Tenthredo pseudoxanthopleurita, Liu & Li & Wei, 2021

Liu, Mengmeng, Li, Zejian & Wei, Meicai, 2021, Three new species of Tenthredo Linnaeus, 1758 (Hymenoptera: Tenthredinidae) from Jiangxi and Zhejiang Provinces, China, Zoological Systematics 46 (3), pp. 225-233 : 228-230

Tenthredo pseudoxanthopleurita sp. nov. ( Figure 2A–O )

Diagnosis. This new species belongs to Tenthredo issiki group. The new species is similar to T. xanthopleurita Wei, 1998 ( Nie & Wei, 1998), but differs from the latter by having the supraclypeal tubercles very low and evenly confluent with reddish frontal ridges, the anterior lobe of pronotum black except the narrow margin, claw with the inner tooth equal to the apical tooth and the postocellar area 1.3× as broad as long. In T. xanthopleurita , the supraclypeal tubercles are strongly elevated with the posterior end suddenly cut-off, not confluent with frontal ridges, the frontal ridge is black and the anterior lobe of pronotum is entirely yellowish white, claw with the inner tooth clearly longer than the apical tooth and the postocellar area is 1.5× as broad as long.

Description. Female. Holotype. Body length 12.0 mm. Body yellowish brown with yellowish white and black spots, abdomen reddish brown; following parts black: apex of mandibles, medially constricted spot on ocellar area, anterior margin of postocellar area and lateral furrow ( Fig. 2C ), propleuron mostly, anterior lobe of pronotum, narrow anterior stripe and broad ventral band of mesepisternum, anterior margin and lower posterior margin of mesepimeron, metepisternum mostly and metepimeron ( Fig. 2F ), anterior mesoscutal lobe except posterior triangular macula, lateral mesoscutal lobe except a small inner triangular macula, mesopostnotum, metascutum and metapostnotum. Wing hyaline, faintly yellowish toward base, forewing with veins C, Sc, base of M+Cu, basal half of 1A and 3A, pterositgima, hindwing with veins C and R1 yellowish brown; other veins dark brown to blackish brown ( Fig. 2A ).

Labrum and clypeus shiny, without microsculpture, apex of labrum with some shallow and large punctures, clypeus without puncture ( Fig. 2D ); doesum of head slightly shiny, with fine and weak punctures ( Fig. 2C ); thorax shiny, with oil luster, mesonotum with minute punctures, slightly dense, without clear microsculpture; mesepisternum with minute punctures, not dense, interspaces between punctures with weak microsculpture; all abdominal terga slightly shiny, surface with very weak punctures and microsculptures.

Clypeus large and flat, clearly broader than shortest distance between eyes, anterior margin incised to 1/4 length of clypeus, lateral lobes broad and short, apical margin obtuse, bottom almost straight ( Fig. 2D ); malar space 1.5× as broad as diameter of median ocellus; supraantennal tubercles weakly elevated and confluent with frontal ridges; median fovea broad, bottom flat; lateral foveae small; interocellar furrows clear, postocellar furrows weak; POL: OOL: OOCL = 1.7: 7: 4.5; postocellar area weakly elevated, 1.3× as broad as than long (6: 4.5), lateral furrows deep and curved, divergent; head behind eyes roundly curved, weakly dilated at first, then distinctly narrowed ( Fig. 2C ). Antenna 1.7× as long as head and thorax together (10: 6), 1.3× as long as abdomen (10: 7.5), antennomere 3 1.1× as long as antennomere 4 (6.8: 6.3), ratio of antennomeres 5–9 as 5.5: 4.2: 3.5: 3.1: 3 ( Fig. 2E ). Mesoscutellum strongly elevated with an acute apex; posttergite with a low middle carina; mesopleuron elevated with an acute middle peak, ventral thorn absent ( Fig. 2F ); distance between cenchri 1.5× breadth of a cenchrus. Hind inner tibial spur 0.5× length of metabasitarsus (25: 52); metabasitarsus slender, 0.7× length of following 4 tarsomeres together (52: 75); claw with inner tooth as long as outer tooth. Ovipositor sheath slightly longer than metabasitarsus, valvula 3 longer than valvifer 2 (14: 11), apical margin roundish in lateral view ( Fig. 2G ), narrow and tapering toward apex in dorsal view ( Fig. 2H ). Forewing with vein cu-a joining cell 1M at basal 1/3, vein 2r joining cell 2Rs at apical 1/3, cell 2Rs longer than cell 1Rs (4.5: 2.7); hindwing with anal cell sessile ( Fig. 2A ). Lancet slender and with 21 serrulae ( Fig. 2I ), serrulae distinctly protruding and oblique, middle serrulae each with 1–2 proximal and 6–8 distal small teeth, annular spine bands narrow, spines sparse; 5 th –8 th serrulae from base as Fig. 2J .

