Fagineura flactoserrula, 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 flactoserrula sp. n. Fig. 1

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. Paratype, 1♀, China, Hubei Province, Yichang City, Shennongjia Mountain, Yinyuhe, 31°34'00"N, 110°20'22"E, 2100 m, 16 May 2012, leg. Zejian Li.

Diagnosis.

Body mostly black; labrum and clypeus pale yellow (Fig. 1 b–c); most parts of mesepisternum yellowish-brown (Fig. 1e); most of stigma pale yellowish-brown but margins black brown, veins in most part black brown; labrum and clypeus smooth and shiny, with few faint setigerous punctures, without microsculpture; frons slightly shiny, with hair warts and few wrinkles, punctures minute and sparse (Fig. 1 b–c); vertex and postocellar area shiny, punctures faint and sparse, without microsculpture; malar space 0.5 × as long as diameter of median ocellus; postocellar area slightly convex, without mesosulcus, approx. 3.0 × as wide as long; relative length of antennomere 3: antennomere 4: antennomere 5 = 1.0: 1.5: 1.2 (Fig. 1d); forewings with cross-vein cu-a joining cell 1M at basal 0.5, cell 2Rs 1.2 × as long as wide, petiole of anal cell of hindwing 1.6 × as long as cu-a; lancet with 14 serrulae (Fig. 1i); annular suture 1 oblique and slightly curved, sutures 1-10 with setae bands, longest setae band about 0.7 × length of annulus; tangium 3.4 × as long as annulus 1, radix 1.1 × as long as lamnium (Fig. 1j).

Description.

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

Color. Body mostly black. Labrum, clypeus, most parts of pronotum, most parts of propleuron, tegula, most parts of all coxae, all trochanters and femora pale yellow; most parts of vertex and temple, triangular spot of median mesoscutal lobe and mesoscutellum, most parts of mesepisternum, speckles on terga, sterna of abdomen, all tibiae and tarsi yellowish-brown; valvifer 2 pale yellow, valvula 3 yellowish-brown to black; cenchrus yellowish-white. Wings hyaline, most parts of stigma pale yellowish-brown with margins black brown, veins in most part black brown.

Head. Inner margins of eyes slightly convergent downward in frontal view, distance between eyes 1.9 × as long as height of eyes. Base of labrum elevated, apex slightly rounded; base of clypeus elevated, anterior margin of clypeus incised to 0.3 × length of clypeus, lateral corners rounded; labrum and clypeus shiny, with few faint setigerous punctures, without microsculpture. Malar space 0.5 × as long as diameter of median ocellus (Fig. 1c). Middle fovea long and groove-like, narrow and deep. Frons elevated, slightly shiny, with hair warts and few wrinkles, punctures minute and sparse; anterior wall slightly elevated and curved, notched medially, lateral walls low and blunt. Interocellar furrow broad and shallow, postocellar furrow slightly narrow and deep; circumocellar furrow indistinct; POL: OOL: OCL = 1.0: 1.1: 0.6 (Fig. 1b). Vertex and postocellar area shiny, punctures faint and sparse, without microsculpture; postocellar area slightly convex, without mesosulcus, approx. 3.0 × as wide as long, lateral furrows broad and slightly deep, parallel; in dorsal view, inner margins of eyes slightly divergent (Fig. 1b). Antenna filamentous, antennomere 3 slightly compressed, slightly shorter than thorax and abdomen together; antennomere 2 1.3 × as wide as long, relative length of antennomere 3: antennomere 4: antennomere 5 = 1.0: 1.5: 1.2 (Fig. 1d).

Thorax. Mesonotum shiny, with fine and slightly dense punctures, without microsculpture; median mesoscutal groove shallow and thin; mesoscutellum shiny, with faint and sparse punctures, and flat, posterior half of middle ridge distinct, about 0.8 × as long as wide; mesoscutellar appendage slightly shiny, with weak and sparse punctures, microsculpture faint, about 0.3 × length of scutellum, middle ridge low and blunt. Distance between cenchri as long as breadth of a cenchrus. Mesepisternum smooth and shiny, setigerous punctures and microsculpture indistinct; anepimeron of mesepimeron slightly shiny, with few wrinkles, punctures faint; katepimeron shiny, most parts with microsculpture and posterior part distinct, punctures weak and very sparse, posterior part covered with few setae; metapleuron shiny and smooth, with few weak punctures, microsculpture indistinct (Fig. 1e). Vein Sc interstitial with origin of vein M from R, and vein M slightly shorter than vein R+M; forewings with cross-vein cu-a joining cell 1M at basal 0.5, cell 2Rs 1.2 × as long as wide, petiole of anal cell of hindwing 1.6 × as long as cu-a.

Abdomen. All abdominal terga shiny, with faint sparse setigerous punctures, microsculpture fine and very dense. Ovipositor sheath smooth and shiny, punctures laterally on valvula 3 weak and sparse, microsculpture indistinct; sheath 2.0 × as long as metatarsomere 1 and 1.3 × as long as front tibia, valvula 3 as long as valvifer 2; in lateral view, sheath tapering toward apex (Fig. 1g); in dorsal view, apex of cercus protruding beyond valvula 3, angle between most lateral setae of valvula 3 about 60° (Fig. 1f). Lancet with 14 serrulae (Fig. 1i); each middle serrula with 10-13 distal teeth (Fig. 1h); annular suture 1 oblique and slightly curved, sutures 1-10 with setae bands, longest setae band about 0.7 × length of annulus; cypsella of serrulae 1-5 nearly absent, cypsella of serrulae 6-12 short and deep; tangium 3.4 × as long as annulus 1, with one campaniform sensillum (Fig. 1j), radix 1.1 × as long as lamnium.

Legs. Protarsomere 1 shorter than combined length of tarsomeres 2-4; inner apical spur of hind tibia 0.4 × as long as metatarsomere 1, metatarsomere 1 0.6 × as long as combined length of metatarsomeres 2-5; tarsal claw with inner tooth long, but slightly shorter than outer tooth.

Male. Unknown.

Distribution.

China (Hubei).

Variation.

Triangular spot on median mesoscutal lobe yellowish-brown to black-brown; mesoscutellum entirely black, or sometimes with yellowish-brown speckles; tangium with one campaniform sensillum, or none.

Remarks.

The new species is similar to F. crenativora Vikberg & Zinovjev, 2000, but can be distinguished from the latter by the following characters: metapleuron mostly black; orbit black in the female; postocellar area 3.0 × as wide as long; sheath without emargination apically; cerci almost as long as the sheath; lancet with 14 serrulae, annular suture 1 of lancet oblique and slightly curved, and with 7 marginal sensilla below.

Etymology.

The specific name is derived from the flattened serrulae of the lancet.