Stirexephanes rufopetiolaris Riedel 2023, nov. sp.
Creators: name: Riedel, Matthias
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Stirexephanes
Stirexephanes rufopetiolaris

description: Stirexephanes rufopetiolaris nov. sp.
(Figs 39A–D)
Holotype. (♀) Indonesia: Sumatera Barat, Joron Akar Gadang, Simpang Tanjung Nam IV, Danau Kembar, Solok, 1.0579°S 100.697°E, 1412 m, 13-May-2016, H. Hamid, COI 0, INDOBIOSYS-CCDB23977-G04 (ZSM).
Paratype. (♂) Malaysia: SW Sabah, nr Long Pa Sia (West), c. 1010 m, 25.xi.–8.xii.1987, Mal. trap 1 b, C. van Achterberg (Leiden); Indonesia: Sumatera Barat, Lahan basah, Andalas University, Bukit, Karamuntiang, Padang, 0.9087°S 100.478°E, 400 m, 23–Jan–2016, H. Hamid, INDOBIOSYS-CCDB23977-A05 (ZSM).
Etymology. The species name refers to the reddish 1 st tergite.
Description. ♀. Body length 8.1 mm.
Head. Flagellum with 30 flagellomeres, slightly lanceolate; 1 st flagellomere 3.2 × longer than wide, 9 th flagellomere square, widest flagellomeres 1.4 × wider than long, apical flagellomere very blunt. Temple very short, strongly and linearly narrowed behind eye. OED 1.0 × and OOD 0.6 × ocellar diameter. Vertex finely granulated. Frons shining, finely granulate and with superficial punctures dorsally. Face densely punctate, with some transverse rugae medially. Clypeus large, almost flat, with sparse punctures; apical margin blunt and almost straight (fig. 39A). Mandible long and rather slender, with two teeth; ventral tooth much smaller and slightly bent inwards. Malar space 1.0 × as long as width of mandibular base. Gena with sparse fine punctures. Genal carina reaching hypostomal carina away from mandibular base.
Mesosoma. Notaulus distinctly impressed in frontal fourth of mesoscutum. Mesoscutum finely and densely rugose-punctate, dull. Sternaulus distinctly impressed in frontal half of mesopleuron. Mesopleuron finely rugose-punctate and ± striate; speculum partly smooth (fig. 39B). Metapleuron finely rugose and striate; juxtacoxal carina present. Scutellum slightly elevated, with lateral carina in basal 0.8, slightly longer than wide, with sparse punctures. Propodeum completely carinated, with blunt short apophysis (fig. 39C); spiracle slit-shaped. Area basalis trapezoid, wider than long, without median tubercle. Area superomedia hexagonal, 1.3 × longer than wide; costula reaching at basal 0.35 of its length. Hind coxa with fine dense punctures, without scopa; hind femur densely punctate, 4.3 × longer than wide. Claws simple, strongly bent apically. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 2.0 × their diameter. Vein 1cu-a interstitial.
Metasoma (fig. 39D). Oxypygous. Petiole about as wide as high. Postpetiole slightly widened, without latero-median carina; median field not separated, finely granulate; lateral field finely punctate. Gastrocoelus small, longer than wide, with fine ridges. Thyridium small, comma-shaped, 0.3 × as wide as the interval between thyridia. 2 nd tergite 1.1 × longer than wide. 2 nd and 3 rd tergites finely and densely rugose-punctate, dull. Following tergites finely granulate, slightly shining. 2 nd to 5 th sternites with median folds. Ovipositor sheath narrow, reaching behind metasomal apex by length of 7 th tergite.
Colour. Black. Flagellum black, flagellomeres 6–13 ivory dorsally. Palps ivory. Median spot of mandible, lateral margin of clypeus and scape ventrally reddish. Mesosoma black; scutellum, postscutellum, posterior half of mesopleuron, metapleuron and propodeum red. 1 st tergite red; following tergites black. 2 nd tergite diffusely reddish in posterior half and with narrow yellow apical margin. Apical band of 6 th tergite and 7 th tergite mainly ivory (fig. 40D). Fore and mid coxae and all trochanters ivory; hind coxa black ventrally, red dorsally. Fore and mid femora and tibiae and fore tarsus reddish; mid tarsus brown. Hind femur, tibia and tarsus black; hind tibia with small yellowish spot basally. Wings almost hyaline; pterostigma ochreous.
♂. Body length 10.8–11.6 mm. Flagellum with 34–35 flagellomeres, bristle-shaped; 1 st flagellomere 3.2–3.3 × longer than wide, distal flagellomeres slightly nodose. Tyloids on flagellomeres 6–13, linear, maximally 0.8× as long as their flagellomeres. OED 1.1 × and OOD 0.9 × ocellar diameter. Malar space 0.6 × as long as width of mandibular base. Notaulus impressed in frontal 0.2 of mesoscutum. Mesoscutum with fine dense and ± superficial punctures, dull. Mesopleuron and metapleuron densely and superficially punctate, not striate. Hind femur 4.2–4.6 × longer than wide. 2 nd tergite 1.1 × longer than wide. Hypopygium unmodified, apical margin slightly rounded. Structure otherwise as described for the ♀.
Colour. Black. Flagellum black, basal flagellomeres ± reddish, flagellomeres 11/12–18/19 ivory dorsally. Palps, mandible except teeth, clypeus, face, gena, frontal orbit, sometimes outer orbit and scape ventrally ivory. Mesosoma black; propleuron, and sometimes collar and spot of tegula ivory. Scutellum ±, postscutellum, tegula, sometimes posterior half of mesopleuron, metapleuron and propodeum red. 1 st tergite red; 2 nd tergite black, reddish or yellowish in apical 0.4–0.5. Following tergites black; sometimes 3 rd and 4 th tergites with narrow yellowish apical bands; apical band of 6 th tergite, 7 th tergite and paramere ivory. Fore coxa and fore and mid trochanters ivory; mid coxa reddish-yellow, with apical ivory spot; hind coxa red, diffusely infuscate ventrally. Fore and mid femora and tibiae and fore tarsus reddish or ochreous; mid tarsus brown; hind leg black; hind tibia with external ivory stripe, sometimes with basal ivory spot. Pterostigma ochreous.
Remarks. This new species differs from all other known Stirexephanes species by the bicolored mesosoma and red 1 st tergite.
Distribution. Known from Borneo and Sumatra.
description: Published as part of Riedel, Matthias, 2023, Contribution to the knowledge of the Ichneumoninae (Hymenoptera, Ichneumonidae) from Maritime Southeast Asia, pp. 1-94 in Zootaxa 5363 (1) on pages 87-89, DOI: 10.11646/zootaxa.5363.1.1, http://zenodo.org/record/10146851