Palpostilpnus hainanensis, 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 : 17-18

Palpostilpnus hainanensis sp. nov.

urn:lsid:zoobank.org:act:CE2DDA98-118D-4106-8DB3-EED41FFB0A6A

Figs 9–10

Diagnosis

Body obliquely elongate ( Fig. 9A ). Postero-ocellar distance 3.0 times as long as ocular-ocellar distance ( Fig. 10G ). Occipital carina complete. Epomia indistinct. Epicnemial carina distinct, reaching to upper 0.7 of mesopleuron. Propodeal carinae absent. T1 1.8 times as long as apically broad ( Fig. 9D ). Wings hyaline ( Fig. 10H ).

Etymology

The specific name is derived from the type locality, Hainan Island.

Material examined

Holotype CHINA • ♀; Hainan, Bawangling Nature Reserve ; sweep net; 21– 22 Oct. 2008; Jieming Yao leg.; SCAU.

Description

Female

SIZE. Fore wing length 3.5 mm. Body oblique elongate, 1.60 times as long as high ( Fig. 9A ). HEAD. Face 1.6 times as broad as high, with moderately dense setae, slightly granulose and densely punctate, sublateral portion slightly longitudinally concave, centrally weakly convex ( Fig. 9B ). Clypeal suture very indistinct. Clypeus slightly convex, shiny, with weak transverse striation, apically straight (not evenly convex downwards) with sharp apical margin. Mandible polished, sparsely setose, with teeth sharp, upper tooth slightly broader than lower tooth. Malar space nearly polished, equal to mandibular width. Gena glossy, polished. Vertex ( Fig. 10G ) smooth, posterior portion from behind ocelli to occipital carina slanted almost vertically, slightly concave. Postero-ocellar distance 3.0 times as long as ocularocellar distance ( Fig. 10G ). Frons with fine leathery texture, lower portion slightly concave. Antenna as long as body, with 24 flagellomeres, median portion rather thickened, first flagellomere 3.5 times as long as its apical width and 1.27 times as long as second flagellomere. Occipital carina complete, tapered upwards.

MESOSOMA. Pronotum smooth, sparsely and shallowly punctate. Epomia indistinct. Mesoscutum ovoid, 0.8 times as long as broad, convex, with fine leathery texture and indistinct punctures ( Fig. 9E ). Notaulus indistinct ( Fig. 9C ). Scutellum evenly convex, almost smooth, with very weak and indistinct leathery texture, with shallow punctures. Postscutellum transverse, smooth. Mesopleuron polished, anterior portion with fine punctures, lower portion with punctures indistinct, pubescent with white setae; posterior portion with fine transverse wrinkles and fine indistinct punctures ( Fig. 9C ). Epicnemial carina very short, defined only in lower portion of mesopleuron ( Fig. 9C ). Sternaulus distinct, diagonally crossing mesopleuron from middle anterior part to hind lower margin of mesopleuron ( Fig. 9C ). Metapleuron very long and narrow, with distinct shallow punctures, distance between punctures 0.2–3.0 times diameter of punctures. Juxtacoxal carina distinct. Submetapleural carina complete. Fore wing with 1cu-a distad of M becoming Rs by 0.3 of length of 1cu-a, 3rs-m absent; distal abscissa of M spectral; length of vein Cu 1.4 times as long as 2cu-a ( Fig. 10H ). Hind wing with cu-a strongly inclivous and interrupted at lower 0.3. 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 uneven punctures. Hind femur stout, 3.9 times as long as its maximum width ( Fig. 10D ). Basal portion of hind tibia slender, gradually thick toward apex. Longer spur of hind tibia 0.6 times as long as hind basitarsus. Propodeum gradually sloping in lateral view, with sparse fine punctures ( Fig. 10C ). Propodeal carinae absent.

METASOMA. T1 1.8 times as long as apically broad, smooth, petiole flat; postpetiole broad, without median dorsal carina or dorsolateral carina; ventrolateral carina weak; spiracle small, round, slightly convex ( Fig. 10 A–B). T1 and T2 coarsely and sparsely punctate ( Fig. 10B ). T3 coarsely and sparsely punctate ( Fig. 10B ). Ovipositor very thin, 1.4 times as long as hind basitarsus ( Fig. 10E ).

COLOUR. Mostly yellow. Flagellomeres starting from third, head (except basal parts of mandibles and apical margin of clypeus), lower part of pronotum and mesopleuron, area of scuto-scutellar groove, apical portion of hind tibia and apical portion of fifth tarsomere, transverse marks in hind part of T1, transverse mark of T2 and ovipositor sheath black. Scape, pedicel, base of first flagellomere, mandible except teeth, maxillary and labial palpi, all coxae and trochanters yellowish white. Pterostigma and veins yellowish brown. Wings slightly yellowish hyaline.

Male

Unknown.

Remarks

This species is similar to P. singaporensis sp. nov., from which it can be distinguished by the following combination of characters: metasoma almost entirely yellow (vs with broad transverse black bands) and ovipositor 1.4 times as long as hind basitarsus (vs 0.6 times in P. singaporensis sp. nov.).

Distribution

China (Hainan).

Figures

Fig. 9. Palpostilpnus hainanensis sp. nov., holotype, ♀ (SCAU). A. Lateral habitus. B. Head, anterior view. C. Mesopleuron. D. T1, dorsolateral view. E. Scutum.

Fig. 10. Palpostilpnus hainanensis sp. nov., holotype, ♀ (SCAU). A–B. Metasoma, lateral and dorsal views. C. Propodeum, dorsal view. D. Hind leg. E. Ovipositor. F. Antennae. G. Vertex. H. Wings.