Fagineura xanthosoma, Liu, Mengmeng, Li, Zejian & Wei, Meicai, 2019

Liu, Mengmeng, Li, Zejian & Wei, Meicai, 2019, First record of the genus Fagineura Vikberg & Zinovjev (Hymenoptera, Tenthredinidae) with descriptions of two new species from China, ZooKeys 829, pp. 29-42 : 29

Fagineura xanthosoma sp. n. Fig. 2

Type material.

Holotype, ♀, China, Hubei Province, Yichang City, Shennongjia Mountain, Yinyuhe, 31°34'00"N, 110°20'22"E, 2100m, 17 May 2012, leg. Zejian Li, CSCS. Paratypes (15♀♀): 1♀, China, Hubei Province, Yichang City, Shennongjia Mountain, Yinyuhe, 31°34'00"N, 110°20'22"E, 2100 m, 17 May 2012, leg. Zejian Li; 1♀, China, Hunan Province, Wugang City, Yun Mountain, Television tower, 26°38'38"N, 110°37'18"E, 1380 m, 11 April 2012, leg. Zejian Li and Zaiyang Pan; 1♀, China, Hunan Province, Wugang City, Yun Mountain,1100 m, 25 April 2005, leg. Yingke He; 8♀♀, China, Hunan Province, Yongzhou City, Yangming Mountain, 900 to 1000 m, 24 April 2004, leg. Shaobing Zhang; 3♀♀, China, Hunan Province, Yongzhou City, Yangming Mountain, 1000 to 1300 m, 24 April 2004, leg. Meicai Wei; 1♀, China, Hunan Province, Yongzhou City, Yangming Mountain, 1000 to 1300 m, 24 April 2004, leg. Wei Xiao.

Diagnosis.

Body pale yellow to pale yellowish-brown; stigma and most parts of veins pale yellow (Fig. 2a); frons slightly shiny, with some hair warts and wrinkles, punctures weak and very sparse; malar space 0.8 × as long as diameter of median ocellus; interocellar furrow broad and very shallow, postocellar furrow broad and slightly shallow; postocellar area convex, without mesosulcus, 2.8 × as wide as long (Fig. 2 b–c); relative length of antennomere 3: antennomere 4: antennomere 5 = 1.0: 1.2: 1.0 (Fig. 2e); vein M about as long as vein R+M; forewings with cross-vein cu-a joining cell 1M at basal 0.6, cell 2Rs 1.4 × as long as wide, petiole of hind anal cell 1.3 × as long as cu-a (Fig. 2a); lancet with 21 serrulae (Fig. 2i); each middle serrula always with 14-17 distal teeth (Fig. 2h); annular suture 1 straight but oblique, sutures 1-13 with setae bands, longest setae band approx. 0.9 length of annulus; tangium 5.5 × as long as annulus 1, radix 0.6 × as long as lamnium (Fig. 2i, 2j).

Description.

Holotype, female. Body length approximately 7.0 mm (Fig. 2a).

Color. Body pale yellow to pale yellowish-brown. Lateral fovea, around ocelli, dorsal side of scape and pedicel, anterior edge and medial spot of tergum 1 black; cenchrus yellowish-white. Wings hyaline, stigma and most parts of veins pale yellow.

Head. Inner margins of eyes slightly convergent downward in frontal view, distance between eyes 2.4 × as long as height of eye (Fig. 2c). Base of labrum elevated, and apex rounded; base of clypeus elevated, anterior margin of clypeus incised to 0.3 × length of clypeus, lateral corners rounded; labrum and clypeus smooth and shiny, with few faint setigerous punctures, without microsculpture. Malar space 0.8 × as long as diameter of median ocellus (Fig. 2c). Middle fovea long, groove-like, deep. Frons slightly elevated, slightly shiny, with some hair warts and wrinkles, punctures weak and very sparse; anterior wall elevated and curved, notched medially, lateral walls distinct, but low and blunt. Interocellar furrow broad and very shallow, postocellar furrow broad and shallow; circumocellar furrow indistinct; POL: OOL: OCL = 0.9: 1.0: 0.7 (Fig. 2b). Vertex and postocellar area shiny, punctures faint and sparse, microsculpture indistinct; postocellar area convex, without mesosulcus, 2.8 × as wide as long, lateral furrows short, slightly broad and shallow; in dorsal view, inner margins of eyes subparallel (Fig. 2b). Antenna filiform, shorter than thorax and abdomen together, antennomere 3 slightly compressed; antennomere 2 1.3 × as wide as long, relative length of antennomere 3: antennomere 4: antennomere 5 = 1.0: 1.2: 1.0 (Fig. 2e).

