Stenomacrus vuriaensis, 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 : 198-200

Stenomacrus vuriaensis sp. nov.

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Fig. 9

Diagnosis

Stenomacrus vuriaensis sp. nov. is characterized by the combination of the following: face weakly granulate ( Fig. 9B ); antenna with 20–21 flagellomeres, first flagellomere 2.9–3.3 × as long as wide; temples 0.4 × the maximum diameter of eye in dorsal view, strongly narrowed ( Fig. 9D ); propodeum weakly granulate apically, with area apicalis narrowly interrupted centrally ( Fig. 9D ); fore wing with vein 2 rs-m about 0.9 × the distance between 2 rs-m and 2 m-cu; vein 3rs-m absent ( Fig. 9E ); first tergite 1.8–2.0 × as long as its apical width, granulate, with latero-median longitudinal carinae indistinct; second tergite about 1.4–1.6 × as long as its apical width, with only traces of granulation on basal 0.2 of the tergite ( Fig. 9F ); ovipositor sheath about 0.6 × as long as hind tibia ( Fig. 9A ).

Stenomacrus vuriaensis sp. nov. is similar to S. pronotalis sp. nov. but differs in the longer and more strongly sculptured first metasomal tergite, 1.9–2.0 × as long as its apical width (1.4 × in S. pronotalis ), and darker pronotum, with at most some yellow marks distally (distinctly paler than the rest of the mesosoma in S. pronotalis ).

Etymology

The new species is named after the type locality, Vuria Forest.

Type material

Holotype

KENYA • ♀; Coast Prov., Taita Hills , Vuria Forest ; 3.41428° S, 38.29178° E; 2162 m a.s.l.; 19 Sep.–3 Oct. 2012; R. Copeland leg.; Malaise trap, just inside indigenous forest; ICIPE.

Paratypes

KENYA • 1 ♀; same data as for holotype; 5–19 Apr. 2012; ICIPE • 2 ♀♀; same data as for holotype; 14–28 Oct. 2011; ICIPE .

Description

Female

Body length 3.5–3.6 mm. Fore wing 2.8–2.9 mm.

Head smooth and sparsely pubescent. Antenna with 20–21 flagellomeres, first flagellomere 2.9–3.3 × as long as wide. Face about 0.6 × as long as wide, weakly granulate; inner orbits weakly divergent ventrally. Malar space 2.8 × basal width of mandible; subocular sulcus distinct. Clypeus 0.5 × as long as wide, weakly convex centrally. Mandible bidentate, strongly bent outwards; lower tooth small, but clearly visible. Temples 0.4 × maximum diameter of eye in dorsal view, strongly narrowed. Frons and vertex smooth; length of ocellar-ocular distance about 1.0 × maximum diameter of lateral ocellus; occipital carina absent.

Propleuron sparsely pubescent. Pronotum smooth, wrinkled distally; epomia absent. Mesoscutum more-or-less evenly densely pubescent; notauli absent. Scutellum densely 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 apically, with area apicalis narrowly interrupted centrally.

Legs relatively stout; hind femur 3.7 × 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 0.9 × distance between 2 rs-m and 2 m-cu; vein 3rs-m absent; vein 1cu-a weakly basad to weakly distad M & Rs; hind wing with nervellus not intercepted, strongly reclivous.

Metasoma with first tergite 1.8–2.0 × as long as apical width, granulate, with latero-median longitudinal carinae indistinct; lateral oblique grooves distinct and deep. Second tergite about 1.4–1.6 × as long as apical width, with only traces of granulation on basal 0.2 of tergite; basolateral grooves distinct; thyridium round. Remaining part of metasoma smooth, weakly laterally compressed. Ovipositor sheath about 0.6 × as long as hind tibia, apical part widened and pubescent.

Body generally brownish except scape and pedicel, face narrowly below antennal sockets, mandible (except apices), and pronotum distally narrowly yellow. Legs generally reddish-yellow to reddishbrown.

Male

Unknown.

Distribution

So far only known from Kenya.

Figures

Fig. 9. Stenomacrus vuriaensis 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 mesosoma. E. Wings. F. Dorsal view of metasomal tergites 1–2. Scale bars: A = 0.5 mm; B–F = 0.1 mm.