Biema wanglangensis Huo & Zhao & Mengual & Liu & Zhao & Chen 2022, gen. et sp. nov

Biema wanglangensis Huo & Zhao gen. et sp. nov. urn:lsid:zoobank.org:act: E468D3B0-C9CC-41E7-A092-61F4E55BBF08 Figs 2–23 Diagnosis Mesonotum sparsely light yellow pollinose, only thickened on lateral sides before transverse suture; pleuron and scutellum sparsely pollinose; male tergite 4 with dark brown or yellow broad median fascia; female tergites 3 and 4 with yellow fasciae, not extended to the anterior margin; female tergites 5 to 7 with yellow maculae basolaterally. Etymology The specific name is derived from the locality where type specimens were collected. Material examined Holotype CHINA • ♂; Sichuan Province, Pingwu County, Wanglang Natural Reserve; 4 Aug. 2016; Ke-Ke Huo leg.; sub-alpine forest; specimen identifier: SYR-2016080001; SNUT. Paratypes CHINA • 6 ♂♂, 1 ♀; same collection data as for holotype; specimen identifiers: SYR-2016080002 to 2016080008; SNUT • 4 ♂♂, 3 ♀♀; same collection data as for holotype; Fei Lan Leg.; specimen identifiers: SYR-2016080009 to 2016080015; SNUT • 1 ♂, 1 ♀; same collection data as for holotype; 5 Aug. 2016; specimen identifiers: SYR-2016080016 to 2016080017; SNUT • 1 ♂; same collection data as for holotype; 5 Aug. 2016; Fei Lan Leg.; specimen identifier: SYR-2016080018; Genbank: ON067497; SNUT • 11 ♂♂; same collection data as for holotype; 6Aug. 2016; specimen identifiers: SYR-2016080019 to 2016080029; SNUT • 1 ♂; same collection data as for holotype; 5 Aug. 2017; specimen identifier: SYR-2016080030; SNUT • 1 ♂, 2 ♀♀; same collection data as for holotype; 6 Aug. 2017; Yan Bai leg.; specimen identifiers: SYR-2016080031 to 2016080033; ZFMK • 1 ♀; same collection data as for holotype; 6 Aug. 2017; Yan Bai leg.; specimen identifier: ZFMK-DIP-00097116; photographed in Figs 5–7; SNUT • 17 ♂♂; same collection data as for holotype; 9 Aug. 2017; specimen identifiers: SYR-2016080034 to 2016080050; ZFMK • 1 ♂; same collection data as for holotype; 9 Aug. 2017; specimen identifier: ZFMK-DIP-00097117; photographed in Figs 2–4; SNUT • 7 ♂♂; same collection data as for holotype; 9 Aug. 2017; Yan Bai leg.; specimen identifiers: SYR-2016080051 to 2016080057; SNUT • 3 ♂♂, 2 ♀♀; same collection data as for holotype; 10 Aug. 2017; specimen identifiers: SYR-2016080058 to 2016080062; ZFMK • 1 ♂, 1 ♀; same collection data as for holotype; 10 Aug. 2017; specimen identifiers: ZFMK-DIP-00097118 and ZFMK-DIP-00097119; SNUT • 1 ♀; same collection data as for holotype; 10 Aug. 2017; Yan Bai leg.; specimen identifiers: SYR-2016080065; SNUT. Description Male (Figs 2–4, 8–9, 11–12, 14–23) MEASUREMENTS. Body length: 5 mm. Wing length: 5mm. HEAD (Figs 2–4, 8–9, 11). Hemispherical, deeply concave posteriorly with a concealed postpronotum. Eye bare, with eye contiguity longer than frons. Vertex slightly convex, black, yellow pilose and pollinose. Ocellar triangle equilateral, located at the anterior half of vertex. Occiput densely yellow pilose and pollinose on dorsal and upper half of lateral portions, yellowish white pilose and pollinose on lower half, obscures ground colour. Frons densely white pollinose obscures ground colour, short light pile along the margins. Lunule narrow, light yellowish brown. Face almost vertical in lateral view, facial tubercle rounded and produced, anterior margin of oral open not pointed. Face black and densely white to light yellow pollinose obscures ground colour, facial tubercle and lateral oral margins shiny black and bare. Face short light pilose laterally. Gena densely light yellowish white pilose and pollinose. Antennal sockets confluent. Antenna light yellow; basoflagellomere dark brown dorsally; arista dark brown with extremely short pile, thickened basally. THORAX (Figs 2–3). Black. Mesonotum metallic golden green, with subappressed short yellow pile; sparsely light yellow pollinose, thickened on lateral sides before transverse suture. Postpronotum light yellow pollinose. Scutellum shining black, metallic green, with subappressed short yellow pile, row of light yellow bristle-like pile on posterior margin and two pile elongated in middle. Subscutellar fringe