Palpostilpnus trifolium, Reshchikov & Santos & Liu & Barthélémy, 2019

Reshchikov, Alexey, Santos, Bernardo F., Liu, Jing-Xian & Barthélémy, Christophe, 2019, Review of Palpostilpnus Aubert (Hymenoptera, Ichneumonidae, Phygadeuontinae), with the description of ten new species, European Journal of Taxonomy 582, pp. 1-63 : 37-40

Palpostilpnus trifolium sp. nov.

urn:lsid:zoobank.org:act:0B9DAD64-288F-4E1D-823D-0292A6CA9906

Figs 20–21

Diagnosis

Body obliquely elongate ( Fig. 20A ). Postero-ocellar distance 1.5 times ocular-ocellar distance ( Fig. 21G ). Occipital carina complete. Epomia distinct. Epicnemial carina short, defined only in ventral portion of mesopleuron. Propodeal carinae incomplete, except area postero-externa ( Fig. 21C ). T1 1.8 times as long as apically broad. Wings hyaline ( Fig. 21H ).

Etymology

The specific name is derived from the generic Latin name of clover, Trifolium L., in reference to the trilobed colour pattern on the scutum of this species.

Material examined

Holotype CHINA • ♀; Hong Kong , Pak Sha O ; 22°26.88′ N, 114°19.19′ E; 70 m a.s.l.; garden/orchard clearing; Malaise trap M018.C.Hy.10; 7–13 Jun. 2004; C. Barthélémy leg.; NHRS HT-HEVA000010861 .

Description

Female

SIZE. Fore wing length 4.2 mm. Body oblique elongate, 1.48 times as long as high ( Fig. 20A ).

HEAD. Face 2.0 times as broad as high, longitudinally slightly convex centrally, forming rectangular area, sublateral portion longitudinally slightly concave ( Fig. 20B ). Clypeal suture indistinct. Clypeus flat, matte, striated, apically flat, with sharp apical margin. Basal portion of mandible smooth; teeth sharp, of equal length. Malar space smooth, equal to basal width of mandible. Gena glossy, smooth and shiny. Vertex ( Fig. 21G ) smooth, posterior portion from behind ocelli to occipital carina slanted almost vertically, slightly concave. Postero-ocellar distance 1.5 times ocular-ocellar distance ( Fig. 21G ). Frons with fine leathery texture, lower portion slightly concave ( Fig. 21G ). Antenna slightly shorter than body, with 24 flagellomeres, median portion very thickened ( Fig. 21F ). Occipital carina complete, tapered upwards.

MESOSOMA. Pronotum smooth, sparsely and shallowly punctate. Epomia distinct. Mesoscutum ovoid, 0.97 times as long as broad, convex, with granulated texture and distinct punctures ( Fig. 20E ). Notaulus indistinct ( Fig. 20E ). Scutellum evenly convex, almost smooth, with distinct sparse punctures. Postscutellum transverse, smooth. Mesopleuron ( Fig. 20C ) smooth, shiny, anterior portion with shallow punctures; lower portion with punctures indistinct; posterior portion smooth. Epicnemial carina short, defined only in ventral portion of mesopleuron. Sternaulus indistinct, defined in middle anterior part of mesopleuron. Metapleuron very long and narrow, with distinct shallow punctures, distance between punctures 0.75–1.2 times diameter of punctures. Juxtacoxal carina absent. Submetapleural carina complete. Fore wing with 1cu-a distinctly distad of M becoming Rs, 3rs-m absent, distal abscissa of M spectral; ramulus absent; length of vein Cu slightly longer than 2cu-a ( Fig. 21H ). Hind wing with cu-a strongly inclivous and interrupted at lower 0.16. Distal abscissa of Cu spectral. Distal abscissa of M spectral. Inner profile of basal portion of fore basitarsus distinctly bent. Hind coxa with fine and indistinct punctures. Basal portion of hind tibia slender, gradually thick toward apex. Propodeum gradually sloping in lateral view, with sparse fine punctures. Propodeal carinae absent except apical part of medial longitudinal carina and lateral part of posterior transverse carina closing area postero-externa ( Fig. 21C ).

METASOMA. T1 1.8 times as long as apically broad, smooth, petiole flat; postpetiole broad, convex, with sparse distinct punctures, without median dorsal carina or dorsolateral carina; ventrolateral carina weak; spiracle small, round ( Figs 20D , 21 A–B). T2 coarsely and sparsely punctate, broad posteriorly, 1.4 times as long as apically broad. T2 0.6 times as long as apically broad, parallel-sided, also coarsely and sparsely punctate. T3–T5 distinctly punctate, with same punctuation ( Fig. 21B ). Ovipositor very thin, 0.9 times as long as hind basitarsus ( Fig. 21E ).

COLOUR. Body mostly reddish yellow. Flagellomeres starting from 3 dorsally, head (excluding basal parts of mandibles), pronotum, mesoscutum (except yellow anterior lateral edges), scutellum and central part of T2–T5 black. Palpi white. Pterostigma and veins yellowish brown. Wings hyaline.

Male

Unknown.

Remarks

This species is similar to P. tamasek sp. nov., but can be distinguished from the latter by the following combination of characters: body short ( Fig. 20A ); mesoscutum not protruding above pronotum; scutellum entirely black; lengths of veins 2-Cu and 2cu-a equal; ovipositor short, 0.9 times as long as hind basitarsus ( Fig. 21E ).

Distribution

China ( Hong Kong).

The palpator group

Figures

Fig. 20. Palpostilpnus trifolium sp. nov., holotype, ♀ (NHRS HT-HEVA000010861). A. Lateral habitus. B. Head, anterior view. C. Mesopleuron. D. T1, lateral view. E. Scutum.

Fig. 21. Palpostilpnus trifolium sp. nov., holotype, ♀ (NHRS HT-HEVA000010861). A. Metasoma, dorsal view. B. T2–T3, dorsolateral view. C. Propodeum, dorsal view. D. Hind leg. E. Ovipositor. F. Antenna. G. Vertex. H. Wing.