Stenomacrus scutellaris, 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 : 193-195

Stenomacrus scutellaris sp. nov.

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Fig. 7

Diagnosis

Stenomacrus scutellaris sp. nov. is characterized by the combination of the following: face smooth ( Fig. 7B ); antenna with 19–20 flagellomeres, first flagellomere 2.4–2.6 × as long as wide; temples 0.5 × the maximum diameter of eye in dorsal view, strongly narrowed ( Fig. 7F ); mesosoma compressed laterally, scutellum basally arched ( Fig. 7D ); propodeum smooth, weakly wrinkled subapically, with only area apicalis delimited by carinae laterally ( Fig. 7D ); fore wing with vein 2 rs-m about 0.9× distance between 2 rs-m and 2 m-cu; vein 3rs-m absent ( Fig. 7E ); first tergite 2.8 × as long as its apical width, smooth, longitudinally wrinkled, with latero-median longitudinal carinae hardly visible among wrinkles ( Fig. 7G ); second tergite 2.0 × as long as its apical width, weakly sculptured on basal 0.3 ( Fig. 7H ); ovipositor sheath about 0.6 × as long as hind tibia ( Fig. 7A ).

Stenomacrus scutellaris sp. nov. is similar to S. clypeatus sp. nov. but has a smooth face (aciculate in S. clypeatus ) with flat a clypeus, not separated from the face (swollen, distinctly separated in S. clypeatus ); laterally compressed mesosoma (not compressed in S. clypeatus ); and a more weakly sculptured second metasomal tergite.

Etymology

The new species is named after the characteristic scutellum.

Type material

Holotype

KENYA • ♀; Eastern Prov., Mt Kulal Forest ; 2.65400º N, 36.93660º E; 1810 m a.s.l.; 1 Nov. 2015 – 1 Apr. 2016; R. Copeland leg.; Malaise trap in disturbed forest; ICIPE.

Paratypes

KENYA • 2 ♀♀; same data as for holotype; ICIPE • 1 ♀; Coast Prov., Taita Hills , Vuria Forest ; 3.41428° S, 38.29178° E; 2162 m a.s.l.; 28 Dec. 2011 – 10 Jan. 2012; R. Copeland leg.; Malaise trap, just inside indigenous forest; ICIPE .

Description

Female

Body length 4.0– 4.1 mm. Fore wing 2.8–2.9 mm.

Head smooth and sparsely pubescent. Antenna with 19–20 flagellomeres, first flagellomere 2.4–2.6 × as long as wide. Face about 0.8 × as long as wide, smooth, sparsely pubescent; inner orbits parallel. Malar space 2.9 × basal width of mandible; subocular sulcus distinct. Clypeus 0.5 × as long as wide, smooth. Mandible bidentate, strongly bent outwards; lower tooth small and hardly visible. Temples 0.5 × maximum diameter of eye in dorsal view, strongly narrowed. Frons and vertex smooth; length of ocellar-ocular distance about 1.2 × maximum diameter of lateral ocellus; occipital carina absent.

Mesosoma strongly compressed laterally. Propleuron sparsely pubescent. Pronotum smooth, with short longitudinal wrinkles at posterior edge; epomia absent. Mesoscutum elongate, densely pubescent anteriorly, sparsely pubescent posteriorly; notauli absent. Scutellum densely pubescent, with carinae present only on basal 0.1; scutellum basally arched. Mesopleuron smooth; epicnemial carina present laterally. Metapleuron smooth; pleural and submetapleural carinae present. Propodeum smooth, weakly wrinkled subapically, with area apicalis interrupted centrally.

Legs relatively stout; hind femur 3.2 × as long as wide, third tarsomere of hind tarsus about 1.1 × length of 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 opposite M & Rs; hind wing with nervellus not intercepted, reclivous.

Metasoma with first tergite 2.8 × as long as apical width, smooth, longitudinally wrinkled, with latero-median longitudinal carinae hardly visible among wrinkles; lateral oblique grooves distinct but weak. Second tergite 1.6–2.0 × as long as apical width, sculptured on basal 0.3, with distinct basolateral grooves; thyridium round. Remaining part of metasoma smooth, less compressed laterally than previous tergites. 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), fore and mid legs, hind trochanter and trochantellus yellow. Remaining part of hind leg red with darker stripes dorsally.

Male

Unknown.

Distribution

So far only known from Kenya.

Figures

Fig. 7. Stenomacrus scutellaris 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 mesosoma. Red arrow indicates basally arched scutellum. E. Wings. F. Dorsal view of head. G. Dorsal view of first metasomal tergite. H. Dorsal view of second metasomal tergite. Scale bars: A = 0.5 mm; B–H = 0.1 mm.