Yezoceryx brevius, 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 : 350-352

Yezoceryx brevius sp. nov.

( Figure 3 )

Diagnosis. Yellow with black vertex; propodeum with short transverse carinae delimiting a small area at anterior of area superomedia, posterior to area basalis; first tergite 1.9× as long as posterior width; first sternite with round swelling; ovipositor equal to length of hind tibia.

Material examined. Holotype: ♀ ( IEBR), Dak Lak Province, Ea So NR, 310 m a.s.l., 12 0 55.93’N 108 0 37.964’E, 27.vii.2008, Malaise trap, H.T. Ngo leg.

Description of female holotype. Head. Antenna with 28 flagellomeres, first flagellomere 1.1× length of second; frons concave and polished medially, laterally swollen and punctate, median carina forming high tubercle between antennal sockets; face densely, strongly granulate, 0.7× as high as wide, swollen medially with dense wrinkles; clypeus about 0.5× as high as wide, sculpture similar to face except smooth apically, subapical ridge with small tubercle medially; malar space 1.1× as long as basal width of mandible; mandible with longitudinal striations proximally, lower tooth of mandible slightly longer than upper tooth, inner margins of eyes divergent ventrally; diameter of lateral ocellus 0.7× ocellar-ocular distance; vertex matt with dense, coarse punctures; occipital carina evenly curved, ventrally meeting hypostomal carina about 0.5× basal mandible width from base of mandible.

Mesosoma. Epomia 0.8× as long as mandible basal width; pronotum with striations across median groove, upper posterior corner densely punctate; mesoscutum nearly as long as wide at anterior level of tegulae, polished, with fine punctures, pubescent, convergence area of notauli irregularly wrinkled; scuto-scutellar groove with one strong median carina and two lateral carinae; scutellum with fine punctures, pubescent, lateral carina extending to posterior apex; postscutellum polished, impunctate; mesopleuron with dense punctures dorsally and anteriorly, ventrally with fine punctures, epicnemial carina complete, sharp, posterior transverse carina of mesosternum present medially; metapleuron densely punctate, pubescent; propodeum with wrinkles, area basalis small, area externa and area dentipara defined plus small area below area basalis, area petiolaris polished, impunctate, pleural parts of anterior and posterior transverse carinae present; fore basitarsus 2.1× second tarsomere; mid basitarsus 2.3× second tarsomere; hind leg with femur 2.5× as long as wide, 0.75× length of tibia, basitarsus 2.2× second tarsomere. Fore wing length 7.1 mm, vein Rs&M distad of cu-a, vein 2 rs-m basad of 2 m-cu about 0.8× length of 2 rs-m, first abscissa of hind wing vein Cu 1 0.6× as long as cu-a.

Metasoma. Tergites relatively densely punctate, pubescent; first tergite 1.9× as long as posterior width, densely punctate except apically medially, lateral longitudinal carina extending to spiracle; second tergite 0.5× as long as first tergite and 1.2× as long as third; first sternite with a low tubercle; ovipositor as long as hind tibia, hypopygium 1.4× as long as second tergite.

Colour. Yellow with black vertex, metasomal tergite 4 apically and tergites 5–6 partly black.

Male. Unknown.

Comparison. With its broad tubercle between the antennal sockets, Yezoceryx brevis sp. nov. resembles Y. maculataexcels . It can be recognized from its congeners by the short ovipositor.

Etymology. Named after its short ovipositor.

Distribution. Currently known only from Ea So NR, Dak Lak Province, Central Highlands of Vietnam ( Figure 19 ).

Figures

FIGURE 3. Yezoceryx brevius sp. nov.: a. lateral view; b. dorsal view; c. face; 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.