Symplecis granulosus 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 : 575-576

Symplecis granulosus Varga , sp. nov.

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( Fig. 3 )

Material examined. Holotype: ♀, VIETNAM: Lam Dong, Bidoup Nuiba N.P., near Da Lat , 1650–1700 m, Malaise trap 1–12, 11–19.x.2005, leg. C. v. Achterberg & R. de Vries, RMHN’05, RMNH.INS.1722323 ( RMNH).

Diagnosis. Symplecis granulosus sp. nov. is characterized by the combination of the following characters: face dark brown, clypeus yellow ( Fig. 3B ); antenna with 18 flagellomeres, first flagellomere 4.3 × as long as wide ( Fig. 3G ); pronotum orange ( Fig. 3D ); mesoscutum evenly and densely pubescent ( Fig. 3C ); propodeum with area superomedia delimited by carinae, 1.6 × as long as wide, costulae present ( Fig. 3E ); fore wing with vein 3rs-m present; hind wing with nervellus not intercepted ( Fig. 3F ); first metasomal tergite 2.3 × as long as maximum width; second tergite granulate, 1.2 × as long as apical width ( Fig. 3H ); ovipositor 0.6 × as long as first tarsomere of hind tarsus.

Symplecis granulosus sp. nov. differs from the other Oriental species by the granulate tergites 2–3 (second tergite longitudinally wrinkled and third smooth in the other Vietnamese species). It is similar to S. vietnamensis sp. nov. and S. anaeratabettensis Ranjith, Humala & Priyadarsanan, 2022 in having the completely carinated propodeum, but differs from both species by the more elongate area superomedia, which is 1.6 × as long as wide (1.2–1.3 × in S. vietnamensis sp. nov. and 1.0 × in S. anaeratabettensis ) and brown-black face (yellow in S. vietnamensis sp. nov. and S. anaeratabettensis ).

Description. Female. Holotype ( Fig. 3 ). Body length approximately 2.9 mm. Fore wing 2.3 mm.

Head ( Figs 3B–D, G ) smooth and sparsely pubescent. Antenna with 18 flagellomeres, first flagellomere 4.3 × as long as wide. Face about 0.9 × as long as wide, smooth and sparsely pubescent; eyes strongly convergent to clypeus, glabrous. Malar space short, 0.2 × 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 weakly granulate; length of the ocellar-ocular distance 1.3 × maximum diameter of lateral ocellus; occipital carina complete.

Mesosoma ( Figs 3C–E ) granulate and densely pubescent. Propleuron densely pubescent. Pronotum smooth and glabrous; epomia present, but not reaching mesoscutum. Mesoscutum densely and evenly pubescent; notauli deep anteriorly, with vertical carina. Scutellum densely pubescent. Mesopleuron granulate, densely pubescent dorsally and ventrally; epicnemial carina present; sternaulus deep on anterior 0.3 of mesopleuron. Metapleuron granulate, with longitudinal carina in lower third; pleural and submetapleural carinae present. Propodeum granulate, carinated; area superomedia elongate, 1.6 × as long as wide, costulae present; apophyses absent.

Legs relatively slender; hind femur 5.1 × as long as wide; third tarsomere of hind tarsus 1.2 × as long as fifth tarsomere; tarsal claws simple.

Wings ( Fig. 3E ). Fore wing with vein 2rs-m about 0.6 × the distance between 2rs-m and 2m-cu; vein 3rs-m present, but partly unpigmented; vein 1cu-a opposite to M&Rs; hind wing with nervellus not intercepted, vertical; distal abscissa of Cu absent.

Metasoma ( Fig. 3H ) longitudinally wrinkled anteriorly and sparsely pubescent. First tergite 2.3 × as long as maximum width, granulate, rugulose laterally; latero-median carinae indistinct. Second tergite 1.2 × as long as apical width, granulate, indistinctly longitudinally wrinkled. Third tergite granulate on anterior 0.8. The remaining tergites smooth. Ovipositor short, about 0.2 × as long as hind tibia and 0.6 × as long as first tarsomere of hind tarsus.

Colour. Head brown-black except clypeus, mandible (except apices), scape and pedicel yellow. Mesosoma brown except propleuron, pronotum, tegula and subtegular ridge orange. Legs yellow except hind femur orange, tibia and tarsus brownish. Metasoma brown except second tergite apically yellow. Pterostigma and veins brown.

Male. Unknown.

Etymology. The specific epithet is from Latin ‘grânulôsus’ refers to the granulate body sculpture of this species, especially meso-, metapleuron, propodeum and metasoma. Adjective.

Distribution. Vietnam.

Figures

FIGURE 3. Symplecis granulosus 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).