of inner orbita narrowly ivory and connected to ivory malar space (Fig. 2B ); apex of supra-antennal elevation ivory (Fig. 2B ); lateral corner of clypeus ivory and connected to ivory malar space; mandibular teeth, palpi dark brown (Fig. 2B ); tegulae dark brown; legs mainly black, but tibia and tarsus of fore leg rather brownish (Fig. 2A ); apical half of first tergite ivory in dorsal view, nearly all of first tergite ivory in lateral view (Figs 3F, G ) and apico-lateral margin of first sternite ivory (Fig. 3H ); posterior margin of all other tergites and sternites light ivory (Fig. 3H ); pterostigma and posterior half of first submarginal cell to anterior third of marginal cell of fore wing and area below it dark brown to light brown, remainder of wing membrane subhyaline (Fig. 3B ).

Head. Antenna with 24 segments (Fig. 2A ); tyloids nearly circular on 10th, 15th and 16th segments, oval on 11th-14th segments, 0.1 times as long as segment on 10th, 16th segments and 0.3 times as long as segments on 11th-15th segments (Fig. 3A ); frons densely punctate; vertex and temple largely smooth and shiny with sparse and fine punctures; head gradually narrowed behind eyes, eye in dorsal view approximately as long as temple (Fig. 2C ); occipital carina narrow lamelliform medio-dorsally and without crenulae; supra-antennal elevations enlarged (about 0.2 × as long as scapus), outer side subvertical and largely smooth except for sparse punctures (Fig. 2C ); clypeus slightly concave and thick medio-ventrally.

Mesosoma. Length of mesosoma 1.8 × as long as its height (Fig. 3E ); mesopleuron smooth anteriorly and transversely reticulate-rugose posteriorly, transverse mesopleural groove moderately wide and shallow (Fig. 3E ); notauli wide, deep and coarsely crenulate; middle lobe of mesoscutum transversely rugose, lateral lobes of mesoscutum mainly finely rugose with a shallow furrow medially (Fig. 3D ); scutellar sulcus wide and coarsely crenulate; scutellum shiny, largely smooth with irregular longitudinal rugae, slightly convex medially and anteriorly near level of mesoscutum (Fig. 3E ); metanotum medially protruding and obtuse, shiny and largely smooth with sparse fine rugae (Fig. 3D ); propodeum reticulate-rugose antero-medially, obliquely rugulose antero-laterally, distinct transversely striate medially, with several longitudinal striae and sparse irregular rugae between large smooth space posteriorly (Fig. 3D ); posterior propodeal carina thick lamelliform (foramen approximately1.4 × as wide as high medially).

Wings. Fore wing: length of vein 1-M 1.6 × as long as vein 1-SR; second submarginal cell 3.1 × as long as third submarginal cell (Fig. 3B ).

Metasoma. First tergite approximately as long as its apical width, smooth and with distinct elliptical depression antero-medially, apical half with fine dense longitudinal rugae; second and following tergites shiny and smooth except for sparse superficial punctures (Fig. 3F ); sternites rather sparsely finely punctate; second sternite rather flat; third sternite approximately 0.5 × as long as second sternite (Fig. 3H ); genitalia extruded (Fig. 3G ).

Female. Unknown.

Etymology.

Name derived from " eburnus " (Latin for “ivory”) and " alvus " (Latin for “belly”) because of the large ivory area of the first tergite.

Material examined.

Holotype, male, China: Yunnan, Mt. Gaoligong, Dulong River, Caihong Bridge , 1496 m, 27°53'51.96"N, 98°20'11.89"E, 2-16.V.2020, Yi Lang leg., MT, SYS-BM En-419020 (deposited in SYSBM); GenBank: OM057963 .

Distribution.

China (Yunnan). Collected at 1496 m.

Comments.

This species is similar to J. jiangliae but has a relatively short third sternite, more robust first tergite and apical half of tergite ivory, and occipital carina narrow or J. laeviceps (shares similar first tergite and second tergite), but it has the mesoscutum and propodeum distinctly sculptured, mandibles dark and occipital carina narrower. The key to species of Jezonogonalos published by Tan et al. (2017) could be updated to accommodate J. eburnalva by replacing couplet 1 as follows:

1"	First metasomal tergite about as long as its apical width; supra-antennal eleva-tions only apically ivory	1 '
-	First metasomal tergite 0.6-0.8 times as long as its apical width; at least apical half of supra-antennal elevations yellow or ivory or entirely black	1
1'	Metasoma of ♂ robust and first tergite with large ivory patch (Figs 3F, G ); occipital carina narrow lamelliform medio-dorsally and without crenulae (Fig. 2C ); third submarginal cell of fore wing about 0.3 times as long as second submarginal cell (Fig. 3B )	J. eburnalva Zhang & Chen, sp. nov.
-	Metasoma of ♂ slender and entirely black; occipital carina widened and extensively crenulated dorsally; third submarginal cell of fore wing about 0.4 times as long as second submarginal cell	J. jiangliae Chen, van Achterberg, He & Xu, 2014

Figures

Figure 2. Jezonogonalos eburnalva Zhang & Chen, sp. nov., holotype, male (En- 419020) A habitus, lateral aspect B head, anterior aspect C head, dorsal aspect.

Figure 3. Jezonogonalos eburnalva Zhang & Chen, sp. nov., holotype, male (En- 419020) A tyloids on 10 th- 16 th segments of antenna B wings C head, lateral aspect D mesosoma, dorsal aspect E mesosoma, lateral aspect F metasoma, dorsal aspect G metasoma, lateral aspect H metasoma, ventral aspect.