Symplecis hoangliensis Varga, 2025

Varga, Oleksandr, 2025, First records of the genera Gnathochorisis Förster, 1869 and Symplecis Förster, 1869 (Hymenoptera, Ichneumonidae, Orthocentrinae) from Vietnam, Zootaxa 5647 (6), pp. 571-583 : 577-578

Symplecis hoangliensis Varga , sp. nov.

urn:lsid:zoobank.org:act:5939EC5A-F7F0-4D12-B2FE-F562E7C5E039

( Fig. 4 )

Material examined. Holotype: ♀, VIETNAM: Tonkin , Hoang Lien N. R., 15 km W Sa Pa, ca. 1900 m, Malaise traps, 15–21.x.1999, leg. C. v.Achterberg, RMHN’99, RMNH.INS.1722324 ( RMNH) . Paratype: 1 ♀, same locality and date as for holotype ,, RMNH .INS.1722325 ( RMNH).

Diagnosis. Symplecis hoangliensis sp. nov. is characterized by the combination of the following characters: face and clypeus dark brown ( Fig. 4B ); antenna with 18 flagellomeres, first flagellomere 6.1–6.3 × as long as wide ( Fig. 4G ); pronotum orange ( Fig. 4D ); mesoscutum densely pubescent centrally and glabrous laterally ( Fig. 4C ); propodeum with area superomedia absent ( Fig. 4E ); fore wing with vein 3rs-m present; hind wing with nervellus not intercepted ( Fig. 4F ); first metasomal tergite 2.6 × as long as maximum width; second tergite longitudinally wrinkled, 1.3 × as long as apical width ( Fig. 4G ); ovipositor 0.4–0.5 × as long as first tarsomere of hind tarsus.

Symplecis hoangliensis sp. nov. is similar to S. nudus sp. nov. in having the area superomedia absent, but differs by the densely pubescent centrally mesoscutum (entirely glabrous in S. nudus sp. nov.) and slightly shorter second tergite of metasoma, which is 1.3 × as long as apical width (1.4–1.5 × in S. nudus sp. nov.).

Description. Female. ( Fig. 4 ). Body length approximately 3.9–4.0 mm. Fore wing 3.0– 3.1 mm.

Head ( Figs 4B–D ) smooth and sparsely pubescent. Antenna with 18 flagellomeres, first flagellomere 6.1–6.3 × as long as wide. Face about 0.9 × as long as wide, smooth and sparsely pubescent; eyes strongly convergent to clypeus, glabrous. Malar space 0.5 × the basal width of mandible; subocular sulcus absent. Clypeus 0.7 × as long as wide, weakly granulate. Mandible bidentate, not twisted, lower tooth shorter than upper tooth. Temples short and strongly narrowed behind eyes (dorsal view). Frons and vertex smooth; length of the ocellar-ocular distance 1.0 × maximum diameter of lateral ocellus; occipital carina complete.

Mesosoma ( Figs 4C–E ) smooth and densely pubescent. Propleuron densely pubescent. Pronotum smooth and glabrous; epomia present, but not reaching mesoscutum. Mesoscutum densely and evenly pubescent centrally, glabrous laterally; notauli deep anteriorly, with vertical carina. Scutellum smooth. Mesopleuron smooth, densely pubescent dorsally and ventrally; epicnemial carina present; sternaulus deep on anterior 0.4 of mesopleuron. Metapleuron shiny, with traces of granulation, and with longitudinal carina in lower third; pleural and submetapleural carinae present. Propodeum smooth, with traces of granulation, lateral longitudinal and apical transverse carinae present; apophyses present, but weak.

Legs relatively slender; hind femur 5.1–5.2 × as long as wide; third tarsomere of hind tarsus 1.3 × as long as fifth tarsomere; tarsal claws simple.

Wings ( Fig. 4F ). Fore wing with vein 2rs-m about 1.0 × the distance between 2rs-m and 2m-cu; vein 3rs-m present; vein 1cu-a weakly basad to M&Rs; hind wing with nervellus not intercepted, slightly inclivous; distal abscissa of Cu absent.

Metasoma ( Fig. 4H ) longitudinally wrinkled anteriorly and sparsely pubescent. First tergite 2.6–2.7 × as long as maximum width, longitudinally wrinkled laterally; latero-median carinae present, but weak. Second tergite 1.3 × as long as apical width, longitudinally wrinkled. The remaining tergites smooth. Ovipositor short, about 0.15 × as long as hind tibia and 0.4–0.5 × as long as first tarsomere of hind tarsus.

Colour. Head brown-black except mandible (except apices), scape and pedicel orange. Mesosoma black except propleuron, pronotum, tegula and subtegular ridge orange. Fore and mid legs orange except coxae, trochanters and trochantelli yellow; hind leg orange except femur and tibia partly and tarsus entirely brownish. Metasoma with tergites 1–2 black; the remaining tergites brown, except second tergite apically, third tergite narrowly basally and apically, and fourth apically yellow. Pterostigma and veins brown.

Male. Unknown.

Etymology. The specific epithet consists of two words ‘hoang’ and ‘lien’ referring to the type locality of the new species situated in the Hoang Lien Nature Reserve. Adjective.

Distribution. Vietnam.

Figures

FIGURE 4. Symplecis hoangliensis sp. nov., holotype female. A—lateral view of habitus; B—frontal view of face; C—dorsal view of head and mesoscutum; D—lateral view of head and mesosoma; E—dorsal view of propodeum; F—lateral view of wings; G—frontal view of flagellomeres 1–2; H—dorsal view of metasomal tergites 1–3. Scale bars: 0.5 mm (A) and 0.1 mm (B–H).