Dendrocerus bellus Wang, Chen & Miko, 2021

Wang, Xu, Chen, Huayan, Miko, Istvan, Huang, Yixin & Zhu, Chaodong, 2021, Notes on the genus Dendrocerus Ratzeburg (Hymenoptera, Megaspilidae) from China, with description of two new species, Journal of Hymenoptera Research 86, pp. 123-143 : 123

Dendrocerus bellus Wang, Chen & Miko sp. nov.

Figs 8 , 9 , 10

Diagnosis.

This new species belongs to the D. halidayi species group, and is close to D. caelebs but can be distinguished by its smaller body size (only 1.1-1.2 mm), unobvious notauli, body coloration, median notch of distodorsal margin of gonostipes triangle and spatulated-shaped harpe.

Material Examined.

Holotype China • male; Guangdong, Guangzhou, SYSU Bamboo Garden ; 10.I-18.IV.2020; H. Chen leg.; (SYSBM) Paratypes (15 males, 17 females) China • 7 males, 1 female ; Guangdong, Guangzhou, University Town 2nd Forest ; 20.I-17.II.2017; H. Chen leg.; (AHNU) • 1 male, 1 female ; Guangdong, Guangzhou, University Town , 22.VII.2018 - 20.I.2019, H. Chen leg.; (AHNU) • 1 female ; Guangdong, Dongguan, Mt. Daling , 10-20.IX.2019; L. Chen et al. leg.; (SYSBM) • 2 females ; Guangdong, Guangzhou, South China Botanical Garden , 7.II-16.III.2020, H. Huang et al. leg.; (IZCAS) • 1 male ; Guangdong, Huizhou, Mt. Gutian ; 30.XI-30.XII.2019, L. Chen et al. leg.; (IZCAS) • 1 female ; Same collection information as preceding; 20-30. IX.2019; L. Chen et al. leg.; (SYSBM) • 2 females ; Guangdong, Dongguan, Mt. Daling ; 30.X-30.XI.2019; L. Chen et al. leg.; (SYSBM) • 1 female ; Guangdong, Mt. Dinghu ; 30.XI-30.XII.2019; L. Chen et al. leg.; (IZCAS) • 4 males, 8 females ; Guangdong, Guangzhou , SYSU bamboo garden; 10.I-17.IV.2020; H. Chen leg.; (IZCAS) • 1 male ; Sichuan, Yaan City, Zhangjiashan Park ; 14.VII.2006; Z. Gao; (AHNU) • 1 male ; Yunnan, Menghai, Mt. Bulang , 1595 m; 28.V-28.VI.2019; SCAU 3049495 (AHNU) .

Description.

Male: Body length: 1.1-1.2 mm.

Coloration (Fig. 8 ): Cranium, mesosoma and metasoma dark brown; eyes brown; ocelli yellow. Scape yellow, pedicel and flagellum dark brown. Fore and mid coxa along with femur and tibia yellow; syntergum dark brown (Figs 8A, G ); pterostigma dark brown; costal vein and radial vein brown (Fig. 8F ); body pubescence white; marginal fringes of wings brown.

Head (Fig. 8C ): Head width, dorsal view: slightly wider than mesosoma (about 1.2 × wider than mesosoma). HH: EHf = 1.7-1.9. HH: HL = 1.1-1.2. HW: IOS = 1.7. HW: HH = 1.1-1.2. CSB: Mean: 330-360 μm. POL shorter than OOL and ocellar triangle with broad base. OOL: LOL = 1.6-1.7. OOL: POL = 1.0-1.1. Head shape transverse in dorsal view; concolorous below and above eye midlevel. Preoccipital lunula absent (Fig. 8B ). Facial pit absent. Intertorular carina curved; ocular suture prominent and foveolate; frons with sparse hairs; densely pubescent at gena (Fig. 8B ). Facial pit present. Preoccipital furrow present.

