Lycogaster umbonata Chen & van Achterberg, 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

publication ID	https://dx.doi.org/10.3897/jhr.90.80150
publication LSID	lsid:zoobank.org:pub:13EC4891-F124-4E77-BC22-F6978445DAE7
persistent identifier	https://treatment.plazi.org/id/1CA730CA-7C2D-4713-B62D-64BEF9397958
taxon LSID	lsid:zoobank.org:act:1CA730CA-7C2D-4713-B62D-64BEF9397958
treatment provided by	Journal of Hymenoptera Research by Pensoft
scientific name	Lycogaster umbonata Chen & van Achterberg
status	sp. nov.

Treatment

Lycogaster umbonata Chen & van Achterberg sp. nov.

Figs 4 View Figure 4 , 5 View Figure 5 , 6 View Figure 6

Diagnosis.

Antenna elongate and hardly widened medially (Figs 4A View Figure 4 , 6A View Figure 6 ); second sternite of female with a strong lobe-shaped protuberance medio-apically (Fig. 5E View Figure 5 ); mandibles with ivory patches (Figs 4B View Figure 4 , 6B View Figure 6 ); second tergite of female strongly shiny and with elliptical depressions antero-laterally (Fig. 5D View Figure 5 ); wing membrane subhyaline and without darkened (Figs 4A View Figure 4 , 5A View Figure 5 , 6A View Figure 6 ).

Description.

Female. Holotype, length of body 5.1 mm (of fore wing 4.1 mm).

Head. Antenna with 21 segments, elongate and hardly widened medially (Fig. 4A View Figure 4 ); frons spaced punctate and shiny, with distinct median depression (Fig. 4B View Figure 4 ); vertex and temple largely smooth and shiny with sparse and fine punctures (Figs 4B, C View Figure 4 ); head subparallel-sided behind eyes, distinctly narrowed posteriorly and 1.3 × as long as mesoscutum (Fig. 4C View Figure 4 ); dorsal length of eye approximately as long as temple (Fig. 4C View Figure 4 ); occipital carina narrow lamelliform and with weak crenulae medio-dorsally (Fig. 4C View Figure 4 ); supra-antennal elevations hardly developed as a thin rim and smooth, 0.3 × as long as scapus (Fig. 4C View Figure 4 ); clypeus emarginate and comparatively thin medio-ventrally (Fig. 4B View Figure 4 ).

Mesosoma. Length of mesosoma 1.8 × as its height (Fig. 5C View Figure 5 ); mesopleuron below transverse mesopleural groove rugose to punctate anteriorly, largely smooth and shiny posteriorly, above groove similar but rugose anteriorly (Fig. 5C View Figure 5 ); notauli narrow anteriorly, widened posteriorly and coarsely crenulate; middle lobe of mesoscutum sparsely and rather finely punctate anteriorly, coarsely punctate at posterior end, lateral lobes sparsely and rather finely punctate (Fig. 5B View Figure 5 ); scutellar sulcus wide, both medially and laterally and coarsely crenulate (Fig. 5B View Figure 5 ); scutellum largely smooth with sparsely and finely punctate, distinctly shiny, rather flat and anteriorly near level of mesoscutum; metascutellum shiny and smooth medio-posteriorly (Fig. 5B View Figure 5 ); propodeum largely obliquely rugulose to rugose with smooth interspaces anterio-laterally (Fig. 5B View Figure 5 ); posterior propodeal carina thick lamelliform and distinctly arched, foramen approximately 1.5 × as wide as high medially (Fig. 5B View Figure 5 ).

Wings. Fore wing: length of vein 1-M 1.8 × as long as vein 1-SR; second submarginal cell 1.4 × as long as third submarginal cell (Fig. 5A View Figure 5 ).

Metasoma. First tergite 0.5 × as long as its apical width, smooth, with rather distinct elliptical depression medially and basal half with several distinct coarse transverse rugae medially (Fig. 5D View Figure 5 ); second tergite with elliptical depressions antero-laterally; second-fifth tergites largely smooth with sparse fine punctures (Fig. 5D View Figure 5 ); sternites sparsely and finely punctate (Fig. 5F View Figure 5 ); second sternite strongly convex in lateral view, with a strong lobe-shaped protuberance medio-apically (Fig. 5E View Figure 5 ); third sternite about 0.2 × as long as second sternite, with distinct ledge (Fig. 5F View Figure 5 ); hypopygium truncate apically (Fig. 5F View Figure 5 ).

Colour. Black; mandibular teeth and palpi dark brown; anterior-basal part of mandible ivory (Fig. 4B View Figure 4 ); distal of fumer, tibia, tarsus and claw yellow to brownish (Fig. 4A View Figure 4 ); pterostigma dark brown; wing membrane subhyaline and without darkened (Fig. 4A View Figure 4 ).

Male. Paratype, length of body 5.9 mm, of fore wing 4.5 mm; antenna with 21 segments and without tyloids (Fig. 6A View Figure 6 ); vertex densely and coarsely punctate; sculpture of mesosoma coarser than that in female (Fig. 6B View Figure 6 ); second tergite with a round depression antero-medially; second-fifth tergites and sternites densely and rather fine punctate, except sparsely and coarsely punctate in big round area of third tergite medially (Figs 6C-E View Figure 6 ); genitalia extruded (Fig. 6D View Figure 6 ); ivory part of mandible larger than that of female; clypeus with ivory patches (Fig. 6B View Figure 6 ); large part of hind tibia, hind tarsus and hind claw brown (Fig. 6A View Figure 6 ), not like that in female.

Etymology.

Named after the strong lobe-shaped protuberance of female second sternite: from " umbo " (Latin for "rounded protuberance").

Material examined.

Holotype, female, China: Yunnan, Baoshan City, Longyang Dist. , 2390 m, 25°17'57.26"N, 98°46'11.35"E, 15-30.IX.2020, Lang Yi leg., MT, SYSBM En-419021 (deposited in SYSBM); GenBank: OM057968 View Materials GoogleMaps . Paratype, 1 male, China: Yunnan, Baoshan City, Longyang Dist. , 2390 m, 25°17'57.26"N, 98°46'11.35"E, 30.VII-15.VIII.2020, Lang Yi leg.,MT, SYSBM En-419022 (SYSBM); GenBank: OM057967 View Materials GoogleMaps .

Distribution.

China (Yunnan). Collected at 2390 m.

The key to Chinese species of Lycogaster published by Chen et al. (2014) could be updated to accommodate L. umbonata by replacing couplet 2 as follows:

2	Female antenna elongate and hardly widened medially (Fig. 4A View Figure 4 ); second tergite smooth and strongly shiny (Fig. 5D View Figure 5 ); medial third of fore wing subhyaline (Figs 4A View Figure 4 , 5A View Figure 5 , 6A View Figure 6 ) or slightly darkened	2 '
-	Female antenna less elongate and distinctly widened medially; second tergite punctate and moderately shiny; medial third of fore wing largely dark brown	3
2'	Medio-apical protuberance of second sternite with pair of small submedial acute teeth close to each other; posterior end of middle lobe of mesoscutum rugose	L. angustula Chen, van Achterberg, He & Xu
-	Medio-apical protuberance of second sternite obtuse, lamelliform and convex medio-apically, without small submedial acute teeth (Fig. 5E View Figure 5 ); posterior end of middle lobe of mesoscutum largely smooth with sparse fine punctures (Fig. 5B View Figure 5 )	L. umbonata Chen & van Achterberg, sp. nov.