Chartocerus menglaensis Chen & Zhao, 2025

Zhao, Hui-Feng, Geng, Hui, Chen, Hai-Feng & Chen, Ye, 2025, A new species and two new distributional records of Signiphoridae (Hymenoptera, Chalcidoidea) from the canopy of the Xishuangbanna Rainforest, ZooKeys 1264, pp. 51-60 : 51-60

Chartocerus menglaensis Chen & Zhao sp. nov.

Figs 1–9

Type material.

Holotype: China • ♀; Yunnan Province; Xishuangbanna; Mengla County; Menglun Town ; 21°53.92'N, 101°16.1'E; 560 m a. s. l.; 3 May. 2019; Z.-l. Bai, Z.-g. Chen, C. Wang, Yanfeng Tong, H. Yu leg.; LFNU Sc 20210701 [on slide] . Paratypes: • 1 ♀ Yunnan Province; Xishuangbanna; Mengla County; Menglun Town ; 21°53.59'N, 101°17.29'E; 606 m a. s. l.; 4 May. 2019; Z.-l. Bai, Z.-g. Chen, C. Wang, Yanfeng Tong, H. Yu leg.; LFNU Sc 20210702 [on slide] ; • 1 ♀ Yunnan Province; Xishuangbanna; Mengla County; Menglun Town ; 21°54.37'N, 101°16.71'E; 623 m a. s. l.; 6 May. 2019; Z.-l. Bai, Y.-j. Lin, C. Wang, Yanfeng Tong, H. Yu leg.; LFNU Sc 20210703 [on slide] .

Diagnosis.

Body black; fore wing (Fig. 6 ) mostly hyaline, narrowly infuscate posterior to submarginal vein. Clava 5.2–6.2 × as long as wide; fore wing 2.6–2.7 × as long as wide, with longest setae of marginal fringe 0.3 × as long as width of disc; Hind wing (Fig. 7 ) 3.3–3.6 × as long as wide, with posterior margin strongly rounded; Mt 1 with posterior margin almost straight medially.

Description.

Female. Body length 0.8–0.9 mm.

Colour (Fig. 1 ). Head and body bright black with bronze reflection; eyes dark red; antenna dark brown; legs mostly black, with tarsomeres yellowish brown except that 1–4 of mid leg and 1–2 of hind leg which are pale yellow; fore wing (Fig. 6 ) nearly hyaline, infuscate posterior to submarginal vein forming a narrowly transverse brown band, and infuscate along middle part of posterior margin; hind wing hyaline.

Head (Fig. 2 ). In frontal view, 0.8 × as high as wide, mostly smooth, with weakly lineolate sculpture on gena. Vertex two-thirds the width of head. Eye 0.6 × as high as head. Mandible with two teeth. Antenna (Fig. 3 ) with four anelli; scape 3.8–4.9 × as long as wide; pedicel 1.8–2.3 × as long as wide; clava 5.2–6.2 × as long as wide, 1.7–1.9 × as long as scape.

Mesosoma (Fig. 4 ). Pronotum, mesoscutum, and anterior of metanotum transversely imbricate; lateral sides of mesoscutellum and axillae reticulate. Mesoscutum 3.0 × as long as mesoscutellum, with 13 setae posteriorly and a pair of long setae near posterolateral corner. Mesoscutellum with 10 setae along posterior margin, the distance of scutellar sensilla 0.26 × the anterior width of mesoscutellum. Metanotum a little shorter than mesoscutellum. Mesopostphragma extending to posterior of Mt 4.

Wings. Fore wing (Fig. 6 ) 2.6–2.7 × as long as wide, with longest setae of marginal fringe 0.3 × as long as width of disc, seta M 1 absent. Hind wing (Fig. 7 ) 3.3–3.6 × as long as wide, bearing one seta posterior to the apex of marginal vein, posterior margin strongly rounded, with longest setae of marginal fringe 0.3 × wing width.

Legs (Fig. 8 ). Mid leg with basitarsus 0.5 × as long as tibia, and the basitarsus nearly as long as mesotibial spur; mesotibial spur with 6–8 teeth.

Metasoma. Mt 1 with posterior margin almost straight medially (Fig. 5 ). Ovipositor originating from apex of Mt 3, 2.3–2.6 × as long as mesotibia, 1.7–1.8 × as long as metatibia. Third valvula equal in length to mesobasitarsus.

Male. Unknown.

Host.

Unknown.

Etymology.

The specific name refers to the type locality.

Distribution.

Known only from Menglun town, Mengla county, Yunnan Province, China.

Comments.

This new species is similar to Chartocerus niger (Ashmead) ; the differences are provided in the key.

Figures

Figures 1–9. Chartocerus menglaensis sp. nov., ♀. 1. Body, lateral view; 2. Head, frontal view; 3. Antenna (inset shows anelli); 4. Mesosoma; 5. Propodeum and Mt 1; 6. Fore wing; 7. Hind wing; 8. Legs; 9. Metasoma. Scale bars: 100 μm (except Fig. 1).