Antennae (Fig. 8C ): Scape nearly five times longer than wide; pedicel small and almost globular. Scape length vs. pedicel length: 6.0-7.0. Scape length vs. F1 length: 2.7-3.2. F1 length vs. pedicel length: 2.3-2.7. F1 length vs. F2 length: 0.9-1.0. Longest flagellomere: F9. Length of setae on flagellomere vs. flagellomere width: setae as long as or shorter than width of flagellomeres. Basal flagellar segments clearly asymmetrical, strongly serrate.

Mesosoma (Fig. 8B, D ): Pronotum (Prn) not elongate. Anterior mesoscutal width (AscW) vs. posterior mesoscutal width (PscW): AscW/PscW = 0.7-0.8. Mesosoma slightly narrow (1.4 × longer than wide) (Length/width/height = 407/350/440 μm); coriaceous in sculpture, densely pubescent. mesoscutum: (Length/width = 127/206 μm); mesoscutum 1.6X wider than long, with more or less straight anterior margin; anterior corners of mesoscutum sharply angled; mesoscutal humeral sulcus evident; notauli thin and unobvious. Median mesoscutal sulcus present and complete, terminating adjacent to the transscutal articulation (Fig. 8B ); scutellum 0.9 × longer than wide, narrowed at apex with densely setose lateral margin; lateral scutellar carina evident; scutellum convex and highly sculptured with numerous hairs; metanotum and propodeum carinated. Posterodorsal metapleural area trapezoid. Mesopleural sulcus present.

Wing (Fig. 8F ): Total wing length 0.9 mm. Hyaline. Pterostigma (Length/width = 180/90 μm) elliptical, 2.0 × longer than wide; distal edge of pterostigma truncated; Radius (130 μm), curved a little in the middle and slightly shorter (0.7 ×) than pterostigma; forewing tinted with light brown, densely pubescent and marginal fringes numerous; hind wing without venation. Dark area on fore wing present.

Metasoma (Fig. 8G ): Metasoma lighter than mesosoma. Mesosoma 1.6 × longer than wide (Length/width/height = 500/320/220 μm). Syntergum with crenulate collar, clearly with neck. Rest of metasoma smooth. Strong transverse gastral carinae present in basal portion of metasoma; gastrocoeli not evident; five terminal segments visible dorsally with numerous hairs.

Male genitalia (Fig. 9 ): Genitalia with short cupula. Harpe longer than gonostipes in lateral view, with numerous terminal long and slender setae; harpe shape spatulate and oriented medially. Lateral setae of harpe present, but sparse. Gonostipes longer than wide, fused dorsally; apical margin curved medially, spatulated-shaped. Volsella black, with sharped apically. Median notch of distodorsal margin of gonostipes triangle. Distal parossiculal projection pointed.

Females (Fig. 10 ): Body length: 1.35-1.44 mm. Head yellow below and brown above eye midlevel, mandibles and palps yellow. Mesosoma and metasoma yellowish, tinged with brown; eyes white; ocelli white to yellowish. Scape, pedicel and basal flagellar segments yellowish. Legs yellowish; syntergum light brown (Figs 10A, G ). Metasoma darker than mesosoma. Flagellar segments symmetrical and cylindrical. Other characteristics similar to male.

Distribution.

China (Guangdong, Hainan, Sichuan, Yunnan).

Etymology.

The species name is a Latin masculine adjective meaning "beautiful and exquisite", signifying the beautiful coloration, especially in female.

Figures

Figure 8. Dendrocerus bellus Wang, Chen and Miko sp. nov., male, holotype A dorsal habitus B head and mesosoma, dorsal view C lateral habitus D head and mesosoma, lateral view E head, anterior view F wings G metasoma, dorsal view.

Figure 9. Dendrocerus bellus Wang, Chen and Miko sp. nov., male, holotype, genitalia A dorsal view B ventral view.

Figure 10. Dendrocerus bellus Wang, Chen and Miko sp. nov., female, paratype A dorsal habitus B head and mesosoma, dorsal view C lateral habitus D head and mesosoma, lateral view E head, anterior view F wings G metasoma, dorsal view.