Stenomacrus pronotalis, 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 : 190-192

Stenomacrus pronotalis sp. nov.

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Fig. 6

Diagnosis

Stenomacrus pronotalis sp. nov. is characterized by the combination of the following: face weakly granulate ( Fig. 6B ); antenna with 22 flagellomeres, first flagellomere 3.3 × as long as wide; temples 0.3 × the maximum diameter of eye in dorsal view, strongly narrowed ( Fig. 6D ); pronotum orange ( Fig. 6C ), epicnemial carina short ( Fig. 6E ); propodeum smooth, with only lateral longitudinal carina present apically ( Fig. 6G ); fore wing with vein 2 rs-m about 0.7 × the distance between 2 rs-m and 2 m-cu; vein 3rs-m absent ( Fig. 6F ); first tergite 1.4 × as long as its apical width, granulate, with with latero-median longitudinal carinae and longitudinal wrinkles present distally; second tergite about as long as its apical width, weakly sculptured on basal 0.1 ( Fig. 6G ); ovipositor sheath about 0.4 × as long as hind tibia ( Fig. 6A ).

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

Etymology

The new species is named after the distinctly paler pronotum in comparison to the rest of the mesosoma.

Type material

Holotype

KENYA • ♀; Western Prov., Kakamega Forest ; 0.23742° N, 34.86607° E; 1620 m a.s.l.; 19 Apr.–2 May 2017; R. Copeland leg.; nr KFS HDQTRs, Malaise trap in indigenous forest; ICIPE.

Description

Female (holotype)

Body length 3.5 mm. Fore wing 2.6 mm.

Head smooth and sparsely pubescent. Antenna with 22 flagellomeres, first flagellomere 3.3 × as long as wide. Face about 0.6 × as long as wide, weakly granulate; inner orbits weakly divergent ventrally. Malar space 2.1 × basal width of mandible; subocular sulcus distinct. Clypeus 0.7 × as long as wide, weakly convex. Mandible bidentate, strongly bent outwards; lower tooth small and hardly visible. Temples 0.3 × maximum diameter of eye in dorsal view, strongly 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 smooth; 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, but short. Metapleuron smooth; pleural and submetapleural carinae present. Propodeum weakly granulate, with only lateral longitudinal carina present apically.

Legs relatively slender; hind femur 4.0 × as long as wide, third tarsomere of hind tarsus about 0.9 × length of fifth tarsomere; tarsal claws simple.

Fore wing with vein 2 rs-m about 0.7 × 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 1.4 × as long as apical width, weakly longitudinally wrinkled on granulate background, with latero-median longitudinal carinae distinct distally; lateral oblique grooves distinct and deep. Second tergite about as long as apical width, weakly sculptured on basal 0.1 of tergite, with weak basolateral grooves; thyridium elongate. Remaining part of metasoma smooth, weakly laterally compressed from third tergite. Ovipositor sheath about 0.4 × as long as hind tibia, apical part widened and pubescent.

Body generally brownish except antenna basally, mandible (except apices), propleuron, pronotum, and legs yellowish-red.

Male

Unknown.

Distribution

So far only known from Kenya.

Figures

Fig. 6. Stenomacrus pronotalis 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. Frontal view of epicnemium. Red arrow indicates a relatively short epicnemial carina.F. Wings. G. Dorsal view of propodeum and metasomal tergites 1–2. Scale bars: A = 0.5 mm; B–G = 0.1 mm.