Longipectus hagiangensis, 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 : 238-241

Longipectus hagiangensis gen. et sp. nov.

urn:lsid:zoobank.org:act:

Figs 1–2

Diagnosis

Sternaulus distinct, reaching hind margin of mesopleuron; area superomedia weakly defined; ovipositor sheath 0.33–0.38 × as long as hind tibia.

Etymology

The specific name refers to its type locality, Ha Giang Province.

Type material

Holotype

VIETNAM • ♀; Ha Giang Province, Quan Ba district, Tung Vai commune; 23 ° 03ʹ18ʺ N, 104°50ʹ44ʺ E; 1340 m a.s.l.; 26 Mar.–14 Apr. 2024; N. T. Pham leg.; Malaise trap; IB.

Paratypes

VIETNAM • 1 ♀; Cao Bang Province, Phia Oac-Phia Den National Park ; 8–18 May 2013; T. H. Pham leg.; Malaise trap; IB . • 2 ♀♀; Ha Giang Province, Meo Vac district, Chi San ; 23 ° 09.53ʹ N, 105°25.023ʹ E; 1149 m a.s.l.; 1 Apr.–31 May 2024; N. T. Pham and N. T. Q. Cao leg; Malaise trap; IB .

Description

Female

HEAD. Face 1.0 × as wide as high, granulate, with setae. Clypeal suture indistinct. Clypeus 2.0 × as wide as high, polished, sparsely punctate, with setae, ventral margin weakly impressed. Mandible short and stout, 2.4 × as long as median width, weakly narrowed towards apex, teeth sharp, upper tooth longer than lower tooth. Malar space granulate, 0.7 × as wide as mandibular basal width ( Fig. 2A). Gena matt, with setae. Frons and vertex mat, with setae. Postero-ocellar distance 1.2 × ocular-ocellar distance, 0.8 × median ocellus diameter ( Fig. 2B). Antenna with 32 flagellomeres, F1 7.0 × as long as wide, 1.1 × as long as F2. Occipital carina complete, ventrally meeting hypostomal carina about 0.6 × basal mandibular width from base of mandible.

MESOSOMA. 0.7 × as long as metasoma ( Fig. 1). Pronotum 0.3 × as long as mesosoma, matt dorsally, posterior corner punctostriate, with setae, medially strongly impressed, subpolished, with striations. Epomia absent ( Fig. 2E). Mesoscutum 1.4 × as long as its maximum width, granulate. Notauli present on anterior 0.5 of mesoscutum. Scutellum moderately weakly convex, finely granulate, except impunctate posteriorly, lateral carina present basally ( Fig. 2D). Mesopleuron matt, punctate, with setae; epicnemial carina distinct on ventral 0.7 of mesopleuron. Sternaulus distinct, reaching hind margin of mesopleuron, distinctly dorsal of lower posterior. Metapleuron matt. Juxtacoxal carina complete ( Fig. 2E). Propodeum gradually sloping in lateral view, matt, except area petiolaris smooth. Area superomedia weakly defined, separated from area petiolaris ( Fig. 2H). Spiracle small, round.

WINGS. Fore wing length ca 3.6 mm, vein 1cu-a postfurcal to M&RS, curved, vein 3rs-m absent, vein 2rs-m slightly longer than 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 1.3 × length of cu-a.

LEGS. Hind coxa matt. Hind femur 5.6 × 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 and T2 subpolished, with longitudinal wrinkles, T3 matt, with longitudinal wrinkles on anterior 0.75, T4 onwards finely punctate. T1 2.5 × as long as posterior width, ventrolateral carina distinct; spiracle small, round. T2 1.5 × as long as T1, 2.9 × as long as anterior width, 1.5 × as long as posterior width ( Fig. 2F). Ovipositor thin, straight, lower valve with teeth apically ( Fig. 2K); ovipositor sheath 0.33 × as long as hind tibia.

COLOUR. Black with reddish brown markings. Head black, scape ventrally and mandible reddish brown, palpi yellow. T2–T5 reddish brown apically, T6 onward reddish brown. Fore and mid legs reddish brown, except coxae, trochanters, trochantelli yellow. Hind leg largely black except trochanter and trochantellus yellow. Wings hyaline, wing veins brown.

Variation

Paratypes with malar space from 0.6–0.8 × as long as mandibular basal width, mandible 2.0–2.5 × as long as median width, hind femur varies from 5.3–5.6 × as long as wide, 0.85–0.9 × as long as hind tibia, T1 2.3–2.5 × as long as posterior width, T2 2.7–2.8 × anterior width, 1.4 × posterior width, ovipositor sheath 0.35–0.38 × hind tibia length. Paratype collected from Cao Bang Province has postero-ocellar distance 1.3 × ocular - ocellar distance, 1.0 × median ocellus diameter, fore wing 3.8 mm long, length of hind wing vein CU between M and cu-a 0.9 × length of cu-a.

Male

Unknown.

Distribution

Currently known only from evergreen montane forests in Ha Giang and Cao Bang provinces, northeastern Vietnam.