Yezoceryx tamdaoensis, 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 : 365-366

Yezoceryx tamdaoensis sp. nov.

( Figure 15 )

Diagnosis. Clypeus very short, about 0.25× as high as wide and deeply impressed basally; first tergite about 2.3× as long as its posterior width; first sternite with blunt tubercle, ovipositor about 2.7× as long as hind tibia.

Material examined. Holotype: ♀ ( IEBR), Vinh Phuc, Tam Dao NP, 6.v.1998, 900– 1200 m a.s.l., R. Matsumoto leg. ; Paratypes: 2♀ 1♂ ( OMNH), 1♂ ( IEBR), same data as holotype.

Description of female holotype. Head. Antenna with 25 flagellomeres, first flagellomere 1.2× length of second; frons concave and polished medially, punctate laterally; face densely, punctate, 0.7× as high as wide, swollen medially; clypeus short, about 0.25× as high as wide, with small punctures, with median and lateral tubercles; malar space 0.9× as long as basal width of mandible; mandible without transverse striations proximally, lower tooth of mandible equal to upper tooth, inner margins of eyes divergent ventrally; diameter of lateral ocellus 0.7× ocellar-ocular distance; vertex smooth, with sparse, fine punctures; occipital carina evenly curved, ventrally meeting hypostomal carina about 0.7× basal mandible width from base of mandible.

Mesosoma. Epomia equal to mandible basal width; pronotum with transverse striations across median groove, upper posterior corner with small, fine punctures; mesoscutum as long as wide at anterior level of tegulae, polished, with dense, fine punctures, pubescent; convergence area of notauli with one longitudinal carina medially; scutoscutellar groove with five carinae; scutellum with small punctures, pubescent, lateral carina present anteriorly; postscutellum polished, impunctate; mesopleuron polished, with sparse punctures, epicnemial carina sharp, complete, posterior transverse carina of mesosternum present medially; metapleuron densely finely punctate, pubescent; propodeum matt, area basalis narrow apically, area externa and area dentipara defined, area petiolaris polished, impunctate, pleural parts of posterior transverse carina present; fore basitarsus 2.5× second tarsomere; mid basitarsus 2.4× second tarsomere; hind leg with femur 3.2× as long as wide, 0.8× length of tibia, tarsus 0.8× tibia length, basitarsus 2.7× second tarsomere, fifth tarsomere 2.4× longer than third. Fore wing length 6.1 mm, vein Rs&M opposite cu-a, vein 2 rs-m basad of 2 m-cu about 0.75× length of 2 rs-m, first abscissa of hind wing vein Cu 1 not defined.

Metasoma. Tergites with small punctures, pubescent; first tergite 2.3× as long as posterior width, with small, sparse punctures, lateral longitudinal carina present basally, not reaching to spiracle; second tergite 0.4× as long as first tergite and equal to third; first sternite with weak tubercle; ovipositor about 2.8× as long as hind tibia; hypopygium 2.5× as long as second tergite.

Colour. Black. Antenna black, except flagellomeres 8–15 white, scape and pedicel dull yellow; frons with inner orbits dull yellow; clypeus and mandible, except teeth apically, yellowish brown; tergite 2 onwards with narrow brown posterior margins, ovipositor light brown, ovipositor sheath, hypopygium and legs, except hind coxa, yellowish brown, fore wing with apical part infuscated, area below pterostigma somewhat light brown.

Male. Similar to female except antenna entirely brown, without median white band, face entirely yellowish brown, similar colour to clypeus and mandible.

Variation. One female paratype has fore wing vein 2 rs-m basad of 2 m-cu by about 0.6× length of 2 rs-m whereas the other three paratypes have fore wing vein 2 rs-m basad of 2 m-cu from 1.2 to 1.5× length of 2 rs-m; the two female paratypes have flagellomeres 9-14 white; and the paratype male deposited at OMNH has the area superomedia of the propodeum defined.

Comparison. The new species differs from its congeners by its very short clypeus.

Etymology. Named after the type locality, Tam Dao National Park, a very well-known place for studying insects in North Vietnam.

Distribution. Currently known only from Tam Dao NP, Vinh Phu Province, Vietnam ( Figure 19 ).

Figures

FIGURE 15. Yezoceryx tamdaoensis sp. nov.: a. lateral view; b. face; c. lateral view of first metasomal tergite; d. dorsal view of head, mesosoma and propodeum; e. hind wing.

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.