Stenomacrus luteus Varga, 2024, sp. nov.
Creators: name: Varga, Oleksandr
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Stenomacrus
Stenomacrus luteus

description: Stenomacrus luteus sp. nov.
urn:lsid:zoobank.org:act: 10545C32-556D-43B1-A7BA-B8EF561D4B0B
Fig. 5
Diagnosis
Stenomacrus luteus sp. nov. is characterized by the combination of the following: face smooth (Fig. 5B); mesosoma yellow ventrally (Fig. 5A); antenna with 18 flagellomeres, first flagellomere 3.3 × as long as wide; temples 0.4 × the maximum diameter of eye in dorsal view, strongly narrowed (Fig. 5D); propodeum smooth, weakly wrinkled subapically, with only area apicalis partly delimited by carinae (Fig. 5E); fore wing with vein 2 rs-m about 0.8 × the distance between 2 rs-m and 2 m-cu; vein 3rs-m absent (Fig. 5F); first tergite 1.4 × as long as its apical width, longitudinally wrinkled, with latero-median longitudinal carinae hardly visible among wrinkles; second tergite 1.1 × as long as its apical width, sculptured on basal 0.3 (Fig. 5G); ovipositor sheath about 0.6 × as long as hind tibia (Fig. 5A).
Stenomacrus luteus sp. nov. differs from all known Afrotropical species in having a largely yellow mesosoma in combination with a smooth face and relatively short antenna.
Etymology
The new species is named after the relatively pale yellowish body colouration.
Type material
Holotype
KENYA • ♀; Eastern Prov., Mt Kulal Forest; 2.65400º N, 36.93660º E; 1810 m a.s.l.; 1 Nov. 2015 – 01 Apr. 2016; R. Copeland leg.; Malaise trap in disturbed forest; ICIPE.
Paratype
KENYA • 1 ♀; same data as for holotype; ICIPE.
Description
Female
Body length 2.5 mm. Fore wing 1.9 mm.
Head smooth and sparsely pubescent. Antenna with 18 flagellomeres, first flagellomere 3.3 × as long as wide. Face about 0.6 × as long as wide, smooth, sparsely pubescent; inner orbits parallel. Malar space 2.1 × basal width of mandible; subocular sulcus distinct. Clypeus 0.7 × as long as wide, smooth. Mandible bidentate, strongly bent outwards; lower tooth small and hardly visible. Temples 0.4 × maximum diameter of eye in dorsal view, strongly narrowed. Frons and vertex smooth; length of ocellar-ocular distance about as long as maximum diameter of lateral ocellus; occipital carina absent.
Propleuron sparsely pubescent. Pronotum smooth; epomia absent. Mesoscutum densely pubescent anteriorly; 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 smooth, weakly wrinkled apically, with only area apicalis partly delimited by carinae.
Legs relatively stout; hind femur 3.5 × 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 0.8 × 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, smooth, longitudinally wrinkled, with latero-median longitudinal carinae hardly visible among wrinkles; lateral oblique grooves distinct and deep. Second tergite 1.1 × as long as apical width, sculptured on basal 0.3, with weak basolateral grooves; thyridium round. Remaining part of metasoma smooth, laterally compressed. Ovipositor sheath about 0.6 × as long as hind tibia, apical part widened and pubescent.
Body generally brown dorsally and yellow ventrally: antenna, face narrowly below antennal sockets, mandible (except apices), mesosoma ventally, and legs yellow.
Male
Unknown.
Distribution
So far only known from Kenya.
description: Published as part of 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, pp. 177-202 in European Journal of Taxonomy 958 on pages 188-190, DOI: 10.5852/ejt.2024.958.2669, http://zenodo.org/record/13903208