Diadegma trochanteratum (Thomson, 1887)

Gadallah, Neveen S., Edmardash, Yusuf A., Mansour, Amany N. & Imam, Ahmed I., 2023, Parasitoid wasps (Ichneumonoidea) collected from faba bean fields, Kharga Oasis, New Valley, Egypt, with new records and the description of a new species, Zootaxa 5389 (5), pp. 501-544 : 525-529

Diadegma trochanteratum (Thomson, 1887)

Figs 16 (A–C), 17 (A–D)

Material examined: 1♀, Kharga Oasis [25°33’41.9”N 30°37’41.9”E], May, 2022, yellow pan trap in V. faba .

Redescription of female. Body generally black, with the mandible (except dark tip), labrum, palpi, tegula, trochanters (especially of fore and middle legs) are yellowish; fore femur, tibia and tarsus orange, middle femur dark red, middle tibia whitish with indistinct dark bands subbasally and apically; hind femur dark brown, hind tibia with conspicuous dark brown bands subbasally and apically; first four metasomal sternites whitish, with broad dark bands posteriorly; ovipositor and ovipositor sheath dark reddish brown. Fore wing with dark reddish pterostigma with pale base; rest of veins dark brown.

Head: with upper and lower faces densely finely granulate to puncticulate, with fine short whitish setae not obscuring integument behind; clypeus separated from face by slight linear depression, finely rugose, with slightly convex to straight apical margin, shinier than face above; labrum triangular, pointed medio-apically and distinctly upturned; mandible inwardly curved, with two equal teeth; maxillary palp 5-segmented, with slender segments; labial palp 4-segmented, segments robust; occipital carina present, complete; antenna with 27 antennomeres; head posteriorly nearly smooth (when seen in dorsal view), bare; ocellar triangle distinctly obtuse, POL about 1.8× OOL.

Mesosoma: mesoscutum finely rugose to granulate, scutellum finely punctate; scutellar sulcus crenulate; propodeum with area superomedia relatively long, irregularly transversely ridged posteriorly, separated from area petiolaris by a distinct angulation; area petiolaris widened posteriorly, transversely rugose; mesopleuron finely punctulate, with upper middle rounded shiny and smooth spot; transversely depressed medially. Fore wing with complete diamond-shaped areolet, shortly petiolate; vein 2m-cu intersecting vein M slightly after the middle; pterostigma 3.8× as long as its width, about 0.9× as long as vein R1; vein 1 RS ending before wing apex; vein cu-a slightly postfurcal.

Metasoma. Generally superficially, finely rugose; T 1 with postpetiole finely granulate; T 2 longer than wide, 1.3× as long as wide at apex, with fine short pale setae laterally, rest of tergites wholly setose, with short fine, pale setae; T 6 deeply roundly emarginate, T 7 in the form of two lobes that diverging basally, forming a rhomboid opening with T 6 emargination; S 1 starting at lower third ventral side of T 1; ovipositor long regularly and slightly upcurved to apex, with slight notching at apex dorsally; ovipositor sheath about as long as or slightly shorter than hind tibia.

Distribution in the MENA: Egypt (new record), Tunisia.

Comments: This species is a first record for the fauna of Egypt, it was formerly recorded from Tunisia ( Smits van Burgst 1913, 1918). Characters of this species largely agree with Horstmann’s key (1969: 426, couplet 79), however, it differs slightly from Horstmann’s description (1969: 456) in having trochanters I & II bright yellow, trochanter III black (in Horstmann 1969 all trochanters dull, I & II bright). It is also recorded here for the first time in association with V. faba .

Figures

FIGURE 16. Diadegma trochanteratum (Thomson, 1887) (♀): A, lateral habitus; B, frontal view of head; C, dorsal view of head.