Thorax. Mesonotum slightly shiny, with minute and dense punctures, microsculpture indistinct; median mesoscutal groove shallow and narrow; mesoscutellum shiny, with weak and slightly sparse punctures, and flat, middle ridge indistinct, 0.8 × as long as wide; mesoscutellar appendage shiny, with faint and sparse punctures, without microsculpture, approx. 0.4 × as long as scutellum, middle ridge faint. Distance between cenchri as long as breadth of cenchrus. Mesepisternum shiny, setigerous punctures weak and slightly dense, microsculpture indistinct; mesepimeron shiny, with few faint punctures, with some microsculpture on margins, posterior part of katepimeron extensively covered with setae; metapleuron shiny and smooth, punctures and microsculpture indistinct (Fig. 2d). Vein Sc little basad of origin of vein M from R, vein M about as long as vein R+M; forewings with cross-vein cu-a joining cell 1M at basal 0.6, cell 2Rs 1.4 × as long as wide, petiole of anal cell of hindwing 1.3 × as long as cu-a (Fig. 2a).

Abdomen. All abdominal terga slightly shiny, with faint and sparse setigerous punctures, microsculpture fine and very dense. Ovipositor sheath shiny, punctures laterally on valvula 3 weak and sparse, microsculpture indistinct; ovipositor sheath 1.9 × as long as metatarsomere 1 and 1.2 × as long as front tibia, valvula 3 1.3 × as long as valvifer 2; in lateral view, sheath tapering toward apex (Fig. 2g); in dorsal view, apex of cercus protruding beyond valvula 3, angle between most lateral setae of valvula 3 about 85° (Fig. 2f). Lancet with 21 serrulae (Fig. 2i); each middle serrula always with 14-17 distal teeth (Fig. 2h); annular suture 1 straight but oblique, sutures 1-13 with setae bands, longest setae band approx. 0.9 × length of annulus; cypsella of serrulae 1-2 nearly absent, cypsella of serrulae 3-19 very short and deep; tangium 5.5 × as long as annulus 1, with many campaniform sensilla (Fig. 2j), radix 0.6 × as long as lamnium (Fig. 2i).

Legs. Protarsomere 1 slightly shorter than combined length of tarsomeres 2-4; inner apical spur of hind tibia 0.4 × as long as metatarsomere 1, metatarsomere 1 0.7 × as long as combined length of metatarsomeres 2-5; tarsal claw with inner tooth slightly shorter than outer tooth.

Male. Unknown.

Distribution.

China (Hubei, Hunan).

Variation.

Body length 6.0-8.0mm; scape and pedicel partly to entirely black; around ocelli more or less black; vein Sc a little basad or interstitial with origin of vein M from R, and vein M as long as or slightly shorter than vein R+M; petiole of anal cell of hindwing 1.2-1.6 × as long as cu-a; in dorsal view, apex of cercus protruding far as or beyond valvula 3.

Remarks.

The new species is similar to F. quercivora Togashi, 2006, but can be distinguished from the latter by the following characters: mesepisternum entirely pale yellowish-brown; all coxae and hind tibia pale yellowish; terga 3-10 entirely pale yellowish-brown; ovipositor sheath yellow; malar space 0.8 × as long as diameter of median ocellus; petiole of anal cell of hindwing longer than cu-a; tarsal claw with inner tooth shorter than outer tooth; lancet with 21 serrulae.

Etymology.

The specific name is derived from the body color of adults.