Palpostilpnus aki, 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 : 10-13

Palpostilpnus aki sp. nov.

urn:lsid:zoobank.org:act:45415886-F552-46D2-89D7-6DD771A1AAAA

Figs 5–6

Diagnosis

Body obliquely elongate ( Fig. 5A ). Postero-ocellar distance 1.5 times as long as ocular-ocellar distance ( Fig. 6G ). Occipital carina complete. Epomia absent. Epicnemial carina present on lower half of mesopleuron. Propodeal carinae absent except for posterior portion of median longitudinal carina ( Fig. 6C ). T1 2.35 times as long as apically broad ( Fig. 6A ). Wings hyaline ( Fig. 6H ).

Etymology

This species is named after Dr. Akihiro Nakamura of the Xishuangbanna Tropical Botanical Garden.

Material examined

Holotype

CHINA • ♀; Yunnan, Ailao Shan ; 2200 m a.s.l.; Plot B; Malaise trap 323 XTBG; Aug. 2011; A. Nakamura et al. leg.; KIZ.

Description

Female

SIZE. Fore wing length 3.41 mm. Body oblique elongate, 1.42 times as long as its height ( Fig. 5A ).

HEAD. Face 1.7 times as broad as high, with moderately dense setae, strongly granulose and densely punctate, centrally weakly convex ( Fig. 6B ). Clypeal suture indistinct. Clypeus slightly convex, with basal half granulose and apical half weakly transversely striate, apical margin sharp, slightly convex. Mandible polished, sparely setose, with dorsal tooth slightly longer than ventral tooth. Malar space nearly polished, 1.14 times as long as mandibular basal width. Gena glossy, sparsely punctate. Vertex punctate, posterior portion from posterior ocelli to occipital carina steeply slanted. Frons densely punctate, with lower half transversely rugose. Postero-ocellar distance 1.5 times as long as ocular-ocellar distance. Antenna shorter than body length, with 24 flagellomeres, ventral side from eighth flagellomere to apex flattened and thickened ( Fig. 6F ). Occipital carina complete.

MESOSOMA. Pronotum ventrally smooth, dorsally distinctly punctate. Epomia absent. Mesoscutum ovoid, 0.8 times as long as wide, weakly convex, with leathery texture and dense punctures ( Fig. 5E ). Notaulus absent ( Fig.5C ). Scutellum slightly evenly convex, shallowly punctate, with apex polished. Postscutellum polished, with scattered punctures. Mesopleuron polished, sparsely punctate, area above dorsal end of epicnemial carina smooth and weakly rugose ( Fig. 5C ). Epicnemial carina reaching to dorsal 0.5 of mesopleuron ( Fig. 5C ). Sternaulus absent ( Fig. 5C ). Metapleuron punctuate and setose, punctures closed. Juxtacoxal carina absent. 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; ramulus absent; length of vein Cu slightly longer than 2cu-a ( Fig. 6H ). Hind wing with cu-a strongly inclivous and interrupted at lower 0.18. Distal abscissa of Cu spectral. Distal abscissa of M spectral. Inner profile of fore basitarsus with basal half distinctly bent. Hind coxa with sparse punctures.Hind femur stout, 2.6 times as long as its maximum width ( Fig. 6D ). Basal portion of hind tibia slender, gradually thick toward apex. Longer spur of hind tibia 0.4 times length of hind basitarsus. Propodeum gradually sloping in lateral view, shallowly punctate, punctures dense on central area and metapleuron, sparser on lateral portion of propodeum. Propodeal carinae absent except for apical portion of median longitudinal carina ( Fig. 6C ).

METASOMA. T1 2.35 times as long as apically broad, petiole flattened, smooth, centrally with scattered punctures; postpetiole densely punctate, without dorsolateral or median dorsal carinae; ventrolateral carina weak; spiracle small and slightly projected ( Figs 5D , 6A ). T2 coarsely and densely punctate ( Fig. 6A ). T3–T5 coarsely and densely punctate, punctures closer than those of T2 ( Fig. 6B ). T6 mostly finely and sparsely punctate, centrally polished. Ovipositor very thin, 1.32 times as long as hind basitarsus ( Fig. 6E ).

COLOUR. Head black. Mandible whitish yellow with teeth apically yellowish brown. Palpi white. Antenna black brown, scape yellowish brown, ventral side of petiole light brown, ventral side from eighth flagellomere to apex brown. Mesosoma yellowish brown, mesoscutum centrally and laterally black brown; apex of scutellum fuscous; mesopleuron with epicnemium black; basal half of propodeum fuscous and central area from base to apex black. Fore and middle legs brownish yellow, fore and middle trochanters whitish yellow, mid tibia and tarsus very lightly fuscous; hind coxa brownish yellow, trochanter fuscous, hind femur brownish yellow with apical 0.3 fuscous, hind tibia fuscous with basal 0.5 whitish yellow; hind tarsus fuscous with basal half of basitarsus and ventral sides of second to fifth segments brownish yellow. T1 entirely black; T2 with basal half and apical margin whitish yellow, with a transverse black band behind middle; T3–T4 black brown with basal and apical margins whitish yellow. Wings hyaline, veins and stigma fuscous. Ovipositor sheath slightly fuscous.

Male

Unknown.

Remarks

This species is similar to P. rotundatus Sheng & Sun, 2013 , but differs from it by the absence of the median propodeal longitudinal carina ( Fig. 6C ). It is also similar to P. trifolium sp. nov. and P. tamasek sp. nov., from which it differs by the entirely reddish anterior and lateral part of the mesonotum ( Fig. 5E ) and entirely reddish scutellum (vs black anterior and yellowish lateral part of mesonotum and black scutellum in the latter species) and by the long T1 (2.35 times as long as apically broad, vs 1.8–1.9 times as long as apically broad in P. trifolium sp. nov. and P. tamasek sp. nov.).

Distribution

China (Yunnan).

Figures

Fig. 5. Palpostilpnus aki sp. nov., holotype, ♀ (KIZ). A. Lateral habitus. B. Head, anterior view. C. Mesopleuron. D. T1–T3, lateral view. E. Scutum.

Fig. 6. Palpostilpnus aki sp. nov., holotype, ♀ (KIZ). A. T1 and T2, dorsal view. B. T3–T5, dorsal view. C. Propodeum, dorsal view. D. Hind leg. E. Ovipositor. F. Antenna. G. Vertex. H. Wing.