Yezoceryx phui, 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 : 359-360

Yezoceryx phui sp. nov.

( Figure 10 )

Diagnosis. Black body with yellow face; head and mesosoma with dense whitish setae; occipital carina deeply concave dorsally; first tergite 1.8× as long as posterior width; first sternite with weak anteriorly projecting hook.

Material examined. Holotype: ♂ ( IEBR), Hoa Binh Province, Ngoc Son-Ngo Luong NR, 17–22.ix.2016, Malaise trap, P.V. Pham leg.

Description of male holotype. Head. Antenna with 35 flagellomeres, first flagellomere 1.6× length of second; frons concave and transversely striate medially, laterally punctate; face densely, strongly granulate, 0.6× as high as wide, swollen medially; clypeus about 0.6× as high as wide, with deep, large punctures, subapical margin with small tubercle medially; malar space 1.1× as long as basal width of mandible; mandible with deep and large punctures, lower tooth of mandible distinctly longer than upper tooth, inner margins of eyes divergent ventrally; diameter of lateral ocellus 0.65× ocellar-ocular distance; vertex matt, coarsely punctate; occipital carina deeply concave dorsally, ventrally meeting hypostomal carina about 0.9× basal mandible width from base of mandible.

Mesosoma. Epomia 1.5× as long as mandible basal width; pronotum densely striate, upper posterior corner densely punctate; mesoscutum nearly as long as wide at anterior level of tegulae, matt, with dense, deep punctures, pubescent, convergence area of notauli with two sinuous longitudinal carinae medially; scuto-scutellar groove with one strong median carina and two weak lateral carinae; scutellum with large punctures, pubescent, lateral carina extending to middle; postscutellum polished, impunctate; mesopleuron polished and impunctate medially, with deep, large punctures dorsally and ventrally, epicnemial carina sharp, complete, posterior transverse carina of mesosternum present medially; metapleuron densely wrinkled; propodeum matt, carinae strong, area basalis wider than high, area externa and area dentipara defined, area petiolaris polished, impunctate, pleural parts of posterior transverse carina present; fore basitarsus 2.8× second tarsomere; mid basitarsus 3.2× second tarsomere; hind leg with femur 3.1× as long as wide, 0.75× length of tibia, tarsus 0.8× tibia length, basitarsus 2.7× second tarsomere, fifth tarsomere 2.7× longer than third. Fore wing length 10 mm, vein Rs&M distad of cu-a, vein 2 rs-m slightly basad of 2 m-cu, first abscissa of hind wing vein Cu 1 1.2x as long as cu-a.

Metasoma. Tergites polished, with small punctures, pubescent; first tergite 1.8× as long as posterior width, with sparse punctures, lateral longitudinal carina present anteriorly, not extending to spiracle; second tergite 0.45× as long as first tergite and 1.2× as long as than third; first sternite with weak anteriorly projecting hook.

Colour. Black with white setae. Face, anterior side of fore and mid legs and narrow posterior margins of tergite 3 onwards whitish.

Female. Unknown.

Comparison. This new species differs from its congeners by the combination of a black body covered with whitish setae and the deeply concave occipital carina dorsally.

Etymology. The new species is named after Master student Phu Van Pham, an entomologist at IEBR who collected the holotype.

Distribution. Currently known only from Ngoc Son-Ngo Luong NR, Hoa Binh Province, North Vietnam ( Figure 19 ).

Figures

FIGURE 10. Yezoceryx phui sp. nov.: a. dorsal view; b. face; c. lateral view of head and mesosoma; d. dorsal view of head and mesoscutum; e. dorsal view of propodeum.

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.