Platycampus rufitegularis Liu & Wei, 2025

Liu, Meng-Meng, Li, Ze-Jian & Wei, Mei-Cai, 2025, A new species of Platycampus (Hymenoptera, Tenthredinidae) from China, with an identification key to the world species, Journal of Hymenoptera Research 98, pp. 897-914 : 897-914

Platycampus rufitegularis Liu & Wei sp. nov.

Figs 1 , 2 , 3

Material examined.

Holotype, • female, China: Zhejiang Province, Hangzhou City, Lin’an District, Mt. West Tianmu, Xianrending , 30.349°N, 119.424°E, 1506 m, 9 May 2021, leg. Zejian Li . Paratypes, • 4 females, China: Zhejiang Province, Hangzhou City, Lin’an District, Mt. West Tianmu, Xianrending , 30.349°N, 119.424°E, 1506 m, 9 May 2021, leg. Zejian Li ; • 1 female, China: Zhejiang Province, Hangzhou City, Lin’an District, Mt. West Tianmu , 1506 m, 5 June 2012, malaise trap ; • 1 female, China: Zhejiang Province, Hangzhou City, Lin’an District, Mt. West Tianmu , 1100–1500 m, 5–6 May 2017, leg. Wenxuan Bi ; • 1 male, China: Zhejiang Province, Hangzhou City, Lin’an District, Mt. West Tianmu, Xianrending , 30.350°N, 119.424°E, 1506 m, 3 May 2019, leg. Zejian Li ; • 1 male, China: Zhejiang Province, Hangzhou City, Lin’an District, Mt. West Tianmu, Kaishanlaodian , 30.323°N, 119.433°E, 1106 m, 28–29 April 2017, leg. Zejian Li, Mengmeng Liu, Kaiwen Gao & Tingting Ji . • 5 females (in alcohol), China: Zhejiang Province, Hangzhou City, Lin’an District, Mt. West Tianmu , 1506 m, 9 May 2021, leg. Zejian Li . Voucher specimens: LSAF-M 0126 – M 0130, mitochondrial genome sequencing was performed on LSAF-M 0126 .

Diagnosis.

Body black; legs yellowish-white to reddish-brown; tegula reddish-brown (Fig. 1 ); anterior margin of clypeus incised to 0.25 × length of clypeus, lateral corners rounded; malar space 1.5 × as long as diameter of median ocellus (Fig. 2 B ); middle fovea subcircular and slightly shallow, with a fine longitudinal groove at bottom extending to the frons; frontal area with a median longitudinal groove (Fig. 2 A ); relative length of antennomere 3: antennomere 4: antennomere 5 = 1: 1.1: 1 (Fig. 2 C ); median mesoscutal groove of mesonotum shallow and thin, extending to the apex (Fig. 2 D ); lower part of mesepisternum with glabrous area (Fig. 2 E ); protarsomere 1 0.8 × as long as combined length of tarsomeres 2–4; hind tibia 1.2 × as long as hind tarsus; tarsal claw with inner tooth slightly shorter than outer tooth; valvula 3 about as long as valvifer 2 (Fig. 2 F ); lancet with 15 serrulae; annular suture 1 straight, sutures 1–9 with setae bands, longest setal band about 0.2 times as long as the length of annulus (Fig. 3 A, B ); tangium narrow and 4.1 × as long as annulus 1, radix 0.5 × as long as lamnium, the basal angle slightly acute (Fig. 3 C ); harpes inner surface swollen over basal third, apical width 0.3 × basal width (Fig. 3 D ); penis valve with narrow lobiform process slightly shorter than broad lobiform process, both processes dorsally inclined; broad lobiform process gradually narrowing from midlength toward apex, lateral margins converging at 145 °; basal interval between processes 0.5 × basal width of narrow lobiform process (Fig. 3 E ).

Description.

Holotype, female. Body length approximately 6.5 mm (Fig. 1 A, B ).