short and sparse, absent medially. Pleuron shining black, light yellow pollinose. Posterior convex part of anepisternum and anterior anepimeron sparsely short yellow pilose. Katepisterum sparsely short yellow pilose, only with ventral pile patches. Metasternum not reduced, posterior margin shallowly concave similar to that in Platycheirus, yellow, bare. LEGS (Figs 2–4). Light yellow to yellowish white; two apical tarsomeres of mid-tarsi light brown; hindtibiae, hind-tarsi and apical ½ of hind-femora black to blackish brown, hind-knees and apical of hindtibiae light yellow. Legs yellow pilose, apcial three tarsomeres of tarsi dorsally black pilose. WING (Figs 2–3, 14). Transparent, stigma light yellow, membrane entirely microtrichose. Vein R 4+5 straight, spurious vein rudimentary, corssvein r-m slightly inclined, located before the basal ⅓ of cell dm. Vein M 1 bent basally and formed s-shaped slightly. Vein M 1 and vein dm-cu parallel with wing margin. Alula narrow, as wide as basal width of cell c. Calypters narrow, yellowish white. Halters yellowish white, except yellowish green apically. ABDOMEN (Figs 2–3, 12). Male abdomen parallel-sided, slightly constricted at tergite 2 posterior margin, broadened from tergite 3 and widest part at end of tergite 4, postabdomen conspicuous more swollen than other segments. Tergite 2 slightly longer than tergite 3, and tergite 3 slightly longer than tergite 4. Abdomen blackish brown, yellowish white to yellow laterally; tergite 2 with two triangular yellow markings merged into yellow lateral margin and broadly separated on inner end; tergite 3 with broad median yellow fascia, sometime interrupted medially; tergite 4 with dark broad median brown fascia, sometimes absent.Terminalia yellowish brown.Tergites with light yellow pile on lateral margin, appressed black pile medially. Sternites light pilose; sternites 1 and 2 yellowish white, 3 and 4 brownish yellow. MALE TERMINALIA (Figs 15–23). Dark brown. Cercus small, weakly sclerotized, with yellow pile. Epandrium nearly quadrilateral in lateral view, broad slightly longer than high, basal margin broader than apical margin. Surstylus triangular in dorsal view, broadened basally, then gradually narrowed ventrad, with apex acute, and bent posterodorsally; in posterior view expanded into broad triangle towards middle line along posterior margin of epandrium, with pile on inner margin. Hypandrium circular and expanded basally, with transparent circular membrane area on postmedial portion ventrally, without lingula. Postgonite divided into dorsal and ventral branches, dorsal branch broadly striped, transparent on margins, with circular apex, bent posteroventrally in middle right angled. Ventral branch narrowly striped, expanded posteroventrally. Phallus unsegmented, with 2 ridges dorsally, apical end of ridges pointed. Female (Figs 5–7, 10, 13) MEASUREMENTS. Body length: 5 mm. Wing length: 5 mm. HEAD (Figs 5–7, 10). Vertex and frons densely gray yellow pollinose and yellow pilose, with blackish brown spot in front of lunule. Antenna dark brown. LEGS. Tarsi with black pile dorsally. ABDOMEN (Figs 5–6, 13). Abdomen parallel-sided, blackish brown, yellow laterally. Tergite 1 yellow or dark brown. Tergite 2 with lateral yellow markings medially, separated at inner ends and merged into lateral yellow. Tergites 3 and 4 with broad anterior yellow fasciae, with its anterior and posterior margins projecting medially. Tergites 5 to 7 yellow laterally. Sternites yellowish white, with light pile. Female terminalia brownish yellow. Remainder similar to male. Immature stages Unknown. Distribution This species was collected from sub-alpine forest at Wanglang National Nature Reserve, Pingwu County, Sichuan Province, China (103º55′− 104º10′ E, 32º49′− 33º02′ N, 2300−4980 m a.s.l.) during 2016–2018 (Fig. 24).
Published as part of Huo, Ke-Ke, Zhao, Le, Mengual, Ximo, Li, Gang, Liu, Xin, Zhao, Lian-Jun & Chen, Zhen-Ning, 2022, Biema Huo & Zhao gen. nov., a new flower fly genus (Diptera, Syrphidae) from China, pp. 98-116 in European Journal of Taxonomy 852 on pages 102-106, DOI: 10.5852/ejt.2022.852.2015, http://zenodo.org/record/7471148