Palpostilpnus ranui, 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 : 28-31

Palpostilpnus ranui sp. nov.

urn:lsid:zoobank.org:act:10E16953-FB09-4B62-82BB-1102259700A1

Figs 15–16

Diagnosis

Body obliquely elongate ( Fig. 15A ). Postero-ocellar distance 2.8 times ocular-ocellar distance. Occipital carina complete. Epomia distinct. Epicnemial carina vestigial, only distinguishable on part of mesosternum. Propodeal carinae absent except for posterior portion of median longitudinal carina ( Fig. 16A ). T1 2.2 times as long as apically broad ( Fig. 15D ). Wings hyaline ( Fig. 16D ).

Etymology

The specific name is derived from the type locality, Ranu River, on the island of Sulawesi, Indonesia.

Material examined

Holotype

INDONESIA • ♀; Sulawesi, Tengah, near Morowali, Ranu River area ; 27 Jan.–27 Apr. 1980; NHMUK.

Paratype

INDONESIA • ♂; Sulawesi, Tengah, near Morowali, Ranu Lakes ; 7–10 Mar. 1980; NHMUK .

Description

Female

SIZE. Fore wing length 3.2 mm. Body obliquely elongate, 1.80 times as long as high ( Fig. 15A ).

HEAD. Face 1.6 times as broad as high, centrally with faint convexity, with fine granulose texture and dense punctures, distance between punctures 0.2–0.3 times diameter of punctures. Clypeal suture weak but distinct. Clypeus distinctly convex, shiny, with distinct transverse striation, apical margin sharp, slightly convex. Basal portion of mandible smooth; teeth sharp, dorsal tooth pointed, slightly longer than ventral tooth. Malar space smoother than face, slightly striate, 1.1 times as long as basal width of mandible. Gena glossy, sparsely punctate, near dorsal corner of eye with slight swelling, but not forming distinct carina. Vertex ( Fig. 16B ) punctate, posterior portion from behind ocelli to occipital carina steeply slanted. Postero-ocellar distance 2.8 times ocular-ocellar distance. Frons densely punctate, lower portion slightly concave. Antenna as long as body, with 25 flagellomeres, median portion moderately thickened. Occipital carina complete, tapered upwards.

MESOSOMA. Pronotum ventrally smooth, dorsally distinctly punctate. Epomia distinct along posterior margin of collar, indistinct from other striations when diverging from pronotal collar. Mesoscutum ( Fig. 15E ) ovoid, 0.95 times as long as broad, comparatively convex, with fine leathery texture and dense punctures. Notaulus indistinct. Scutellum evenly convex, with shallow punctures. Postscutellum with few lateral punctures. Mesopleuron ( Fig. 15C ) centrally mostly smooth and shiny, externally to this central area distinctly punctate. Epicnemial carina vestigial, only distinguishable on part of mesosternum. Sternaulus distinct, diagonally crossing mesopleuron from middle anterior part to hind lower margin of mesopleuron. Metapleuron very long and narrow, with distinct shallow punctures, distance between punctures 0.2–0.3 times diameter of punctures. Juxtacoxal carina vestigial. 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 distinctly longer than 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 basal portion of fore basitarsus distinctly bent. Hind coxa finely punctured on anterior face, posteriorly smooth. Propodeum ( Fig. 16A ) with shallow, moderately dense punctures, moderately sloping from near anterior margin to posterior end; propodeal carinae absent except for vestiges of median longitudinal carina; spiracle small, circular.

METASOMA. T1 2.4 times as long as apically broad ( Fig. 15D ); petiole dorsally flat, with large shallow punctures, laterally finely punctate; petiole smooth and flat; postpetiole narrow; dorsolateral carina distinct until spiracle but apically weak; ventrolateral carina complete; spiracle small, round, not prominent. T2–T5 punctate-areolate; T2 broad posteriorly, 0.80 times as long as apically broad. T3 0.70 times as long as apically broad, parallel-sided. Ovipositor 0.23 times as long as hind tibia.

COLOUR. Mostly yellowish and black. Head black; basal 0.8 of mandible, scape and pedicel pale yellow; mandible apex and basal flagellomere ferruginous, flagellum gradually changing to dark brown by fourth flagellomere. Mesosoma mostly pale yellow; median portion of pronotum, posterior 0.6 of mesoscutum, axillary trough, apex of scutellum, postscutellum, mesopleuron except for anterodorsal spot, mesosternum and longitudinal dash on propodeum black. Fore and mid legs pale yellow, gradually darker towards apex. Hind coxa pale yellow; trochanter and femur ferruginous; hind tibia basally pale yellow, gradually changing to ferruginous towards apex; hind tarsus pale yellow. Wings hyaline. Pterostigma and veins yellowish brown. Metasoma mostly pale yellow or light ferruginous; postpetiole of T1 with dark ferruginous and black areas; T2–T5 with distinct sub-apical transverse stripes, black on T2 and gradually lighter until ferruginous on T5. Ovipositor sheath basally pale yellow, apically brown.

Male

Forewing 3.3 mm long. Antenna with 23 flagellomeres. Otherwise very similar to female except for slightly more slender body and secondary sexual dimorphism.

Remarks

This species is most similar to P. hainanensis sp. nov., particularly because of the obliquely elongated body and colour pattern. Palpostilpnus ranui sp. nov. can be differentiated from the latter by several relatively small differences, including more extensive black marks on the mesoscutum, mesopleuron and metasoma ( Fig. 15A, C, E ); tibia not apically black (vs apical 0.25 black in P. hainanensis sp. nov.); propodeum with traces of the median dorsal carina (vs entirely absent); extensive areas on anterior and posterior margins of mesopleuron densely punctate (vs mesopleuron almost entirely smooth); and epicnemial carina absent from mesopleuron (vs present on lower portion of mesopleuron).

Distribution

Indonesia (Sulawesi).

Figures

Fig. 15. Palpostilpnus ranui sp. nov., holotype, ♀ (NHMUK). A. Lateral habitus. B. Head, anterior view. C. Mesopleuron. D. T1 and T2, dorsal view. E. Scutum.

Fig. 16. Palpostilpnus ranui sp. nov., holotype, ♀ (NHMUK). A. Propodeum, dorsal view. B. Vertex. C. Antennae. D. Forewing.