Tenthredo carinacestanella, 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 : 226-228

Tenthredo carinacestanella sp. nov. ( Figure 1A–P )

Diagnosis. This new species belongs to Tenthredo cestanella group. It is quite similar to T. nigrofrontalinia Wei, 1998 ( Wei & Nie, 1998) but differs from the latter by the following: the anterior parts of the supraantennal tubercles distinctly elevated, median fovea deep; in dorsal view the female head behind eyes dilated in anterior half; the black macula on dorsum of head large and almost touching eyes; the mesepisternum with a short but distinct middle oblique carina; the female serrulae flat; harpes of male longer than broad and the valviceps of penis valve narrow and curved. In T. nigrofrontalinia Wei , the anterior of the supraantennal tubercles very low and faintly elevated, median fovea shallow; in dorsal view the female head behind eyes not dilated in anterior half; the black macula on dorsum of head remote from eyes; the mesepisternum with a small middle peak but without oblique carina; the female serrulae quite oblique; harpes of male broader than long and the penis valve with a long apical filament.

Description. Female. Holotype. Body length 14.0 mm; body mostly yellowish brown, head and thorax with faint greenish tinge, dorsum of abdominal tergites 2–8 brown; dorsum of head with a large black macula covering frons, ocelli, most of upper inner orbit, inner triangle of temple and postocellar furrow; antenna black with scape yellow; anterior lobes of mesonotum with a long and broad stripe, lateral lobes of mesonotum with a long triangular macula, a large and a small macula on dorsum of lateral lobe, bottom of parapsis, narrow posterior margin of metapostnotum, anterior margin and a small lateral spot of abdominal tergum 1, narrow basal stripe on tergum 2 black ( Fig. 1A ). Legs yellowish brown. Wings hyaline, forewing with veins C, Sc, base of M+Cu, base of vein 1A, pterostigma, hindwing with veins C, base of M+Cu, bases of 1A and 2A yellowish brown, other veins mostly blackish brown. Body hairs pale yellowish brown, but hairs on dorsum of head and thorax, and flagellomeres black ( Fig. 1A ).

Head and thorax slightly shiny, without clear puncture ( Fig. 1C ); labrum and clypeus shiny, without puncture or microsculpture ( Fig. 1D ); dorsum of head and thorax, and mesopleuron with very weak microsculptures; mesonotum, mesopleuron and abdominal terga with oil lustre; malar space with clear microsculptures; abdominal terga slightly shiny, with weak microsculptures.

Clypeus large and flat, anterior margin shallowly incised to 1/8 length of clypeus ( Fig. 1D ); malar space 1.5× as broad as diameter of median ocellus; supraantennal tubercles clearly elevated and confluent with frontal ridges; inner margin of eyes distinctly convergent downwards, shortest distance between them 1.1× as broad as longest axis of eyes (10: 9.7); median fovea broad and deep, bottom flat, lateral foveae shallow; interocellar and postocellar furrows clear, POL: OOL: OOCL = 1.6: 7: 5; postocellar area weakly elevated, 1.3× as broad as long (6.5: 5), lateral furrows deep, faintly curved; in dorsal view head behind eyes roundly curved, dilated at anterior half, posterior half distinctly narrowed ( Fig. 1C ). Antenna 1.1× length of head and thorax together (9: 8.4), 0.8× length of abdomen (9: 11), antennomere 3 1.3× length of antennomere 4 (9.6: 7.2), ratio of antennomeres 5–9 as 5.5: 4.5: 3.5: 3: 2.5 ( Fig. 1E ). Mesoscutellum strongly elevated, with an acute apex ( Fig. 1F ), mesoscutellar appendage smooth, with weak middle carina; median of mesepisternum strongly elevated with a short but distinct oblique carina, ventral thorn distinct ( Fig. 1G ); distance between cenchri 2× breadth of a cenchrus. Hind tibia 0.9× length of hind tarsus (35: 38), inner spur of hind tibia 0.5× length of metabasitarsus (18: 35); metabasitarsus slender, 0.7× length of following 4 tarsomeres together (15: 23); claw with inner tooth broader and longer than outer tooth. Ovipositor sheath slightly longer than metabasitarsus, valvula 3 clearly longer than valvifer 2 (11.8: 8); dorsal apical corner of valvula 3 distinct in lateral view ( Fig. 1H ), lateral setae short and straight in dorsal view ( Fig. 1I ). Forewing with vein cu-a joining cell 1M at basal 1/4, vein 2r joining cell 2Rs at apical 2/5, cell 2Rs slightly length of cell 1R 1 and cell 1Rs together; hindwing with anal cell sessile ( Fig. 1A ). Lancet narrow with 21 serrulae ( Fig. 1J ), serrulae almost flat, middle serrulae each with 1– 2 proximal and 16–18 distal minute teeth, 5th–8th serrulae from base as Fig. 1K .

Male. Body length 12.0 mm ( Fig. 1B ); posterior of middle and hind femora with broad black stripe; postocellar area 1.7× as broad as long (6: 3.6), dorsal view of head distinctly narrowed behind eyes ( Fig. 1L ); lateral view of antenna as shown in Fig. 1M ; apical margin of subgenital plate subtruncate ( Fig. 1N ); penis valve long and narrow, valviceps narrow and strongly curved ( Fig. 1O ); gonoforceps as Fig. 1P , harpe longer than broad, apical margin round.