Male. Body length 12.0 mm ( Fig. 2B ); color similar to female; antenna as shown in Fig. 2L; a subgenital plate longer than broad, apex roundish ( Fig. 2M ); gonoforceps ( Fig. 2N ), harpe slightly longer than broad, apical margin round; valviceps of penis valve narraw and long, distinctly curved ( Fig. 2O ).

Material examined. Holotype. ♀, LSAF17076 , China, Zhejiang, Lin’an District, Mt. Tianmu, Kaishanlaodian (30.343°N, 119.433°E, elev. 1106 m), 19 May 2017, leg. Tingting Ji. Paratypes. 1♀, LSAF17076 , same data to holotype; 2♀, LSAF16149 – LSAF16150 , China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.322ºN, 119.442ºE, elev. 405 m), 5–6 May 2016, leg. Zejian Li & Zhiwei Chen ; 4♀ 1♂, LSAF17067 , LSAF17080 , LSAF17089 , China, Zhejiang, Lin’an District, Mt. Tianmu, Kaishanlaodian (30.343°N, 119.433°E, elev. 1106 m), 14 May–7 June 2017, leg. Mengmeng Liu, Kaiwen Gao & Tingting Ji ; 1♀, LSAF18028 , China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.322ºN, 119.442ºE, elev. 405 m), 17–18 April 2018, leg. Mengmeng Liu, Kaiwen Gao & Tingting Ji ; 2♂, LSAF16146 , LSAF16148 , China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.322ºN, 119.442ºE, elev. 405 m), 17 April–4 May 2016, leg. Zejian Li, Mengmeng Liu & Zhiwei Chen ; 2♂, LSAF16174 , China, Jiangxi, Mt. Wugong, Hongyan’gu (elev. 580 m), 3 April 2016, leg. Maoling Sheng & Tao Li ; 1♂, China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.322ºN, 119.442ºE, elev. 405 m), 7 May 2017, leg. Mengmeng Liu, Kaiwen Gao & Tingting Ji. Variety. Female body length 12.0–13.0 mm; male body length 12.0– 12.5 mm.

Etymology. The specific epithet “ pseudoxanthopleurita ” is a noun and composed of “ pseudo- ” (similar) and “ xanthopleurita ” (a species of Tenthredo ), as the new species is very similar to Tenthredo xanthopleurita in body color. Distribution. China (Jiangxi, Zhejiang).

Figures

Figure 2. Tenthredo pseudoxanthopleurita sp. nov. A. Female, dorsal view; B. Male, dorsal view; C. Head of female, dorsal view; D. Head of female, anterior view; E. Antenna of female, lateral view; F. Mesopleuron and metapleuron of female; G. Ovipositor sheath, lateral view; H. Ovipositor sheath, dorsal view; I. Lancet; J. The 5th–8th serrulae; K. Head of male, dorsal view; L. Antenna of male, lateral view; M. Subgenital plate of male, ventral side; N. Gonoforceps; O. Penis valve.A, C–J. Holotype; B, K–O. Paratype. Scale bars: A–B=2.0mm; I, N–O=200µm; J=100µm.