Tenthredo yudai, 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 : 230-232

Tenthredo yudai sp. nov. ( Figure 3A–I )

Diagnosis. This new species belongs to Tenthredo mongolica group. The new species is very similar to T. rubitarsalitia Wei & Xu, 2012 ( Yan et al., 2012), but differs from the latter by having the abdominal terga without purplish tinge, the apical 2/5 and lateral sides of abdominal tergum 1 bright yellow, the 3rd tergum entirely black or with a narrow reddish apical margin, antenna entirely and a large rectangular maucla on mesoscutellum orange brown, hind femora reddish with black stripe on posterior side, postocellar area 1.5× as broad as long, the mesoscutal median groove distinct, mesoscutellum roundly elevated and without middle carina or peak, appendage with a broad and obtuse middle carina, the lateral side of mesepisternum reticulate with distinct punctures, the middle serrulae of lancet weakly oblique, with 2–3 proximal and 8–9 distal teeth. While the T. rubitarsalitia has the abdomen with distinct purplish tinge, the tergum 1 entirely black, the tergum 3 largely and the lateral sides of tergum 4 yellowish white; antenna mostly black with reddish base; mesoscutellum and hind femur entirely black, postocellar area 2× as broad as long; mesoscutal median groove absent, mesoscutellum strongly elevated with a distinct middle carina and peak, appendage with a narrow middle carina, the lateral side of mesopleuron densely microsculptured without lage puncture, the middle serrulae of lancet strongly oblique, with 2 proximal and 6–7 distal teeth.

Description. Female. Holotype. Body length 11.0 mm. Body black; labrum except for anterior margin, clypeus entirely, apical 2/5 and lateral side of abdominal tergum 1 bright yellow; posterior margin of pronotum and a large rectangular maucla on mesoscutellum orange brown; palp largely, mandible except black apex, malar space, a triangular macula on supraclypeal area, anterior margin of supraantennal tubercles, antenna, tegula, apical margins of abdominal terga 4–7 (gradually broader from terga 4 to 7), abdominal tergum 8 almost entirely, abdominal tergum 10, apical stripes of sternum 6, sternum 7 largely and ovipositor sheath reddish brown. Legs reddish brown, coxa except ventral apex and a broad posterior stripe on each femur black. Wings subhyaline, apex slightly infuscate, forewing with veins C, Sc, pterostigma, anterior side of Sc+R, basal part of M+Cu, 1A and 3A, hindwing with vein C pale brown, other veins dark brown to blackish brown. Body hairs silver, setae on ovipositor sheath long and slightly curved, blackish brown ( Fig. 3A ).

Labrum and clypeus shiny, surface of clypeus with sparse, shallow and large punctures, without microsculpture ( Fig. 3C ); dorsum of head with extreme dense and coarse punctures, interspaces linear and shiny, without microsculpture ( Fig. 3B ); mesonutum densely punctured with central area of each lobe densely microsculptued, matt; mesoscutellum and appendage except middle carina densely punctured, slightly shiny, middle carina of appendage shiny; anterior slope of metascutellum with large and shallow punctures, otherwise almost smooth, sihny; lateral side of mesopleuron reticulate, almost matt, ventral side densely microsculptured, matt; mesepimeron and metepisternum with small and dense punctures; metepimeron largely shiny, posterior margin with some punctures ( Fig. 3E ). Abdominal tergum feebly microsculptured; other abdominal terga densely microsculptured, without distinct puncture.

