Longipectus yagi, Pham & Cao, 2025

Pham, Nhi Thi & Cao, Nga Thi Quynh, 2025, A new genus and three new species of the subfamily Phygadeuontinae (Hymenoptera: Ichneumonidae) from northern Vietnam, European Journal of Taxonomy 1026, pp. 236-249 : 245-248

Longipectus yagi gen. et sp. nov.

urn:lsid:zoobank.org:act:

Figs 6–7

Diagnosis

Sternaulus indistinct; area superomedia absent; posterior transverse carinae forming a crest; fore wing smoky medially; ovipositor sheath 0.29 × as long as hind tibia.

Etymology

The species is named to commemorate all the victims of the typhoon Yagi which struck northern Vietnam in early September 2024.

Type material

Holotype

VIETNAM • ♀; Ha Giang Province, Meo Vac district, Chi San ; 23 ° 09.53ʹ N, 105°25.023ʹ E; 1149 m a.s.l.; 1 Aug.–15 Sep. 2024; N. T. Pham and N. T. Q. Cao leg.; Malaise trap; IB.

Description

Female

HEAD. Face 0.9 × as wide as high, punctulate, with setae. Clypeal suture indistinct. Clypeus convex, 2.0 × as wide as high, polished, sparsely punctate, with setae, ventral margin weakly impressed. Mandible short, 2.1 × as long as median width, distinctly narrowed towards apex, teeth sharp, upper tooth slightly longer than lower tooth. Malar space punctulate, 0.6 × as wide as mandibular basal width ( Fig. 7A). Gena subpolished, finely punctate, with setae. Frons and vertex similarly sculptured as gena. Postero-ocellar distance 0.5 × ocular-ocellar distance, 0.5 × median ocellus diameter ( Fig. 7B). Antenna with 34 flagellomeres, F1 11 × as long as wide, 1.1 × as long as F2. Occipital carina complete, sinuously dorsally, ventrally meeting hypostomal carina about 1.0 × basal mandibular width from base of mandible.

MESOSOMA. 0.8 × as long as metasoma ( Fig. 6). Pronotum 0.4 × as long as mesosoma, with striations dorsally, posterior corner finely punctate, with setae, medially strongly impressed, polished, impunctate. Epomia absent ( Fig. 7E). Mesoscutum 1.9 × as long as its maximum width, matt, punctulate, medially with transverse wrinkles. Notauli present on anterior 0.6 of mesoscutum. Scutellum moderately convex, polished, impunctate except finely granulate anteriorly, lateral carina present basally ( Fig. 7D). Mesopleuron subpolished, finely punctate, with setae; epicnemial carina indistinct on ventral 0.5 of mesopleuron, dorsal 0.5 strong, curved, extending to upper margin of mesopleuron. Sternaulus indistinct. Metapleuron matt, densely punctate, with setae. Juxtacoxal carina absent ( Fig. 7E). Propodeum gradually sloping in lateral view, with dense transverse striations, area superomedia absent, posterior transverse carinae forming a crest, narrow area in front of crest and area petiolaris smooth, impunctate ( Fig. 7H). Spiracle small, round.

WINGS. Fore wing length ca 5.1 mm, vein 1cu-a antefurcal to M&RS, slightly curved, vein 3rs-m absent, vein 2rs-m 1.3 × as long as length of M between 2rs-m and 2m-cu, length of CU between 1m-cu&M and 2cu-a 1.1 × length of 2cu-a. Hind wing with distal abscissa of CU present, length of CU between M and cu-a 1.2 × length of cu-a.

LEGS. Hind coxa long, matt, punctulate. Hind femur 7.8 × as long as its maximum width, 0.8 × as long as hind tibia length. Hind tarsus 1.2 × hind tibia. Hind basitarsus 0.48 × as long as tarsus.

METASOMA. T1 polished, with weak longitudinal wrinkles, 2.5 × as long as posterior width, ventrolateral carina distinct; spiracle small, round. T2 subpolished, with dense longitudinal wrinkles, 2.6 × as long as T1, 5 × as long as anterior width, 2.4 × as long as posterior width. T3–T4 matt, densely punctate, with setae. T5 subpolished, with fine punctures. T6 onward polished, with minute punctures ( Fig. 7H). Ovipositor thin, straight, lower valve with teeth apically ( Fig. 7K); ovipositor sheath 0.29 × as long as hind tibia.

COLOUR. Black with yellow markings. Head black, mandible (except apex) reddish, palpi, scape, pedicel and basal half of F1 yellow, fore leg reddish brown except coxa, trochanter, trochantellus yellow, mid leg black except coxa, trochanter, trochantellus yellow, hind leg black except trochanter, trochantellus and basitarsus yellow. Wings hyaline, median part of fore wing smoky, veins black. Metasomal tergites black, posterior parts of T1–T2 reddish.

Male

Unknown.

Distribution

Currently known only from evergreen montane forest in Ha Giang Province, northeastern Vietnam.