Yezoceryx shengi, Achterberg, 2017

Achterberg, Cornelis Van, 2017, First record of the genus Yezoceryx Uchida (Ichneumonidae: Acaenitinae) from Vietnam, with descriptions of nine new species, Zootaxa 4311 (3), pp. 345-372 : 363-365

Yezoceryx shengi sp. nov.

( Figure 14 )

Diagnosis. Yellow with black markings; mesoscutum with rhombic black mark on median lobe; clypeus with dense striations at apical margin; face with transverse striations ventrally; first tergite 1.7× as long as its apical width; first sternite with anteriorly projecting hook; ovipositor about 2.9× as long as hind tibia;.

Material examined. Holotype: ♀ ( RMNH), Dak Lak, Chu Yang Sin NP, Krong K’Mar , 2–10.vi.2007, 740– 900 m, Malaise trap, C. v. Achterberg & R. de Vries leg.

Description of the female holotype. Head. Antenna with 24 flagellomeres, first flagellomere 1.3× length of second; frons concave and subpolished medially, punctate laterally; face densely, coarsely punctate laterally, strongly wrinkled medially, 0.6× as high as wide, elevated dorsally; clypeus about 0.4× as high as wide, densely, coarsely punctate, with dense transverse striations from apical margin extending to face ventrally, with median and lateral tubercles; malar space equal to basal width of mandible; mandible proximally and malar space with transverse striations, lower tooth of mandible distinctly longer than upper, inner margins of eyes divergent ventrally; diameter of lateral ocellus 0.6× ocellar-ocular distance; vertex with sparse, moderate-sized punctures; occipital carina evenly curved, ventrally meeting hypostomal carina about 0.7× basal mandible width from base of mandible.

Mesosoma. Epomia slightly shorter than mandible basal width; pronotum with dense, small punctures, pubescent, median groove with some weak striations near epomia and ventrally; mesoscutum 0.9× as long as wide at anterior level of tegulae, with dense punctures, pubescent; scutellum convex, densely punctate, pubescent, lateral carina present anteriorly; postscutellum polished, impunctate; mesopleuron moderately densely punctate, pubescent except for smooth concave area medially, epicnemial carina sharp, complete, posterior transverse carina of mesosternum present medially; metapleuron sparsely finely punctate, pubescent; propodeum punctate basally, with transverse striations at level of area superomedia, area basalis wider than long, area dentipara not defined, pleural parts of anterior and posterior transverse carinae present; fore basitarsus 2.6× second tarsomere; mid basitarsus 2.8× second tarsomere; hind leg with femur 2.9× as long as wide, 0.7× length of tibia, tarsus 0.7× tibia length, basitarsus 2.7× second tarsomere, fifth tarsomere 2.4× longer than third. Fore wing length 7.7 mm, vein Rs&M slightly distad of cu-a, vein 2 rs-m equal to distance between 2 rs-m and 2 m-cu, hind wing with first abscissa of vein Cu 1 0.8× length of vein cu-a.

Metasoma. Tergites with small punctures, pubescent; first tergite 1.7× as long as posterior width, with punctures mostly laterally, lateral longitudinal carina weakly extending to spiracle; second tergite 0.5× as long as first tergite, slightly longer than third; first sternite with anteriorly projecting hook, posterior end of sclerotized section of sternite level with base of hook; ovipositor 2.9× as long as hind tibia; hypopygium 2.9× as long as second tergite.

Colour. Light yellow. Antenna black, except scape, pedicel and first two flagellomeres yellow ventrally; frons with two black spots at concave, impunctate area, vertex with a black band extending from eyes to ocelli, occipital area reddish; mesoscutum with two reddish brown stripes on lateral lobes and a rhombic blackish stripe medially, connecting to black scuto-scutellar groove, apex of scutellum and postscutellum black, mesopleuron narrowly black along anterior margin and with small blackish mark at posterior margin, propodeum black anteriorly, metasomal tergite 1 black medially and baso-laterally, tergites 2-3 with blackish transverse stripes along anterior margins, tergite 4 onwards with brown anterior transverse stripes, ovipositor sheath brown, black apically, fore wings with apical part infuscate, hind leg with black marks on coxa, trochantellus and femur, tibia and tarsus reddish.

Male. Unknown.

Comparison. In Wang (1993), the new species runs to Yezoceryx apicicarinus Wang. It differs from the latter by the colouration of the head dorsally, mesoscutum, mesopleuron and legs. In addition, the new species has a longer ovipositor (2.9× hind tibia) than Y. apicicarinus (2.2×).

Etymology. Named in honour of Prof. Mao-Ling Sheng of the General Station of Forest Pest Management, State Forestry Administration, Shenyang, Liaoning, China.

Distribution. Currently known only from Chu Yang Sin NP, Dak Lak Province, Central Highlands of Vietnam ( Figure 19 ).

Figures

FIGURE 14. Yezoceryx shengi sp. nov.: a. dorsal view; b. face; c. lateral view of mesosoma; d. dorsal view of propodeum; e. lateral view of first metasomal tergite; f. lateral view of hypopygium.

FIGURE 19. Map of sampling sites of Yezoceryx spp in Vietnam: 1. Cao Bang Province; 2. Bac Kan Province; 3. Vinh Phuc Province, 4. Son La Province; 5. Hoa Binh Province; 6. Ninh Binh Province; 7. Nghe An Province; 8. Thua Thien-Hue Province; 9. Kon Tum Province; 10. Dak Lak Province; 11. Dong Nai Province.