Stenomacrus glabratus, Varga, 2024

Varga, Oleksandr, 2024, Review of the genus Stenomacrus Förster, 1869 (Hymenoptera: Ichneumonidae: Orthocentrinae) from Kenya and Burundi: a first step to understanding the diversity of the genus in the Afrotropics, European Journal of Taxonomy 958, pp. 177-202 : 185-188

Stenomacrus glabratus sp. nov.

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Fig. 4

Diagnosis

Stenomacrus glabratus sp. nov. is characterized by the combination of the following: antenna with 25– 27 flagellomeres, first flagellomere 1.9 × as long as wide; temples 0.7 × the maximum diameter of eye in dorsal view, weakly narrowed ( Fig. 4D ); pronotum longitudinally wrinkled ( Fig. 4C ); propodeum with apical transverse, lateral and lateromedian longitudinal carinae present ( Fig. 4F ); fore wing with vein 2 rs-m about 0.6 × the distance between 2 rs-m and 2 m-cu; vein 3rs-m absent ( Fig. 4E ); first tergite 1.3 × as long as its apical width, smooth and shiny, with latero-median longitudinal carinae and longitudinal wrinkles visible only subapically on lateral oblique grooves; second tergite 0.9 × as long as its apical width, weakly sculptured on basal 0.1 of the tergite ( Fig. 4F ); ovipositor sheath about 0.6 × as long as hind tibia ( Fig. 4A ).

Stenomacrus glabratus sp. nov. differs from all known Afrotropical species in having a developed carination of the propodeum in combination with long and weakly narrowed temples in dorsal view, and weakly sculptured metasomal tergites 1–2.

Etymology

The new species is named after the smooth and shiny metasomal tergites 1–2.

Type material

Holotype

KENYA • ♀; Eastern Prov., Nyambene Hills , Itieni Forest , 0.24433° N, 37.87016° E; 2142 m a.s.l.; 10–24 July 2011; R. Copeland leg.; at bottom, Malaise trap, edge of indigenous forest, nr. forest station; ICIPE.

Paratype

KENYA • 1 ♀; same data as for holotype; 7–21 Aug. 2011; ICIPE .

Other material examined

KENYA • 1 ♀; Coast Prov., Taita Hills , Ngangao Forest ; 3.36100º S, 38.34186º E; 1848 m a.s.l.; 10–24 Jan. 2012; R. Copeland leg.; Malaise trap, indigenous forest; ICIPE .

Description

Female

Body length 4.7–4.8 mm. Fore wing 3.5–3.6 mm.

Head smooth and sparsely pubescent. Antenna with 25–27 flagellomeres, first flagellomere 1.9 × as long as wide. Face about 0.5 × as long as wide, indistinctly sculptured, shiny; inner orbits weakly divergent ventrally. Malar space 3.0 × basal width of mandible; subocular sulcus distinct. Clypeus 0.6 × as long as wide, flat. Mandible bidentate, strongly bent outwards; lower tooth small and hardly visible. Temples 0.7 × maximum diameter of eye in dorsal view, weakly narrowed. Frons and vertex smooth; length of ocellar-ocular distance about 0.9 × maximum diameter of lateral ocellus; occipital carina absent.

Propleuron sparsely pubescent. Pronotum longitudinally wrinkled; epomia absent. Mesoscutum densely pubescent anteriorly and sparsely pubescent posteriorly; notauli absent. Scutellum sparsely pubescent, with carinae present only on basal 0.1. Mesopleuron smooth; epicnemial carina present laterally. Metapleuron smooth; pleural and submetapleural carinae present. Propodeum weakly granulate posteriorly, with apical transverse, lateral and lateromedian longitudinal carinae present.

Legs relatively stout; hind femur 3.1 × as long as wide, third tarsomere of hind tarsus about as long as fifth tarsomere; tarsal claws simple.

Fore wing with vein 2 rs-m about 0.6 × distance between 2 rs-m and 2 m-cu; vein 3rs-m absent; vein 1cu-a opposite M & Rs; hind wing with nervellus not intercepted, reclivous.

Metasoma with first tergite 1.3× as long as apical width, smooth and shiny, with latero-median longitudinal carinae and longitudinal wrinkles visible only subapically on lateral oblique grooves. Second tergite 0.9 × as long as apical width, weakly sculptured on basal 0.1 of tergite, with weak basolateral grooves; thyridium round. Remaining part of metasoma smooth, weakly laterally compressed from third tergite. Ovipositor sheath about 0.6 × as long as hind tibia, apical part widened and pubescent.

Body generally brownish-black except scape and mandible (except apices) yellow. Fore and mid legs reddish except femora weakly darker. Hind legs red-brownish, hind tibia and tarsus darker dorsally.

Male

Unknown.

Remarks

The female from Ngangao Forest has 27 flagellomeres and is similar in habitus to the holotype, but has a paler antenna, an unsculptured pronotum (with only traces of wrinkles) and a more strongly sculptured first tergite: wrinkles extend to the apex of the tergite. This specimen could represent a separate species, thus I do not include it in the type series.

Distribution

So far only known from Kenya.

Figures

Fig. 4. Stenomacrus glabratus sp. nov., holotype, ♀ (ICIPE). A. Lateral view of habitus. B. Frontal view of face. C. Lateral view of head and mesosoma. D. Dorsal view of head and mesoscutum. E. Wings. F. Dorsal view of propodeum and metasomal tergites 1–2. Scale bars: A = 0.5 mm; B–F = 0.1 mm.