Drepanoctonus chamagudao Liu & Zheng, 2021

Zheng, Xin-Fang, Reshchikov, Alexey & Liu, Jing-Xian, 2021, Two new species of Drepanoctonus Pfankuch, 1911 (Hymenoptera, Ichneumonidae) from the Oriental region, Journal of Hymenoptera Research 83, pp. 1-19 : 1

Drepanoctonus chamagudao Liu & Zheng sp. nov.

Figs 3 , 4

Materials examined.

Holotype, female. China: Yunnan Province, Yuxi City, Xinping County, Mt. Ailao , Cha Ma Gu Dao , 98°53'43.38"N, 28°18'56.4984"E, 2538 m, 8. Aug. 2018, Zheng Xin-Fang leg., DNA voucher, SCAU 3013943, GenBank number: MW528531 , (SCAU).

Descriptions.

Female. Fore wing length 7.5 mm, body length 8.0 mm (Fig. 3 ).

Head. Combined face and clypeus densely and strongly punctate, densely setose, 0.7 × as wide as high (Fig. 4A ). Clypeus with transverse wrinkles. Mandible bidentate, with lower tooth as long as the upper one. Inner eye orbit weakly curved above antennal sockets. Vertex strongly vertical behind posterior ocelli, with minute punctures, densely setose. POL:OD:OOL=2:1.2:1. Temple strongly narrowed behind eyes in dorsal view (Fig. 4F ), densely setose. Occipital carina complete and sharp. Antenna with 41 flagellomeres, first flagellomere 2.6 × as long as its posterior width, 1.4 × as long as the second, antenna weakly flattened from 9th flagellomere to apex.

Mesosoma. Pronotum strongly punctate and setose on upper half, more or less shiny and glabrous on lower half, with a row of short and transverse wrinkles along posterior margin. Epomia strong, reaching upper 0.8 of pronotum. Mesoscutum strongly punctate and setose (Fig. 4C ). Notaulus absent. Scutellum flattened, sparsely punctate, with lateral carinae present at base (Fig. 4C ). Mesopleuron (Fig. 4D ) strongly roundly convex, densely punctate, sternaulus weakly impressed; epicnemial carina with dorsal end distant from the front edge of mesopleuron, speculum very small and polished. Mesopleural suture weakly foveolate. Metapleuron sparsely punctate, lower part of metapleuron with several transverse wrinkles, juxtacoxal carina present, submetapleural carina complete. Propodeum short, dorsal lateral areas strongly punctate and setose, area superomedia polished and nearly impunctate, latero-median longitudinal carinae complete and parallel, dorsomedial section of posterior transverse carina absent (Fig. 4B ); lateral longitudinal carina strong and complete; pleural area rugose-punctate, with dense and long setae, pleural carina strong and complete. Spiracle elongate, 2.0 × as long as its median width, connected to pleural carina by a short carina.

Wings. Fore wing with 1cu-a distad of M&RS, separated from M&RS by 0.67 × its own length, 2m-cu almost opposite to 2rs-m, 3rs-m absent. Hind wing with Cu & cu-a interrupted above the middle, distal abscissa of Cu weakly pigmented.

Legs. Fore and mid claws with 1-2 pectinate teeth at base. Mid tibial spurs nearly equal in length. Hind femur 4.8 × as long as its maximum width, hind tibia 5.8 × as long as its maximum width, hind tibial spurs equal in length, 0.57 × as long as 1st segment of tarsus (Fig. 4G ). Ratio of segments of hind tarsus as follows: 36: 18:12:7:12.

Metasoma. T1 1.0 × as long as its apical width, punctate, latero-median longitudinal carinae strong, anterior base of T1 strongly oblique in lateral view, dorsolateral carina sharp and complete, spiracle located on anterior 0.3 of the tergite (Fig. 4E ). T2 weakly transverse, 0.9 × as long as its apical width, strongly punctate with a pair of latero-median longitudinal carinae reaching to posterior margin of tergite (Fig. 4E ). T3 strongly punctate, 0.78 × as long as apical width, with median longitudinal carina reaching to apical 0.8 of tergite (Fig. 4E ). T4 transverse, strongly punctate, centrally with a median longitudinal carina, both ends of the carina distant from the margins of tergite. T5 strongly punctate, punctures of central area close to each other. T6 shallowly punctate. T7 very short. Ovipositor short, 0.88 × as long as 1st segment of hind tarsus.

Colour. Head and mesosoma black, covered with whitish setae (Fig. 4A, F ). Antenna black, 9th segment to the apex ventrally blackish-brown (Fig. 3A, B ). Palpi blackish-brown. All coxae and trochanters black (Fig. 3B ), fore leg dark brown with anterior sides of femur and tibia light brown; mid leg blackish-brown, anterior side of femur and ventral side of tarsus brown; hind leg black, anterior side of femur reddish-brown (excluding basal 0.3 which is black), tibial spurs whitish, ventral side of tarsus slightly tinged with reddish brown. First tergite black, with two yellowish white spots on posterior lateral corners, second tergite with anterior 0.4 black and posterior 0.6 reddish brown, the remaining tergites reddish brown (Fig. 3A ). Wings hyaline, veins and pterostigma black (Fig. 3A ).

Male. Unknown.

Distribution.

China (Yunnan province).

Comments.

This species is similar to D. bicolor (Fig. 2 ), but it differs from the latter in the presence of median longitudinal carina on T3 and T4 (Fig. 4E ), the colouration of the second tergite which is black on anterior half and reddish brown on posterior half, the colouration of the first tergite which has yellow spots on its posterior lateral corners (Fig. 3B ).

It also very resembles Drepanoctonus auritus Chiu, 1962 (Fig. 5A, B ), but can be separated from the latter by the colour pattern of its metasoma (Fig. 4E ), T1 black with a pair of yellowish white spots on its posterior lateral corners, and the posterior half of T2 and following tergites reddish, hind femora with anterior sides reddish-brown (Fig. 4E ).

Etymology.

The species is named after the type locality, Chamagudao, which means the Ancient Tea Horse Road of Yunnan province.

Figures

Figure 2. Drepanoctonus bicolor Kusigemati, 1971, female A habitus, lateral view.

Figure 3. Drepanoctonus chamagudao Liu & Zheng, sp. nov., female, holotype A habitus, dorsal view B habitus, lateral view.

Figure 4. Drepanoctonus chamagudao Liu & Zheng, sp. nov., female, holotype A face B propodeum, dorsally C mesonotum D mesopleuron E T 1 - T 3, dorsally F head, dorsally G hind leg, laterally.

Figure 5. Drepanoctonus auritus Chiu, 1962, female, holotype A habitus, dorsal view B habitus, lateral view.