Palpostilpnus angka, 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 : 14-17

Palpostilpnus angka sp. nov.

urn:lsid:zoobank.org:act:4CDE8813-7CC5-4B11-A2F8-0CA4EAAAF099

Figs 7–8

Diagnosis

Body oblique elongate ( Fig. 7A ). Postero-ocellar distance 2.0 times as long as ocular-ocellar distance ( Fig. 8G ). Occipital carina complete. Epomia distinct. Epicnemial carina distinct, reaching to upper 0.6 of mesopleuron. Carinae of propodeum absent, with pleural carina present posteriorly, sparsely punctate ( Fig. 8C ). T1 1.75 times as long as apically broad. Wings hyaline. T2–T5 centrally with a transverse black band ( Fig. 8B ).

Etymology The species name refers to Doi Ang Ka (Thai: ดอยอ่างขาง), the former name of the type locality, Doi

Inthanon.

Material examined

Holotype

THAILAND • ♀; Chiang Mai, Doi Inthanon National Park, Chomthong ; 18°32′20.5″ N, 98°36′05.3″ E; 710 m a.s.l.; Malaise trap QSBG 2014-242 ; 27 Aug.–29 Sep. 2014; R. Sawkord, T. Somboonchai and S. Suriya leg.; QSBG.

Description

Female

SIZE. Fore wing length 3.1 mm. Body oblique elongate, 1.50 times as long as its height ( Fig. 7A ).

HEAD. Face 1.6 as broad as high, with moderately dense setae, granulose and punctate, centrally slightly longitudinally concave ( Fig. 7B ). Clypeal suture absent. Clypeus slightly convex, with fine striations, apical margin weakly rounded. Mandible polished, sparely setose, with upper tooth slightly broader than lower tooth ( Fig. 7B ). Malar space 0.83 times as long as mandibular basal width. Gena polished, with separated minute punctures. Vertex rugose-punctate, almost vertically slanted behind posterior ocelli ( Fig. 8G ). Frons punctate, with granulose texture between punctures. Postero-ocellar distance 2.0 times as long as ocular-ocellar distance. Antenna shorter than body length, with 24 flagellomeres, moderately thickened and ventrally flattened from fifth to sixteenth flagellomeres, first flagellomere 3.80 times as long as its apical width and 1.25 times as long as second flagellomere ( Fig. 8F ). Occipital carina complete.

MESOSOMA. Pronotum ventrally smooth, dorsally distinctly rugose and punctate. Epomia distinct. Mesoscutum ovoid, 0.75 times as long as wide, with granulose texture and punctate. Notaulus absent ( Fig. 7A ). Scutellum flattened, sparsely punctate. Postscutellum polished, with scattered punctures. Mesopleuron punctate dorsally and ventrally, centrally with an oblique smooth area ( Fig. 7A ). Epicnemial carina distinct, reaching to upper 0.6 of mesopleuron ( Fig. 7A ). Sternaulus absent ( Fig. 7A ). Metapleuron sparsely punctate. Juxtacoxal 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 equal to that of 2cu-a. Hind wing with cu-a strongly inclivous and interrupted at lower 0.2. 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, 3.3 times as long as its maximum width ( Fig. 8D ). Basal portion of hind tibia slender, sharply thick toward apex. Longer spur of hind tibia 0.46 times as long as hind basitarsus. Propodeum gradually sloping in lateral view, punctate. Propodeal carinae absent except carina of area postero-externa ( Fig. 8C ).

METASOMA. T1 1.75 times as long as apically broad, petiole flattened, smooth, centrally with scattered punctures; postpetiole sparsely punctate, with dorsolateral or median dorsal carinae; ventrolateral carina distinct; spiracle small and rather projected ( Fig. 7D ). T2 coarsely and densely punctate ( Figs 7D , 8A ). T3–T5 coarsely and densely punctate ( Fig. 8B ). Ovipositor very thin, 0.6 times as long as hind basitarsus ( Fig. 8E ).

COLOUR. Head black. Mandible yellowish with apical tooth dark brown. Antenna black, scape whitish yellow, first and second flagellomeres fuscous, ventral sides of sixth to twenty-second flagellomere sandy-brown. Palpi whitish yellow. Mesosoma light testaceous. Legs testaceous, fore coxa and trochanter ivory, apex of hind femur fuscous; hind tibia with apical 0.3 fuscous. T1 testaceous with apex dark brown; T2 to T4 testaceous and with a transverse black band, T5 testaceous. Ovipositor sheath fuscous. Wings hyaline, veins and stigma fuscous.

Male

Unknown.

Remarks

This species is similar to P. hainanensis sp. nov. and P. singaporensis sp. nov., but it differs from P. hainanensis sp. nov. by having T2 to T5 with transverse black bands (vs T2 with light brown band, T3 to T5 with a pair of brown spots laterally); hind femur with apex black (not black in P. hainanensis sp. nov.); meosoma entirely yellow (vs yellow with lower side of mesopleuron and propleuron black). It differs from P. singaporensis sp. nov. by having a shorter T1 (1.75 times as long as apically broad vs 2.0 times as long as apically broad).

Distribution

Thailand (Chiang Mai).

Figures

Fig. 7. Palpostilpnus angka sp. nov., holotype, ♀ (QSBG 2014-242). A. Lateral habitus. B. Head, anterior view. C. Mesopleuron. D. T1, dorsolateral view. E. Scutum.

Fig. 8. Palpostilpnus angka sp. nov., holotype, ♀ (QSBG 2014-242). A. T2–T4, dorsal view. B. T4–T5, dorsal view. C. Propodeum, dorsal view. D. Hind leg. E. Ovipositor. F. Antennae. G. Vertex.