Fagineura longitangia Liu, Li & Wei, 2021

Liu, Meng-Meng, Li, Ze-Jian & Wei, Mei-Cai, 2021, A key to all species of Fagineura Vikberg & Zinovjev (Hymenoptera, Tenthredinidae) worldwide with the descriptions of two new Chinese species, Journal of Hymenoptera Research 83, pp. 125-137 : 125

Fagineura longitangia Liu, Li & Wei sp. nov.

Figure 4

Material examined.

Holotype, female, China: Hunan Province, Yizhang County, Mang Mountain, Datangkeng , 24°59.02'N, 112°48.14'E, 1090 m, 11 April 2007, leg. Mei-Cai Wei, ASMN.

Diagnosis.

F. longitangia is most similar to F. flactoserrula in having both the frontal area entirely black; mesonotum mostly black; wing veins mostly black-brown; margin of valvula 3 black; but F. longitangia can be differentiated from the latter by most of supraclypeal area, inner orbit, metapleuron, most of abdominal terga yellowish brown (Fig. 4C, E ); posterodorsal corner of metepimeron squared (Fig. 2M ); middle fovea sub-circular; circumocellar furrow distinct; postocellar area 2.5 × as wide as long (Fig. 2K ); lancet with 16 serrulae, each middle serrula with 13-16 distal teeth; annular suture 1 distinctly curved, sutures 1-11 with setae bands, longest setae band about 0.6 × length of annulus; cypsella 1-9 absent (Fig. 2C ); tangium with 6 campaniform sensilla, and basoventral corner not swollen (Figs 2G , 4H-I ).

Description.

Holotype, female. Body length approximately 7.5 mm (Fig. 4A ).

Color. Body yellowish brown. Area surrounding subantennal groove and anterior tentorial pit, antenna, most of frontal aspect of head, anterior margin of pronotum, mesonotum except triangular spot of median mesoscutal lobe, metanotum, ventral third and posterior margin of mesepisternum, most of mesepimeron, median spot and lateral margin of tergum 1, margin of valvula 3 black; cenchrus yellowish white. Wings hyaline, without smoky macula, stigma and veins black brown.

Head. Base of labrum elevated weakly, apex rounded; base of clypeus elevated, anterior margin of clypeus and incised to 0.3 × length of clypeus, lateral corners rounded; labrum smooth and shiny, without punctures and microsculpture, clypeus smooth and shiny, with few fine punctures, without microsculpture. Malar space 0.3 × as long as diameter of median ocellus. Inner margins of eyes convergent downward in frontal view, distance between eyes 1.6 × as long as height of eye (Fig. 4C ). In dorsal view, inner margins of eyes subparallel; middle fovea sub-circular, deep, with a longitudinal groove at bottom. Frontal area hardly elevated, weakly shiny, with some hair warts and wrinkles, punctures small and sparse; anterior wall elevated and curved, notched medially, lateral walls slightly low and blunt, lateral furrows of frontal area broad and shallow. The top surface of ocelli higher than the top surface of eye in lateral view; interocellar furrow broad and deep, postocellar furrow slightly narrow and shallow; circumocellar furrow distinct; POL: OOL: OCL = 1.0: 1.0: 0.7 (Fig. 4B ). Vertex and postocellar area smooth and shiny, punctures faint and sparse, without microsculpture; postocellar area convex, middle furrow of postocellar area narrow and shallow, 2.5 × as wide as long, lateral postocellar furrows broad and shallow, subparallel backward (Fig. 4B ). Antenna filiform, slightly shorter than thorax and abdomen together, relative length of antennomere 3: antennomere 4: antennomere 5 = 1.0: 1.4: 1.2 (Fig. 4D ).