Color. Body black. All legs yellowish-white to reddish-brown except for a small black area at the base of all coxae; labrum dusky brown; maxillary palps yellowish-brown; tegula reddish-brown; cenchrus pale white. Wings hyaline, basal part of vein C in the forewing yellowish-brown; stigma and veins brown to blackish-brown (Fig. 1 A, B ).

Head. Labrum nearly flat, apex rounded; clypeus broad, distinctly narrower than the distance at the lower margins of eyes; anterior margin of clypeus incised to 0.25 × length of clypeus, lateral corners rounded; labrum shiny, punctures faint and sparse, microsculpture indistinct; clypeus shiny, punctures fine, apically very sparse and basally slightly denser, microsculpture indistinct. Malar space 1.4 × as long as diameter of median ocellus. Inner margins of eyes subparallel in frontal view, distance between eyes 1.9 × as long as height of eyes (Fig. 2 B ). In dorsal view, inner margins of eyes subparallel, the length of temple 0.3 × as long as length of eyes; middle fovea subcircular and slightly shallow, with a fine longitudinal groove at bottom extending to the frons. Frontal area slightly convex, with a median longitudinal groove, shiny, punctures small and slightly sparse, wrinkles distinct; anterior wall elevated, notched medially, lateral walls low and blunt. Interocellar furrow very broad and shallow, postocellar furrow narrow and shallow; circumocellar furrow indistinct; POL: OOL: OCL = 1.2: 1.2: 1.0 (Fig. 2 A ). Vertex and postocellar area strongly shiny, punctures small and sparse, without microsculpture; postocellar area convex, middle furrow indistinct, approx. 2.4 × as wide as long, lateral postocellar furrows narrow and deep, divergent backward distinctly (Fig. 2 A ). Antenna filamentous, slightly shorter than thorax and abdomen together, antennomere 3 slightly compressed; relative length of antennomere 3: antennomere 4: antennomere 5 = 1: 1.1: 1 (Fig. 2 C ).

Thorax. Mesonotum shiny, punctures small and slightly dense, microsculpture indistinct; median mesoscutal groove shallow and thin, extending to the apex; mesoscutellum and mesoscutellar appendage smooth and shiny, with some faint punctures, without microsculpture, mesoscutellum flat, middle ridge indistinct, the length 1.1 × as long as wide; mesoscutellar appendage about 0.3 × length of scutellum, without middle ridge (Fig. 2 D ). Distance between cenchri about 0.9 × as long as breadth of a cenchrus (Fig. 2 D ). Mesepisternum shiny, with fine and slightly dense punctures, without microsculpture, lower part with glabrous area; mesepimeron smooth and shiny, punctures indistinct, posterior part with microsculpture; metapleuron smooth and shiny, posterior part of metepisternum with some fine punctures, posterior part of metepimeron with microsculpture (Fig. 2 E ). Subbase of vein M in the forewings curved, significantly longer than vein R + M, cross-vein cu-a joining cell 1 M at basal 0.5, cell 2 Rs 2.2 × as long as cell 1 R 1, vein Rs vestigial; petiole of anal cell of hindwing 1.7 × as long as cu-a, and cu-a straight.

Abdomen. All abdominal terga shiny, with small and sparse punctures, microsculpture fine and dense, with some wrinkles. Ovipositor sheath shiny, with small and sparse punctures, microsculpture faint; sheath 1.6 × as long as metatarsomere 1 and 1.1 × as long as front tibia, valvula 3 about as long as valvifer 2; in lateral view, posterior margin of valvula 3 slightly rounded (Fig. 2 F ); in dorsal view, valvula 3 tapering toward the apex; cercus slightly tapering apically, longer than valvula 3, 6 × as long as wide. Sawsheath setae moderately curved, angle between most lateral setae of valvula 3 about 60 ° (Fig. 2 G ). Lancet with 15 serrulae, proximal denticles indistinct, each middle serrula with 3–4 distal denticles, cypsellae with arcuate emargination (Fig. 3 A, B ); annular suture 1 straight, sutures 1–9 with setae bands, longest setal band about 0.2 times as long as the length of annulus; tangium narrow and 4.1 × as long as annulus 1, radix 0.5 × as long as lamnium, the basal angle slightly acute, dorsal margin nearly flat (Fig. 3 A, C ).

