Wilkinsonellus rugiscutum Liu & Polaszek 2025, sp. nov.

Wilkinsonellus rugiscutum Liu & Polaszek sp. nov. Fig. 5 Diagnosis. Body 3.7 mm long, bright yellow (Fig. 5 a); OOL: OD = 0.4 (Fig. 5 b); face wider dorsally (Fig. 5 e); antenna with 1 st and 2 nd flagellomeres equal in length and 2.6 × longer than wide (Fig. 5 a); mesoscutum with notauli; scutellar sulcus with six carinae inside (Fig. 5 b); scutellum with rugulose punctures, distinctly above level of propodeum with a spine apically in lateral view; propodeum 2.0 × wider than high, spiracles enclosed by costulae anteriorly and posteriorly (Fig. 5 d); mesopleuron with dense rugulose punctures except narrowly polished above sternaulus (Fig. 5 c); vein r 1.4 × 2 - SR (Fig. 5 f); metacoxa areolate-rugose on outer dorsal edge, with weaker sculpture laterally and ventrally (Fig. 5 c); petiole of T 1 strongly constricted medially, 12.5 × longer than medial width; T 2 trapezoid, smooth with shallow longitudinal grooves delimiting a median field that is indistinctly wider posteriorly; T 3 0.9 × as long as T 2 (Fig. 5 g); ovipositor sheath directed downwards (Fig. 5 c). Description. Female. Body length 3.7 mm, fore wing length 3.8 mm (Fig. 5 a). Head. 2.0 × as wide as long, 1.2 × slightly wider than mesoscutum. Eyes 4.6 × longer than temple in dorsal view. Temple dull, with dense punctures, strongly constricted behind eyes in dorsal view. Vertex with shallow punctures excluding foveate areas along outside edge of posterior ocelli, a shallow depression present behind ocelli. Ocelli large, distance between fore and a posterior ocellus 0.4 × as long as minor axis of a posterior ocellus, POL: OD: OOL = 1.0: 2.3: 1.0. Frons slightly depressed, nearly polished (Fig. 5 b). Face little shiny, indistinctly bulging medio-longitudinally, 0.8 × as wide as high, with dense punctures, their intervals uneven. Clypeus 2.3 × wider than medial length, nearly smooth. Length of malar space as long as width of mandible (Fig. 5 e). Antenna with 1 st and 2 nd flagellomeres equal in length and 2.6 × longer than wide, three apical flagellomeres missing (Fig. 5 a). Mesosoma. Length: width: height = 1.8: 1.2: 1.0. Mesoscutum dull with dense punctures, notauli indicated by slightly rugose punctures, intervals narrow, ridge-like. Scutellar sulcus wide and straight with six carinae inside (Fig. 5 b). Scutellum dull, with rugulose punctures, distinctly above level of propodeum with a spine apically in lateral view (Fig. 5 b, c). Propodeum 2.0 × wider than high, a little shiny with strong percurrent medio-longitudinal carina and adjacent oblique carinae with thinner carinae at sides; spiracles large, enclosed by costulae anteriorly and posteriorly (Fig. 5 d). Mesopleuron not shiny, with dense rugulose punctures except narrowly polished above sternaulus, the latter weakly crenulated and with an oblique furrow attaching right-angled to its anterior end (Fig. 5 c). Wings. Fore wing: pterostigma narrow, 3.6 × as long as its widest part; vein 1 - R 1 1.2 × length of pterostigma; vein r arising from apical third of pterostigma, 1.4 × longer than maximum width of pterostigma, 1.4 × 2 - SR; vein m-cu 0.7 × as long as 2 - SR + M, about half of 2 - SR; vein 1 - CU 1 0.3 × 2 - CU 1 and as long as cu-a (Fig. 5 f). Hind wing: vannal lobe of normal size, posterior margin with short setae medially, basal and apical with longer setae, cu-a nearly straight. Legs. Metacoxa just surpassing T 3, areolate-rugose on outer dorsal edge, with weaker sculpture laterally and ventrally (Fig. 5 c). Metafemur 3.5 × as long as its widest part. Inner spur of metatibia 4 / 5 length of metabasitarsus. Metabasitarsus 0.8 × as long as combined length of tarsomeres 2–5 (Fig. 5 a, c). Metasoma. Nearly as long as length of mesosoma. Petiole of T 1 smooth, strongly constricted medially, 2.7 × longer than basal width, 12.5 × longer than medial width, petiole with a groove reaching to anterior half of apical swollen area. T 2 trapezoidal, smooth, with shallow, longitudinal grooves delimiting a median field that is indistinctly widened posteriorly, 1.3 × as wide as length in the middle. T 3 0.9 × as long as T 2, T 3, and posterior tergites smooth and softer (Fig. 5 g). Hypopygium somewhat broad, hardly exceeding apex of metasoma. Ovipositor sheath slightly protruding beyond metasoma, pointing downwards, almost glabrous (Fig. 5 c). Colour. Body bright yellow (Fig. 5 a). Palpi white. Tibia spurs pale yellow. Antenna yellow-brown to dark brown. Fore and middle legs light yellow, hind leg yellow except black on macula of apical coxa, apical 2 / 5 of metafemur, apical 1 / 3 of metatibia and dark brown to yellow-brown on metatarsus. Wing membranes hyaline, indistinctly infumate, fore wing with pterostigma brown, veins pale brown to brown. Male. Unknown Host. Unknown. Material examined. (NHMUK) Holotype • 1 ♀; Malaysia, Selangor, Serdang Carambola Farm; xi. 1979; Gauld, Khashiyah; NHMUK 010826369. Distribution. Malaysia (Selangor). Etymology. The specific name rugiscutum derives from the Latin “ rugosus ” and “ scutum ”, referring to the rugose punctate mesoscutum. Remarks. This species is similar to W. longicentrus, but differs in the following: fore wing with vein 1 - CU 1 shorter, 0.3 × 2 - CU 1 (1 - CU 1 longer, over half length of 2 - CU 1 in W. longicentrus); POL shorter, less than half length of OD (POL longer, nearly as long as OD in W. longicentrus); and petiole of T 1 longer, 12.5 × longer than medial width (petiole shorter, at most 5 × longer than medial width in W. longicentrus). It also resembles W. amplus from the Oriental region being pale in colour, but it can be easily differentiated from the latter by the black maculae on the apical metacoxa, and hind leg with less rugosity on lateral-dorsal part of metacoxa.