Pseudoplatylabus rufoniger, Riedel, 2023

Riedel, Matthias, 2023, Contribution to the knowledge of the Ichneumoninae (Hymenoptera, Ichneumonidae) from Maritime Southeast Asia, Zootaxa 5363 (1), pp. 1-94 : 80

Pseudoplatylabus rufoniger nov. sp.

( Figs 35A–D )

Holotypus. (♀) West Sumatra, Maninjau lake , 0°16´13.76 S 100°13´57.96 E, 19.xi.2015, leg. V. Gromenko (coll. Riedel) .

Etymology. The species name refers to the red and black metasoma.

Description. ♀. Body length 10.1 mm.

Head. Flagellum with 30 flagellomeres, slightly lanceolate; 1 st flagellomere 3.3 × longer than wide; 9 th flagellomere square; widest flagellomere 1.4 × wider than long. Head densely punctate. Temple long, dorsally 0.8 × as long as eye, slightly and roundly narrowed behind eye (fig. 35B). OED 2.2 × and OOD 1.7 × ocellar diameter. Frons and face rugose-punctate, dull. Clypeus almost flat, sides slightly bulging, moderately blade-like apically, with sparse punctures; apical margin thin, slightly concave (fig. 35A). Mandible with two teeth, lower tooth small and strongly bent inwards; mandible—seen from frontal—sickle-shaped. Malar space 1.5 × as long as width of mandibular base. Genal carina reaching mandibular base.

Mesosoma . Mesoscutum finely and densely punctate and granulate, dull. Side of pronotum rugose-punctate dorsally, coarse rugose ventrally. Mesopleuron and metapleuron densely rugose-punctate; speculum punctate; juxtacoxal carina present. Scutellum distinctly elevated and almost pyramidal, about as long as wide, coarsely punctate, with lateral carina in basal 0.8. Propodeum completely carinated (fig. 35C), spiracle slit-shaped. Area basalis and area superomedia confluent. Area basalis with median tubercle. Area superomedia hexagonal, 1.8 × longer than wide; costula reaching at its frontal 0.4. Apical transverse carina slightly lamelliform at outer edge of area dentipara, but without apophysis. Hind coxa densely punctate, with distinct scopa in its apico-ventral third. Hind femur 4.2 × longer than wide. Claws simple. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 3.0 × their width; vein 1cu-a slightly antefurcal by 1.0 × its width.

Metasoma. Oxypygous; 2 nd to 4 th sternites with median folds. Postpetiole moderately widened, without latero-median carina; median field not separated, finely granulate; lateral filed punctate. 2 nd tergite 1.1 × wider than long. Gastrocoelus strongly impressed, with some ridges. Thyridium transverse, 2.1 × wider than the interval between thyridia. 2 nd to 4 th tergites densely rugose-punctate and dull; 2 nd tergite finely striate between thyridia. Ovipositor sheath slightly reaching behind metasomal apex.

Colour. Black. Flagellum black, flagellomeres 7–10 with ivory rings. Hind edge of pronotum, collar and apical 2/3 of scutellum yellow. Mesopleuron red, black fronto-dorsally. Mesosternum, metapleuron and propodeum red. 1 st to 3 rd tergites red, following tergites black (fig. 35D). Fore and mid legs red; mid tibia externally and fore and mid tarsi entirely blackish; hind coxa red, diffusely brownish apically; hind trochanter red; hind femur, tibia, and tarsus black. Wings hyaline; pterostigma brown.

♂ unknown.

Distribution. Only known from Sumatra.

Figures

FIGURE 35. Pseudoplatylabus rufoniger n. sp. HT ♀. A face, frontal view, B head, dorsal view, C propodeum, dorsal view, D habitus, dorsal view.