Fagineura brevicornis 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 brevicornis Liu, Li & Wei sp. nov.

Figure 3

Material examined.

Holotype, female, China: Hubei Province, Yichang City, Shengnongjia Mountain, Guitouwan , 31°28.44'N, 110°08.87'E, 2150 m, 19 May 2012, leg. Ze-Jian Li, ASMN.

Diagnosis.

F. brevicornis is most similar to F. xanthosoma in having both the mesepisternum, head and wing veins mainly yellow or yellow-brown; ovipositor sheath entirely yellow or yellowish brown; but F. brevicornis can be differentiated from the latter by the black subantennal groove and area surrounding anterior tentorial pit (in F. xanthosoma these are yellow); malar space 0.4 × as long as diameter of median ocellus; middle fovea sub-circular (Fig. 3B, C ); sheath 2.3 × as long as metatarsomere 1, valvula 3 almost as long as valvifer 2 (Fig. 3G ); lancet with 15 serrulae, sutures 1-12 with setae bands, longest setae band about 0.7 × length of annulus (Fig. 2A ); cypsellae of serrulae 1-7 absent, tangium with 4 campaniform sensilla, radix 1.1 × as long as lamnium (Figs 2E , 3H-J ).

Description.

Holotype, female. Body length approximately 7.0 mm (Fig. 3A ).

Color. Body yellowish brown. Areas surrounding ocelli, antennal sockets, subantennal groove, anterior tentorial pit, scape and pedicel of antenna, triangular spot on the upper side of mesepisternum, anterior edge on the upper side of median mesoscutal lobe, spot of median metascutellum, tergum 1 except triangular spot, anterior edge of tergum 2 black; cenchrus yellowish white. Wings hyaline, without smoky macula, stigma and most parts of veins pale yellow.

Head. Base of labrum elevated, apex rounded; base of clypeus strongly elevated, anterior margin of clypeus arcuate and incised to 0.5 × length of clypeus, lateral corners slightly rounded; labrum and clypeus shiny, basally without punctures or microsculpture, apically with sparse and small punctures, without microsculpture. Malar space 0.4 × as long as diameter of median ocellus. Inner margins of eyes slightly convergent downward in frontal view, distance between eyes 2.0 × as long as height of eyes (Fig. 3C ). In dorsal view, inner margins of eyes subparallel; middle fovea sub-circular, slightly deep, with a longitudinal groove at bottom. Frontal area elevated, slightly shiny, punctures small and somewhat sparse, with weak microsculpture; anterior wall slightly elevated, notched medially, lateral walls low and blunt, lateral furrows of frontal area slightly narrow and shallow. The top surface of ocelli higher than the top surface of eye clearly in lateral view; interocellar furrow broad and shallow, postocellar furrow somewhat narrow and shallow; circumocellar furrow indistinct; POL: OOL: OCL = 0.9: 1.0: 0.8 (Fig. 3B ). Vertex and postocellar area shiny, punctures faint and very sparse, without microsculpture; postocellar area slightly convex, middle furrow of postocellar area faint, approx. 2.2 × as wide as long, lateral postocellar furrows narrow and slightly deep, divergent backward clearly (Fig. 3B ). Antenna filamentous, shorter than thorax and abdomen together, antennomeres 3-8 slightly compressed; antennomere 2 1.2 × as wide as long, relative length of antennomere 3: antennomere 4: antennomere 5 = 1.0: 1.1: 1.0 (Fig. 3E ).

Thorax. Mesonotum slightly shiny, with fine and somewhat dense punctures, without microsculpture; median mesoscutal groove shallow and thin; mesoscutellum shiny, with faint and sparse punctures, without microsculpture, and flat, without middle ridge, about 0.8 × as long as wide; mesoscutellar appendage shiny, with small and sparse punctures, microsculpture indistinct, about 0.3 × length of scutellum, middle ridge very low and blunt. Distance between cenchri as long as breadth of a cenchrus. Mesepisternum shiny, without microsculpture, with fine setigerous punctures; anepimeron of mesepimeron shiny, with few punctures and microsculpture; katepimeron smooth and shiny, posterior part with distinct microsculpture and covered with setae, punctures indistinct; metapleuron shiny and smooth, punctures and microsculpture indistinct (Fig. 3D ). Vein Sc almost interstitial with origin of vein M from R, and vein M shorter than vein R+M; forewings with cross-vein cu-a joining cell 1M at basal 0.6, cell 2Rs 1.5 × as long as wide, petiole of anal cell of hindwing 1.7 × as long as cu-a.

Abdomen. All abdominal terga slightly shiny, with small and very sparse setigerous punctures, microsculpture fine and dense. Ovipositor sheath slightly shiny, punctures on valvula 3 fine and sparse, microsculpture indistinct; sheath 2.3 × as long as metatarsomere 1 and 1.4 × as long as front tibia, valvula 3 almost as long as valvifer 2; in lateral view, sheath tapering toward apex (Fig. 3G ); in dorsal view, apex of cercus hardly protruding beyond valvula 3, angle between most lateral setae of valvula 3 about 40°. Lancet with 15 serrulae (Fig. 3I ); each middle serrula with 14-16 distal teeth (Fig. 3H ); annular suture 1 approximately straight, sutures 1-12 with setae bands, longest setae band about 0.7 × length of annulus; cypsellae of serrulae 1-7, 14-15 absent, cypsellae of serrulae 8-13 short; tangium slender and 5.5 × as long as annulus 1, with 4 campaniform sensilla (Fig. 3J ), 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, 0.8 × as long as outer tooth.

Male. Unknown.

Distribution.

China (Hubei).

Remarks.

The new species can be easily distinguished from the other Fagineura species in body color and antenna (antennomeres 3-8 slightly compressed and looks more stubby than other Fagineura species).

Etymology.

The specific name " Fagineura brevicornis " is refers to the short antenna.

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 3. Fagineura brevicornis sp. nov., female, holotype A dorsal view B head, dorsal view C head, anterior view D mesopleuron and metapleuron E antenna, lateral view F ovipositor sheath, dorsal view G ovipositor sheath, lateral view H middle serrulae I lancet J tangium.