Palpostilpnus mangrovi, 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 : 21-24

Palpostilpnus mangrovi sp. nov.

urn:lsid:zoobank.org:act:A751D18B-92A7-455E-ABA0-203AF40E1C01

Figs 11–12

Diagnosis

Body obliquely elongate ( Fig. 11A ). Postero-ocellar distance 2.0 times as long as ocular-ocellar distance ( Fig. 12D ). Occipital carina complete. Epomia indistinct. Epicnemial carina very short, defined only in lower portion of mesopleuron. Propodeal carinae absent, except forming area petiolaris ( Fig. 12B ). T1 1.8 times as long as apically broad ( Fig. 11C ). Fore wing infuscate in middle ( Fig. 12E ).

Etymology

The specific epithet refers to the habitat in which this species was collected.

Material examined

Holotype

SINGAPORE • ♀; Nee Soon Swamp Forest ; 1°23′00.3″ N, 103°48′46.5″ E; Malaise trap (NS1); 27 Jun. – 3 Jul. 2013; NUS leg.; barcode: ZRC_30042; LKCNHM.

Paratypes

SINGAPORE • 1 ♀; Nee Soon Swamp Forest ; 1°23′04.2″ N, 103°48′40.7″ E; Malaise trap (NS2); 13– 20 Jun. 2012; NUS leg.; barcode: ZRC_BDP0029983; NHRS PT-HEVA000010858 • 1 ♀; Bukit Timah ; 1.35127° N, 103.78161° E; maturing secondary forest; Malaise trap (BT09); 20– 27 Jul. 2017; NUS leg.; barcode: ZRC_BDP0018400; LKCNHM • 1 ♀; Nee Soon Swamp Forest ; 1°23′07.83″ N, 103°48′39.48″ E; Malaise trap #3; 13–20 Mar. 2006; K.I. Yeo leg.; RBINS .

Description

Female

SIZE. Fore wing length 2.3 mm. Body oblique elongate, 1.50 times as long as high ( Fig. 11A ).

HEAD. Face 1.5 times as broad as high, with moderately dense setae, longitudinally slightly convex centrally, forming rectangular area; with fine granulose texture, impunctate; sublateral portion slightly longitudinally concave ( Fig. 11B ). Clypeal suture indistinct. Clypeus slightly convex, matte, apically straight (not evenly convex downwards), with sharp apical margin. Mandible basally with granulose texture; teeth sharp, upper tooth slightly broader than lower tooth. Malar space smooth, 1.5 times as long as mandibular width. Gena glossy, smooth. Vertex coarsely punctate, distance between punctures 0.5–2.0 times diameter of puncture, posterior portion from behind ocelli to occipital carina slanted almost vertically, slightly concave ( Fig. 12D ). Frons with fine leathery texture, lower portion slightly concave. Postero-ocellar distance 3.0 times as long as ocular-ocellar distance. Antenna slightly longer than body, with 25 flagellomeres, median portion slightly thickened ( Fig. 11A ). Occipital carina complete, tapered upwards.

MESOSOMA. Pronotum coarsely punctate dorsally, smooth and shining ventrally. Epomia indistinct. Mesoscutum ovoid, 0.87 times as long as broad, comparatively convex, with coarse dense punctures. Notaulus indistinct. Scutellum evenly convex, with coarse dense punctures. Postscutellum transverse, smooth. Mesopleuron smooth, polished, shallowly and sparsely punctate, pubescent with white setae. Epicnemial carina very short, defined only on lower portion of mesopleuron. Sternaulus indistinct. 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 0.6 of length of 1cu-a, 3rs-m absent, distal abscissa of M spectral; ramulus present; length of vein Cu slightly longer than 2cu-a ( Fig. 12E ). Hind wing with cu-a strongly inclivous and interrupted at lower 0.1. Distal abscissa of Cu pigmented. Distal abscissa of 1Cu spectral. Inner profile of basal portion of fore basitarsus distinctly bent. Hind coxa with fine uneven punctures. Hind femur stout, 4 times as long as its maximum width ( Fig. 12C ). Basal portion of hind tibia slender, gradually thick toward apex. Longer spur of hind tibia 0.5 times as long as hind basitarsus. Propodeum steeply sloping from near anterior margin to posterior end in lateral view, sparsely and coarsely punctate ( Fig. 12B ). Propodeal carinae partly present, forming trapezoidal combined area superomedia and area petiolaris ( Fig. 12B ).

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. 11C ). T2 coarsely and sparsely punctate, with distinct gastrocoelus ( Fig. 12A ). T3 coarsely and sparsely punctate ( Fig. 12A ). Ovipositor thin, 1.4 times as long as hind basitarsus ( Fig. 12C ).

COLOUR. Body mostly black. Scape, pedicel, first and second flagellomeres ventrally, T1 (except postpetiole black), anterior half of T2, fore margin of T3 and dorsal part of hind femur pale yellow, and tegula and legs (except hind trochanter, ventral part of hind femur and apical part of hind tibia black) white. Wings infuscate in middle.

Male

Unknown.

Remarks

Palpostilpnus mangrovi sp. nov. is similar to P. striator Aubert, 1961 and P. papuator ( Aubert, 1961) but can be distinguished from them by the following combination of characters: scutellum without wrinkles ( Fig. 11D ); body coarsely punctate ( Fig. 11A ); hind coxa, T1 and T2 partly yellowish ( Fig. 11A ); hind tarsus white ( Fig. 11A ); antenna with scape pale yellow, flagellomeres 1–3 varying from yellow to brown ( Fig. 11A ). Palpostilpnus striator and P. papuator have strong wrinkles on the scutellum; the body is rather polished and impunctate; hind coxa, tarsus and metasoma are black; middle flagellomeres of the antenna are coloured white dorsally.

Distribution

Singapore.

Figures

Fig. 11. Palpostilpnus mangrovi sp. nov., holotype, ♀ (LKCNHM). A. Lateral habitus. B. Head, anterior view. C. T1, dorsal view. D. Scutum.

Fig. 12. Palpostilpnus mangrovi sp. nov., holotype, ♀ (LKCNHM). A. Metasoma, dorsal view. B. Propodeum, dorsal view. C. Ovipositor. D. Vertex. E. Wings.