Lasioglossum (Sudila) genotrigonum Zhang et Zhu,

Zhang, Rui, Li, Qiang, Niu, Ze-Qing & Zhu, Chao-Dong, 2011, A newly recorded Subgenus Sudila from China with description of two new species (Hymenoptera: Halictidae: Lasioglossum), Zootaxa 2937, pp. 31-36: 33

publication ID 10.5281/zenodo.203940

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Lasioglossum (Sudila) genotrigonum Zhang et Zhu

sp. nov.

Lasioglossum (Sudila) genotrigonum Zhang et Zhu  , sp. nov.

( Figs. 3–8View FIGURES 3 – 8)

Diagnosis. This species can be distinguished from all other Sudila species by the following combination of characters: body black; metasomal tergum brown apically; hairs sparse; punctures fine, especially on mesoscutum; genal area nearly triangular, margin angulate, as wide as eye; basal 2 / 3 of propodeal dorsum with longitudinal ridges.

Description. Female. BL= 7.9 mm. Body black without metallic tint; apical of mandible, flagellum and wing vein dark brown; tegula, tarsus except basitarsus, and apical of metasomal tergum brown; tibial spur fawn; wing brown and transparent. Hairs whitish and sparse; apical of clypeus with a raw simple, yellowish brown bristles; eye with glabrous hairs; lateral surface of propodeum with dense plumose hairs; tibia, basitarsus and apical of T 5 with yellowish brown hairs; tergum without patch, with sparse simple plumose hairs; scopa well developed.

Head longer than wide. Labrum with tubercle basally. Anterior margin of clypeus truncate, clypeal tooth mild, anterior with fastigiated punctures nearly forming longitudinal furrows; punctures on supraclypeal area fine, IS= 3– 4; sculptures on ocellocular area disɭΓibuɭed equƋb|ʸ, IS= 1; punctures on frons area coarse, IS= 0.5; frontal carina distinct, exceeding the lower margin of anterior ocellus; inner upper margin of eyes concave, lower convergent; scape reaching the half of lateral ocellus. Frontal view of head as in Fig. 3View FIGURES 3 – 8. Seen laterally, genal area nearly triangular, margin angulate ( Fig. 4View FIGURES 3 – 8), EW: GW= 24: 25, above finely and sparsely punctate, IS= 3; HL: HW= 37: 34; IOD: OOD: Od: OCD= 15: 17: 12: 9; UOD: MOD: LOD= 24: 30: 23; scape L: pedicel L: F 1 L: F 2 L: F 3 L: F 4 L: F 5 L: F 6 L: F 7 L: F 8 L: F 9 L: F 10 L= 43: 7: 7: 3: 4: 5: 7: 8: 8: 8: 9: 13; F 2 L: F 2 W= 4: 7. Antenna as in Fig. 5View FIGURES 3 – 8.

Mesoscutum and scutellum with fine punctures, IS= 3–4, posterior area coarser ( Fig. 15View FIGURES 15 A); medianmesoscutal line and parapsidal line distinct; mesepisternum finely granular, upper area with transverse striation, lower area with a characteristic tubercle ( Fig. 6View FIGURES 3 – 8); metepisternum, lateral surface of propodeum with transverse striation; propodeal dorsum truncate apically, basal 2 / 3 with longitudinal ridges as in Fig. 7View FIGURES 3 – 8 and Fig. 15View FIGURES 15 C; the lateral and posterior surfaces of propodeum not separated by carina; MCL: MTL: PDL= 43: 15: 27.

WL= 7.2 mm. Fore wing with veins 1 r-m, 2 r-m, 2 m-Cu, and M-b narrower than Rs-a and M-a; 2 r-m, 2 m-Cu and M-b narrower than 1 r-m; hamuli arranged in 2 - 1-2.

Basitibial plate elongate oval, pointed apically; inner hind tibial spur with 4 distinct, fastigiated, pectinate teeth ( Fig. 8View FIGURES 3 – 8).

Metasoma elongate oval. Posterior areas of T 1 –T 5 straight forwards with transverse weak wrinkle. T 1 with fine and sparse punctures, nearly smooth anteriorly, middle area IS= 1; T 2 medially as coarse as T 1, laterally finer; T 3 and T 4 IS= 2–3; T 5 IS= 2; T 6 hidden in T 5 below, with U-shaped pygidial plate; sting L= 1.5 mm.

Male. Unknown.

Type material. Holotype, Ƥ, China, Chongqing, Wanzhou District, Wan Er bao Nature reserve, 30 ° 80 ʹN 108 ° 40 ʹE, 1200m, 11 July 1993, Jian Yao. Paratype, 1 Ƥ, China, Chongqing, Wanzhou District, Wan Er bao Nature reserve, 30 ° 80 ʹN 108 ° 40 ʹE, 1200m, 11 July 1993, Jian Yao.

Type series are deposited in the Insect Collections of Institute of Zoology, Chinese Academy of Sciences, Beijing, China.

Distribution. China (Chongqing).

Etymology. The name genotrigonum  is derived from the Greek gen- (= genal) and Greek trigonum (= triangular), referring to genal area nearly triangular.


University of Modena and Reggio Emilia, Department of Biology