Mesochorus (Stictopisthus) kinabaluensis Riedel 2023, nov. sp.
Creators: name: Riedel, Matthias
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Mesochorus
Mesochorus kinabaluensis

description: Mesochorus (Stictopisthus) kinabaluensis nov. sp.
(Figs 3B, 9H, 14D, 18A, 22L)
Holotype. (♀) [green] Kinabalu Park, 6°5´N 116°33´E, Sorinsim, SW III 40 years; [white] SW III, B 5, F 1, 7.3.1997 A. Floren (ZSM).
Description. ♀: Body length 4.8 mm. Fore wing 3.8 mm.
Head. Flagellum with 36 flagellomeres; 1 st flagellomere 7.0 × longer than wide and 1.8 × longer than 2 nd flagellomere, 0.7 × as long as eye; 2 nd flagellomere 4.3 × longer than wide; preapical flagellomere 2.9 × longer than wide. Occipital carina complete medially. Temple strongly and roundly narrowed behind eye, dorsally 0.3 × as long as eye. OED 1.5 × and OOD 0.8 × ocellar diameter. Frons smooth, with fine transverse aciculation laterally. Face (Fig. 9H) densely punctate, without median ridge, width 1.0 × combined length of face and clypeus and 1.0 × eye length; inner eye margins parallel. Subantennal transverse carina not dipped medially. Malar space and narrow facial orbit striate. Malar space 1.1 × as long as width of mandibular base. Mandible with two equal teeth. Genal carina reaching hypostomal carina away from mandibular base, both carinae low.
Mesosoma. 1.7 × longer than high. Side of pronotum smooth. Mesoscutum with dense punctures, shining. Scuto-scutellar groove (Fig. 14D) with c 12 longitudinal ridges. Scutellum rounded in profile, with rather dense punctures. Mesopleuron densely punctate fronto-dorsally, with rather dense to dense punctures ventrally. Dorsal end of epicnemial carina reaching frontal margin of mesopleuron. Metapleuron with rather dense punctures. Submetapleural carina low. Propodeum (Fig. 18A) completely carinate. Area basalis almost rectangular, slightly longer than wide. Area superomedia 1.9 × longer than wide and 1.0 × as long as area petiolaris, smooth; anterior transverse carina (costula) reaching at 4/10 of its length. Area petiolaris as long as wide. Hind femur 4.3 × longer than wide; hind metatarsus 0.6 × as long as hind tibia and 3.0 × longer than 2 nd hind tarsomere; hind claw with two small basal teeth. Areolet shortly sessile frontally; vein 2m-cu in its middle. Vein 1cu-a postfurcal by 0.6× its length. Postnervulus intercepted basad its middle. Hind wing with 4 distal hamuli. Nervellus of hind wing vertical.
Metasoma. 1 st tergite 2.8 × longer than wide. Postpetiolus longitudinally striate. 2 nd tergite 1.3 × wider than long. Thyridium comma-shaped. Ovipositor sheath (Fig. 22L) with sparse setae, 8.3 × longer than wide, 0.6 × as long as hind tibia and 1.0 × as long as hind metatarsus, continuously and strongly narrowed towards apex.
Color. Head reddish-yellow. Palps, mandible except teeth, malar space, scape and pedicel yellow. Flagellum brownish, basal flagellomere ochreous. Mesosoma yellowish; pronotum, tegula, mesopleuron and metapleuron pale yellow. 1 st tergite reddish-brown, basally yellowish, with reddish apical spot. 2 nd tergite yellow, with large brown V-shaped spot in basal half. 3 rd tergite brown, with yellow band in basal 0.2. 4 th and 5 th tergites brown, narrowly yellow laterally; following tergites yellow. Ovipositor sheath pale brownish. Fore and mid coxae and all trochanters cream-yellow; legs otherwise yellow; hind tibia basally and in apical 0.2 brownish. Pterostigma ochreous-hyaline.
♁ unknown.
Taxonomical remark. This new species belongs to the subgenus Stictopisthus and is characterized by brownish 3 rd to 5 th tergites and the strongly narrowed ovipositor sheath which is almost pointed apically.
description: Published as part of Riedel, Matthias, 2023, Contribution to the taxonomy of the Southeast Asian Mesochorinae (Hymenoptera, Ichneumonidae), pp. 1-72 in Zootaxa 5245 (1) on pages 17-18, DOI: 10.11646/zootaxa.5245.1.1, http://zenodo.org/record/7673309