Stenomacrus clypeatus, 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 : 180-182

Stenomacrus clypeatus sp. nov.

urn:lsid:zoobank.org:act:4C7E254C-9617-4558-9A90-AFBDAC59587F

Fig. 2

Diagnosis

Stenomacrus clypeatus sp. nov. is characterized by the combination of the following: face aciculate; clypeus relatively convex, distinctly separated from face, yellow ( Fig. 2A ); antenna with 27 flagellomeres, first flagellomere 3.5 × as long as wide; temples 0.6 × maximum diameter of eye in dorsal view, strongly narrowed ( Fig. 2D ); propodeum smooth, with only lateral longitudinal carina present apically ( Fig. 2F ); fore wing with vein 2 rs-m about 0.7 × the distance between 2 rs-m and 2 m-cu; vein 3rs-m absent; hind wing with nervellus vertical ( Fig. 2E ); first tergite 2.3 × as long as its apical width, longitudinally wrinkled; second tergite 1.6 × as long as its apical width, distinctly longitudinally wrinkled on basal 0.7 ( Fig. 2F ); ovipositor sheath about 0.6 × as long as hind tibia ( Fig. 2A ).

Stenomacrus clypeatus sp. nov. differs from all known Afrotropical species in the elongate and strongly wrinkled metasomal tergites 1–2 in combination with a convex clypeus. The shape of the clypeus indicates that this species potentially belongs to the genus Chilocyrtus , but the mandibles are closed and thus it is not possible to acertain the presence / absence or the shape of the lower tooth.

Etymology

The new species is named after the diagnostic clypeus.

Type material

Holotype

BURUNDI • ♀; Kibira National Park ; 2.93315° S, 29.50583° E; 2177 m a.s.l.; 29 Jan.–12 Feb. 2010; R. Copeland leg.; mixed forest, Malaise trap, bamboo near small meadow; MRAC.

Description

Female (holotype)

Body length 5.7 mm. Fore wing 3.2 mm.

Head smooth and sparsely pubescent. Antenna with 27 flagellomeres, first flagellomere 3.5 × as long as wide. Face about 0.5 × as long as wide, weakly aciculate, densely pubescent; inner orbits weakly divergent ventrally. Malar space 1.6 × basal width of mandible; subocular sulcus distinct. Clypeus 0.6 × as long as wide, convex, distinctly separated from face. Mandibular teeth not visible due to mandible position. Temples 0.6 × maximum diameter of eye in dorsal view, strongly narrowed. Frons and vertex smooth; length of ocellar-ocular distance about 1.1 × the maximum diameter of lateral ocellus; occipital carina absent.

Propleuron sparsely pubescent. Pronotum smooth; epomia absent. Mesoscutum 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 smooth, with only lateral longitudinal carina present apically.

Legs relatively stout; hind femur 3.2 × 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 0.7 × distance between 2 rs-m and 2 m-cu; vein 3rs-m absent; vein 1cu-a weakly basad to M & Rs; hind wing with nervellus not intercepted, vertical.

Metasoma with first tergite 2.3 × as long as its apical width, longitudinally wrinkled; carinae hardly visible among wrinkles; lateral oblique grooves present but weak. Second tergite 1.6 × as long as apical width, distinctly longitudinally wrinkled on basal 0.7 of tergite, with deep and long basolateral grooves; thyridium round. Remaining part of metasoma smooth, laterally compressed from third tergite. Ovipositor sheath about 0.6 × as long as hind tibia, apical part widened and pubescent.

Body brown except antenna ventrally, face narrowly below antennal sockets continuing on frons, clypeus largely, mandible (except apices), propleuron, pronotum partly, and fore and mid legs yellow. Hind coxa brown, hind femur, tibia and tarsus reddish, fuscous dorsally.

Male

Unknown.

Distribution

So far only known from Burundi.

Figures

Fig. 2. Stenomacrus clypeatus, sp. nov., holotype, ♀ (MRAC). 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.