Clypeus large and flat, broader than shortest distance between eyes, anterior margin triangularly incised to 1/3 length of clypeus; labrum large, apical margin weakly protruding ( Fig. 3C ); malar space 1.2× as broad as diameter of middle ocellus; inner margin of eyes distinctly convergent downwards, shortest distance between eyes 1.1× as broad as longest axis of eyes (8.7: 7.8); upper margin of tourli elevated; supraantennal tubercles indistinct, almost flat and confluent with frons; median fovea shallow, bottom with a low but distinct middle ridge; lateral foveae deep; frons subsquare, slightly elevated, without frontal ridge; interocellar furrow distinct, postocellar furrow indistinct; POL: OOL: OOCL = 2.5: 7: 5; postocellar area weakly elevated, 1.5× as broad as long (7.5: 5), marginal carina sharp; lateral furrows shallow and curved, divergent backwards; in dorsal view head weakly dilated behind eyes, 0.6× as broad as eye length ( Fig. 3B ). Antenna stout, 0.9× length of head and thorax together (12: 14), 0.8× length of abdomen (12: 15), antennomere 2 1.2× length of its apical breadth, antennomere 3 1.5× length of antennomere 4 (7.5: 5), ratio of antennomeres 5–9 as 4.5: 3.5: 3: 2.6: 2.1 ( Fig. 3D ). Mesoscutal median groove clear, mesoscutellum roundly elevated, without middle carina or peak; appendage with a broad and obtuse middle carina; middle of mesopleuron elevated with an distinct oblique carina, ventral thorn absent ( Fig. 3E ); distance between cenchri 2× breadth of a cenchrus. Hind inner tibial spur 1.25× as broad as apical breadth of hind tibia (1: 0.8), 1/3 length of metabasitarsus (1: 3); metabasitarsus slender, 0.7× as long as following 4 tarsomeres together (3: 4.5); plantar lobe 1 of hind tarsus narrow, 1.2× as broad as apical breadth of metabasitarsus, distance between plantar lobes 1 and 2 2× length of plantar lobe 2; claw without basal lobe, inner tooth much shorter than outer tooth. Ovipositor sheath as long as fore tibia, valvula 3 1.6× as long as valvifer 2, apical margin roundish in lateral view ( Fig. 3F ) and tapering toward apex in dorsal view ( Fig. 3G ). Forewing with vein R+M slightly shorter than vein 1M, cell 2Rs slightly shorter than cells 1R 1 and 1Rs together (5: 6), vein 2r joining cell 2Rs at apical 2/5, vein cu-a joining cell M at basal 1/4, anal cell of hindwing sessile ( Fig. 3A ). Lancet narrow with 21 serrulae ( Fig. 3H ), serrulae low triangularly protruding and slightly oblique, middle serrulae each with 2–3 proximal and 8–9 distal small teeth, annular spine bands narrow, spines sparse; 5th–8th serrulae from base as Fig. 3J .

Male. Unknown.

Material examined. Holotype. ♀, LSAF17024 , China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.323ºN, 119.442ºE, elev. 405 m), 6 April 2017, leg. Zejian Li & Mengmeng Liu. Paratypes. 4♀, LSAF17024 , same data to holotype; 9♀, LSAF17025 – LSAF17026 , LSAF17028 - LSAF17029 , LSAF17037 – LSAF17038 , China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.323ºN, 119.442ºE, elev. 405 m), 6–17 April 2017, leg. Zejian Li, Mengmeng Liu, Kaiwen Gao & Tingting Ji ; 9♀, LSAF16141 , LSAF16144 , LSAF16146 , China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.322ºN, 119.443ºE, elev. 362 m), 13–17 April 2016, leg. Zejian Li, Mengmeng Liu & Zhiwei Chen ; 2♀, LSAF14008 , China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.36ºN, 119.44ºE, elev. 400 m), 11 April 2014, leg. Zejian Li ; 2♀, LSAF15026 , LSAF15028 , China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.323ºN, 119.442ºE, elev. 405 m), 8–10 April 2015, leg. Zejian Li ; 10♀, LSAF18005 – LSAF18006 , LSAF18012 , LSAF 18018 – LSAF18019 , China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.323ºN, 119.442ºE, elev. 405 m), 29–30 March – 7–8 April 2018, leg. Mengmeng Liu, Kaiwen Gao & Tingting Ji ; 2♀, China, Zhejiang, Mt. Tianmu , (elev. 1100–1500 m), 5–6 May 2017, leg. Wenxuan Bi ; 1♀, China, Zhejiang, Mt. Tianmu , (elev. 800–1100 m), 8 April 2018, leg. Wenxuan Bi ; 1♀, China, Zhejiang, Mt. Tianmu , (elev. 330–450 m), 9–15 April 2018, leg. Wenxuan Bi ; 5♀, LSAF19007 – LSAF19008 , China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.322ºN, 119.443ºE, elev. 362 m), 5–8 April 2019, leg. Zejian Li & Xiufang Li.

Variety. Female body length 11.0–12.0 mm.

Etymology. The specific epithet “ yudai ”, a pronunciation of two Chinese characters, Yu-Dai, referring to the abdominal tergum 1 with a bright yellow band.

Distribution. China (Zhejiang).

Funding This research was partly supported by the National Natural Science Foundation of China (31970447).

Acknowledgements The authors are deeply grateful to anonymous referees for valuable comments and suggestions.

Figures

Figure 3. Tenthredo yudai sp. nov., ♀, holotype.A. Female, dorsal view; B. Head of female, dorsal view; C. Head of female, anterior view; D.Antenna of female, lateral view; E. Mesopleuron and metapleuron of female; F. Ovipositor sheath, lateral view; G. Ovipositor sheath, dorsal view; H. Lancet; I. The 5th–8th serrulae. Scale bars:A =2.0mm; H=200µm; I=100µm.