Mesochorus (Mesochorus) malaysiacus, Riedel, 2023

Riedel, Matthias, 2023, Contribution to the taxonomy of the Southeast Asian Mesochorinae (Hymenoptera, Ichneumonidae), Zootaxa 5245 (1), pp. 1-72 : 21-22

publication ID

https://doi.org/ 10.11646/zootaxa.5245.1.1

publication LSID

lsid:zoobank.org:pub:7015E475-56A7-4AF1-8964-A167C672A234

DOI

https://doi.org/10.5281/zenodo.7675033

persistent identifier

https://treatment.plazi.org/id/B20D813A-D433-FFBF-FF51-F901FAD627CA

treatment provided by

Plazi

scientific name

Mesochorus (Mesochorus) malaysiacus
status

sp. nov.

Mesochorus (Mesochorus) malaysiacus nov. sp.

( Figs 4A View FIGURE 4 , 10F View FIGURE 10 , 18D View FIGURE 18 , 23B View FIGURE 23 )

Holotype. (♀) Malaysia: SE Sabah, nr Danum Valley Field C, c. 150 m, WONO, Mal. trap 5, 26.v. –20.vi.1987, RMNH´87, C. v. Achterberg & D. Kennedy (Leiden).

Description. ♀: Body length 3.7 mm. Fore wing 3.5 mm.

Head. Flagellum with 25 flagellomeres; 1 st flagellomere 6.1 × longer than wide and 1.5 × longer than 2 nd flagellomere, 0.6 × as long as eye; 2 nd flagellomere 3.9 × longer than wide; preapical flagellomere 2.8 × longer than wide. Temple strongly and roundly narrowed behind eye, dorsally c 0.3 × as long as eye. OED 1.6 × and OOD 0.5 × ocellar diameter. Occipital carina complete medially. Frons almost smooth medially, with few punctures and fine transverse striation laterally. Face ( Fig. 10F View FIGURE 10 ) densely punctate, without central longitudinal ridge dorsally, width 1.0 × combined length of face and clypeus and 1.0 × eye length; inner eye margins parallel. Subantennal transverse carina dipped medially. Malar space and facial orbit widely and coarsely striate. Malar space 1.0 × 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 . 1.6 × longer than high, covered with whitish setae. Mesoscutum densely punctate, partly rugosepunctate postero-medially. Scuto-scutellar groove smooth. Scutellum moderately convex, without lateral carina, not pointed apically. Mesopleuron with rather dense punctures fronto-dorsally and with coarse but sparse punctures ventrally. Dorsal end of epicnemial carina separated from frontal margin of mesopleuron. Metapleuron with fine sparse punctures. Submetapleural carina low. Propodeum ( Fig. 18D View FIGURE 18 ) completely carinate. Area basalis trapezoid, shortly longer than wide. Area superomedia 1.9 × longer than wide and 1.0 × as long as area petiolaris; anterior transverse carina (costula) reaching at 4/10 of its length. Area petiolaris 1.4 × longer than wide. Hind femur 4.3 × longer than wide; hind metatarsus long, 0.5 × as long as hind tibia and 2.8 × longer than 2 nd hind tarsomere; hind claw with 2 short basal teeth. Areolet shortly sessile frontally; vein 2m-cu in its middle. Vein 1cu-a postfurcal by 0.5 × its length. Postnervulus intercepted basad its middle. Pterostigma 3.3 × longer than wide. Hind wing with 5 distal hamuli. Nervellus of hind wing slightly reclivous.

Metasoma. 1 st tergite rather stout, 2.2 × longer than wide. Postpetiolus smooth, with few rugae. 2 nd tergite 1.2 × wider than long. Thyridium comma-shaped. Ovipositor sheath ( Fig. 23B View FIGURE 23 ) with sparse setae, stick-shaped, 11.2 × longer than wide, 0.6 × as long as hind tibia and 1.1 × as long as hind metatarsus.

Color. Head reddish-yellow; palps, mandible except teeth, malar space and facial orbit pale yellow; stemmaticum blackish. Flagellum brownish; basal flagellomeres ochreous; scape and pedicel yellowish. Mesosoma reddishyellow; hind edge of pronotum and tegula cream-yellow. 1 st tergite reddish, yellow basally; postpetiolus with brownish stripes laterally. 2 nd tergite brown, with large yellowish spot with curved frontal margin in apical 2/3. 3 rd tergite brown; following tergites yellowish, dorsally ± with brownish spots. Ovipositor sheath pale brown. Fore and mid legs yellow; hind leg entirely reddish-yellow; hind tibia not infuscate. Pterostigma ochreous-hyaline.

♁ unknown.

Taxonomical remark. This new species belongs to the pectoralis group sensu Schwenke (1999), e. g. basal tergites black, mid tergites with pale color pattern, apical tergite ± darkened. It is characterized by: widely striate facial orbit, entirely yellowish mesosoma and hind tibia, and long and stick-shaped ovipositor sheath.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Ichneumonidae

Genus

Mesochorus

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