Material examined. Holotype. ♀, LSAF17034 , China, Zhejiang, Lin’an District, Mt. Tianmu, Kaishanlaodian (30.343°N, 119.433°E, elev. 1106 m), 14 April 2017, leg. Mengmeng Liu, Kaiwen Gao & Tingting Ji. Paratypes. 13♀ 23♂, LSAF17034 , same data as holotype ; 5♀ 14♂, LSAF14007 , China, Zhejiang, Lin’an District, Mt. Tianmu, Kaishanlaodian (30.34°N, 119.43°E, elev. 1140 m), 9–10 April 2014, leg. Zejian Li ; 8♀ 12♂, LSAF15022 , LSAF15024 , China, Zhejiang, Lin’an District, Mt. Tianmu, Kaishanlaodian (30.343°N, 119.433°E, elev. 1106 m), 5–11 April 2015, leg. Zejian Li ; 6♀, LSAF16143 , LSAF16153 , China, Zhejiang, Lin’an District, Mt. Tianmu, Kaishanlaodian (30.343°N, 119.433°E, elev. 1106 m), 14 April–4 May 2016, leg. Zejian Li, Mengmeng Liu & Zhiwei Chen ; 51♀ 57♂, LSAF17036 , LSAF17040 , LSAF17049 , LSAF17053 , China, Zhejiang, Lin’an District, Mt. Tianmu, Kaishanlaodian (30.343°N, 119.433°E, elev. 1106 m), 15–29 April 2017, leg. Mengmeng Liu, Kaiwen Gao & Tingting Ji ; 1♀ 1♂, LSAF18009 , LSAF18014 , China, Zhejiang, Lin’an District, Mt. Tianmu, Kaishanlaodian (30.343°N, 119.433°E, elev. 1106 m), 31 March–6 April 2018, leg. Mengmeng Liu, Kaiwen Gao & Tingting Ji ; 2♀, LSAF19009 , China, Zhejiang, Lin’an District, Mt. Tianmu, Kaishanlaodian (30.343°N, 119.443°E, elev. 1106 m), 6–7 April 2019, leg. Zejian Li & Xiufang Li ; 3♀, LSAF16144 , LSAF16146 , China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.323ºN, 119.442ºE, elev. 405 m), 15–17 April 2016, leg. Zejian Li, Mengmeng Liu & Zhiwei Chen ; 2♀ 4♂, LSAF17024 , LSAF17035 , LSAF17038 , LSAF17050 , China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.323ºN, 119.442ºE, elev. 405 m), 6–25 April 2017, leg. Zejian Li, Mengmeng Liu & Tingting Ji ; 5♀ 36♂, LSAF18005 – LSAF18006 , LSAF18011 – LSAF18013 , LSAF18018 , LSAF18031 , China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.323ºN, 119.442ºE, elev. 405 m), 29 March–20 April 2018, leg. Zejian Li, Mengmeng Liu, Kaiwen Gao & Tingting Ji ; 1♀, LSAF19021 , China, Zhejiang, Lin’an District, Mt. Tianmu, Chanyuan Temple (30.322ºN, 119.443ºE, elev. 362 m), 4 May 2019, leg. Zejian Li, Xiufang Li & Tingting Ji ; 1♂, LSAF16156 , China, Zhejiang, Lin’an District, Mt. Tianmu, Xianrending (30.349°N, 119.424°E, elev. 1506 m), 29 May 2016, leg. Zejian Li & Mengmeng Liu ; 14♀, LSAF17054 , China, Zhejiang, Lin’an District, Mt. Tianmu, Xianrending (30.349°N, 119.424°E, elev. 1506 m), 28–29 April 2017, leg. Zejian Li, Mengmeng Liu, Kaiwen Gao & Tingting Ji ; 3♂, LSAF18036 , LSAF18046 , LSAF18048 , China, Zhejiang, Lin’an District, Mt. Tianmu, Xianrending (30.349°N, 119.424°E, elev. 1506 m), 11 May–1 June 2018, leg. Zejian Li, Mengmeng Liu & Tingting Ji ; 3♂, LSAF19023 , China, Zhejiang, Lin’an District, Mt. Tianmu, Xianrending (30.350°N, 119.424°E, elev. 1506 m), 3 May 2019, leg. Zejian Li.

Variety. Female body length 13.5–14.5 mm; male body length 11.0–12.0 mm.

Etymology. The specific epithet, a noun, is composed of “ carina- ” referring to the oblique carina on the mesepisternum and “ cestanella ”, a similar species of Tenthredo .

Distribution. China (Zhejiang).

Figures

Figure 1. Tenthredo carinacestanella 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. Mesoscutellum of female, lateral view; G. Mesopleuron and metapleuron of female; H. Ovipositor sheath, lateral view; I. Ovipositor sheath, dorsal view; J. Lancet; K. The 5th–8th serrulae; L. Head of male, dorsal view; M. Antenna of male, lateral view; N. Subgenital plate of male, ventral side; O. Penis valve; P. Gonoforceps. A, C–K. Holotype; B, L–P. Paratype. Scale bars: A–B=2.0mm; J, O–P =200µm; K =100µm.