Thorax. Mesonotum shiny, with minute and slightly sparse punctures, microsculpture indistinct; median mesoscutal groove very shallow and narrow; mesoscutellum and mesoscutellar appendage shiny, with minute and slightly dense punctures, microsculpture indistinct, mesoscutellum 0.7 × as long as wide; mesoscutellar appendage approximately 0.3 × as long as scutellum, middle ridge low and blunt. Distance between cenchri 0.9 × as long as breadth of cenchrus. Mesepisternum smooth and shiny, setigerous punctures fine and very sparse, without microsculpture; mesepimeron smooth and shiny, with some microsculpture on margins, punctures indistinct, posterior part of katepimeron covered with setae; metapleuron shiny and smooth, posterior of metepisternum with some setigerous punctures, without microsculpture (Fig. 4E ). Vein Sc little basad of origin of vein M from R, vein M slightly shorter than vein R+M; forewings with cross-vein cu-a joining cell 1M at basal 0.5, cell 2Rs 1.5 × as long as wide, petiole of anal cell of hindwing 1.4 × as long as cu-a.

Abdomen. All abdominal terga slightly shiny, with weak and sparse setigerous punctures, microsculpture fine and dense. Ovipositor sheath shiny, punctures on valvula 3 small and very sparse, microsculpture indistinct; ovipositor sheath 1.9 × as long as metatarsomere 1 and 1.2 × as long as front tibia, valvula 3 1.2 × as long as valvifer 2; in lateral view, sheath tapering toward apex (Fig. 4F ); in dorsal view, apex of cercus slightly protruding beyond valvula 3, angle between most lateral setae of valvula 3 about 70° (Fig. 4G ). Lancet with 16 serrulae (Fig. 4I ); each middle serrula always with 13-16 distal teeth (Fig. 4H ); annular suture 1 oblique and curved, sutures 1-11 with setae bands, longest setae band approx. 0.6 × length of annulus; cypsellae 1-9 absent; tangium 4.1 × as long as annulus 1, with 6 campaniform sensilla, radix approximately as long as lamnium (Fig. 4I ).

Legs. Protarsomere 1 approximately as long as combined length of tarsomeres 2-4; inner apical spur of hind tibia 0.5 × as long as metatarsomere 1, hind tibia 1.3 × as long as hind tarsus, metatarsomere 1 0.7 × as long as combined length of metatarsomeres 2-5; tarsal claw with inner tooth 0.7 × as long as outer tooth.

Male. Unknown.

Distribution.

China (Hunan).

Remarks.

The new species is very similar to F. flactoserrula Liu, Li & Wei, 2019, having similar body color, clypeus, antenna and so on, but F. longitangia can be distinguished from the latter using the above diagnosis and key to species. While we recognize that some of these differences are quite small, we found the characters of F. flactoserrula described Liu et al. (2019) to be relatively steady across the two specimens we examined. Furthermore, we argue that the holotype of F. longitangia differs in too many respects for these differences to be attributable to intraspecific variability of F. flactoserrula , and that it therefore represents a distinct species.

Etymology.

The specific name " Fagineura longitangia " is refers to the long tangium of the lancet.

Figures

Figure 2. Characters used to identify Fagineura species A F. brevicornis, lamnium (the short double arrow denotes the longest setae band, the long double arrow denotes the length of the annulus) B F. xanthosoma, lamnium C F. longitangia, lamnium D F. flactoserrula, lamnium E F. brevicornis, tangium F F. xanthosoma, tangium G F. longitangia, tangium (arrow denotes the posterior corner not swollen) H F. flactoserrula, tangium (arrow denotes the posterior corner swollen) I F. longitangia (arrow denotes inner orbit of head) J F. flactoserrula (arrow denotes inner orbit of head) K F. longitangia (arrows from top to bottom denote middle fovea, circumocellar furrow and postocellar area) L F. flactoserrula (arrow denotes inner orbit of head) K F. longitangia (arrows from top to bottom denote middle fovea, circumocellar furrow and postocellar area) M F. longitangia (arrow denotes posterodorsal corner of metepimeron) N F. flactoserrula (arrow denotes posterodorsal corner of metepimeron).

Figure 4. Fagineura longitangia sp. nov., female, paratype A dorsal view B head, dorsal view C head, anterior view D antenna, lateral view E mesopleuron and metapleuron F ovipositor sheath, lateral view G ovipositor sheath, dorsal view H middle serrulae I lancet.