Stauropoctonus aurantiacus Shimizu & Lima, 2017

Pham, Nhi Thi, Matsumoto, Rikio, Cao, Nga Thi Quynh & Shimizu, So, 2022, First record of the genus Stauropoctonus Brauns (Ichneumonidae: Ophioninae) from Vietnam, with description of a new species, Zootaxa 5155 (1), pp. 142-150 : 143-144

publication ID	https://doi.org/ 10.11646/zootaxa.5155.1.8
DOI	https://doi.org/10.5281/zenodo.6669390
persistent identifier	https://treatment.plazi.org/id/7335A22F-FF8E-FFF7-FF5E-945EE6ECF753
treatment provided by	Plazi
scientific name	Stauropoctonus aurantiacus Shimizu & Lima, 2017
status

Treatment

( Figures 1A View FIGURE 1 , 2A, 2B View FIGURE 2 , 3 View FIGURE 3 , 5A View FIGURE 5 )

Stauropoctonus aurantiacus Shimizu & Lima, 2017: 8 . Holotype: ♂, Japan (NIAES).

Diagnosis. Reddish yellow with black markings on mesoscutum and metasomal tergites; occipital carina entirely absent; mesosternum with posterior transverse carina complete; fore wing vein 1cu-a distad of M&RS.

Material examined. 1 female ( IEBR), VIETNAM, Gia Lai Province, Kon Ka Kinh National Park , 8 June 2011, T. Q. Nguyen coll. ; 1 female ( IEBR), VIETNAM, Gia Lai Province, Kon Chu Rang National Park , 1091 m, 27 April 2016, L. T. P. Nguyen coll. ; 1 male ( IEBR), VIETNAM, Gia Lai Province, Kon Ka Kinh National Park , 13 March 2019, P. V. Pham coll.

Description of females. Head with FI = 0.74–0.75, GOI = 3.0 –3.2, ECI = 0.78–0.8. Antenna with 76 flagellomeres, first flagellomere 3.8–4.0× longer than wide, 1.5× length of second, 20 th flagellomere 1.6× as long as wide; lower face 0.58–0.63× as wide as high, with small punctures, pubescent; clypeus in lateral view flat, 1.7× as wide as high, separated from face by weak impression; mandible twisted about 850; malar space short, about 0.3× mandibular basal width ( Fig. 3A View FIGURE 3 ); occipital carina completely absent.

Mesosoma. Pronotum subpolished, with fine punctures, except striated punctures medially; mesoscutum about 1.5– 1.6× as long as its maximum width, mat, with dense setae ( Fig. 3E View FIGURE 3 ); scutellum strongly convex, 1.7× as long as anterior width, with coarse punctures, dense setae, lateral carina present basally, posteriorly with winkles ( Fig. 3F View FIGURE 3 ); epicnemial carina strongly present on ventral half, its dorsal end extending towards anterior margin of mesopleuron; mesopleuron upper half subpolished, with fine punctures, ventrally with wrinkles, posterior end of sternaulus strong ( Fig. 3D View FIGURE 3 ); posterior transverse carina of mesosternum strong ( Fig. 5A View FIGURE 5 ), metapleuron with strong striations ( Fig. 3D View FIGURE 3 ); propodeum densely pilose, anterior area striated, spiracular area mat, pubescent, mediobasally concave, anterior transverse carina strong, posterior transverse carina reduced to lateral vestiges, posterior area longitudinally rugose, lateral longitudinal carina incomplete, propodeal spiracle elliptical, its outer margin touching lateral longitudinal carina ( Fig. 3F View FIGURE 3 ).

Wings ( Figs. 2A, 2B View FIGURE 2 ). Fore wing length 21–21.5 mm with AI = 0.72–0.75, CI = 0.88–1.1, DI = 0.48–0.53, ICI = 1.17–1.28, SDI = 0.91–0.94, SI = 0.24–0.26, SRI = 0.36–0.37, vein 1m-cu&M sinuate, vein 1cu-a distad of M&RS by about 0.26–0.32× length of 1cu-a, postero-distal corner of second discal cell ca. 90°, postero-distal corner of subbasal cell ca. 45°. Hind wing with NI = 1.2–1.3, BCI = 0.7–0.75, hind wing vein RA with 9–11 hamuli.

Legs. Mid leg with outer tibial spur straight, 0.9–0.95× as long as inner one, inner spur with posterior end weakly decurved; hind coxa 2.1–2.2× as long as its maximum width, hind femur 0.76–0.78× as long as hind tibia, outer tibial spur with slightly decurved tip, 0.7–0.72× as long as inner one, inner spur with posterior end weakly decurved, ventrally with long, erected setae, hind basitarsus 2.2× as long as second tarsomere, hind fourth tarsomere 3.0–3.2× as long as wide, claws long, pectinate with uniform height towards apex.

Metasoma with PI = 3.3–3.4, DMI = 1.2, LMI = 5.0–5.3, THI = 3.3–4.3, T1 with straight petiole, T2 with drop-shape thyridium; ovipositor strongly taped posteriorly, ovipositor sheath 0.1–0.15× length of hind tibia.

Colour. Reddish with black markings as follow: scape, pedicel, flagellomeres 1–8, ocellar area, three stripes on mesoscutum, dorsal part of T3, a spot on antero-dorsally of T4 and T5 onwards, wing veins reddish brown to black, wing vein reddish brown to black, pterostigma reddish brown.

Distribution. Previously known from Japan ( Shimizu & Lima, 2017). These are the first records of this species from Vietnam.

Remarks. The Vietnamese specimens have the fore wing vein 1cu-a distad of M&RS by about 0.26–0.35× length of 1cu-a, smaller AI (0.72–0.76), greater CI (0.88–1.1), ICI (1.17–1.30), and hind wing NI (1.2–1.3) in comparison with the male holotype from Japan. In addition, the Vietnamese specimens have the epicnemial carina strongly present on ventral half, its dorsal end extending towards anterior margin of mesopleuron whereas this carina rather weak in the male holotype. Otherwise, Vietnamese specimens agree with the description of the holotype of S. aurantiacus . It is worthy that the 20 th flagellomere of females is clearly stouter and shorter than that of males.