Legs. Protarsomere 1 0.8 × as long as combined length of tarsomeres 2–4; hind tibia 1.2 × as long as hind tarsus, inner apical spur of hind tibia 0.5 × as long as metatarsomere 1, metatarsomere 1 0.8 × as long as combined length of metatarsomeres 2–5; tarsal claw with inner tooth slightly shorter than outer tooth.

Male. Body length approximately 5.5 mm. Body color and structure similar to the female except for following characters (Fig. 1 C, D ): posterior margin of pronotum yellowish-brown; antennal flagellum ventrally dark brown, flagellomere 3 distinctly laterally compressed and flagellomeres 4–5 slightly compressed; cercus short, 2.5 × as long as wide; the 8 tergum without procidentia (Fig. 2 H ); gonoforceps as shown in Fig. 3 D , harpes inner surface swollen over basal third, apical width 0.3 × basal width; penis valve with narrow lobiform process slightly shorter than broad lobiform process, both processes dorsally inclined; broad lobiform process gradually narrowing from midlength toward apex, lateral margins converging at 145 °; basal interval between processes 0.5 × basal width of narrow lobiform process (Fig. 3 E ).

Etymology.

The specific epithet “ rufitegularis ” is derived from the reddish-brown coloration of the tegulae.

Distribution.

China: Zhejiang.

Variation.

Body length 6.0–7.0 mm in the females; labrum dusky brown to yellowish-brown; basal part to most of vein C in the forewing yellowish-brown; stigma occasionally brown medially; posterior margin of pronotum occasionally partially blackish-brown; cercus 6.0–7.0 × as long as wide; petiole of anal cell of hindwing 1.6–1.8 × as long as cu-a. In males, small parts of the posterior margin of the metanotum drak brown or yellowish-brown; cercus 2.0–3.0 × as long as wide.

Remarks.

The new species is similar to P. japonicus Togashi, 1991 , but can be distinguished by the following combination of characters: pronotum black; legs yellowish-white to reddish-brown; tegula reddish-brown; metatarsomere 1 slightly shorter than the combined length of metatarsomeres 2–4; lancet with 15 serrulae; harpes of the gonoforceps apically about 0.3 × as wide as basally, on the inner surface without tubercle, swollen at the basal third; penis valve with narrow lobiform process slightly shorter than broad lobiform process, basal interval between processes 0.5 × basal width of narrow lobiform process. In contrast, P. japonicus has yellowish or pale yellow pronotal lobes and tegula; legs yellow; metatarsomere 1 slightly longer than the combined length of metatarsomeres 2–4; lancet with 20 serrulae; harpes of the gonoforceps apically about 0.25 × as wide as basally, with a small tubercle medially on the inner surface, swollen at the basal third; penis valve with narrow lobiform process distinctly shorter than broad lobiform process, basal interval between processes 0.2 × basal width of narrow lobiform process.

Figures

Figure 1. P. rufitegularis sp. nov., female holotype; male paratype A female, in dorsal view B female, in lateral view C male, in dorsal view D male, in lateral view. Scale bars: 2 mm (A, C); dorsal and lateral views of the adult specimens were taken at the same scale.

Figure 2. Detailed morphological characters of P. rufitegularis sp. nov. A female, head, dorsal view B female, head, anterior view C female, antenna, lateral view D female, thoracic notum E female, thoracic pleuron F female, ovipositor sheath, lateral view G female, ovipositor sheath, dorsal view H male, abdominal apex, dorsal view.

Figure 3. Genitalia of P. rufitegularis sp. nov. A female, lancet B female, 4 th – 8 th serrulae C female, tangium D male, gonoforceps E male, penis valve. Scale bars: 200 μm (A, D); 50 μm (B); 100 μm (C, E).