Biema qilianensis Huo & Liu, 2022

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, European Journal of Taxonomy 852, pp. 98-116 : 107-110

Biema qilianensis Huo & Liu gen. et sp. nov.

urn:lsid:zoobank.org:act:D9DFD1A0-68B8-42E9-A50C-72F48AB60CC4

Figs 25–41

Diagnosis

Mesonotum densely pollinose, anterior area with one pair of inconspicuous submedial pollinose vittae extended posteriad of transverse suture; scutellum densely pollinose; male tergite 4 without macula or with a small yellow macula/fascia anteromedially; female tergites 2 to 7 with broad yellow fasciae, extended to the anterior margin of tergites.

Etymology

The specific name is derived from the locality where the type specimens were collected.

Material examined

Holotype CHINA • ♂; Qinghai Province, Menyuan County, Zhugu village, Sigou township ; 24 Jul. 2021; Ke-Ke Huo leg.; sub-alpine forest; specimen identifier: SYR-2021070001 ; SNUT.

Paratypes CHINA • 1 ♂; same collection data as for holotype; Xin Liu leg.; Genbank: ON067496 ; specimen identifier: SYR-2021070002 ; SNUT • 6 ♂♂; same collection data as for holotype; 28 Jul. 2021; Xin Liu leg.; specimen identifiers: SYR-2021070003 to 2021070008 ; SNUT • 1 ♂; Qinghai Province, Menyuan County, Xianmi village, Qihankai Nature reserve ; 30 Jul. 2021; Xin Liu leg.; specimen identifiers SYR-2021070009 ; SNUT • 1 ♀; Qinghai Province, Menyuan County, Xianmi village, Meihua township ; 30 Jul. 2021; Xin Liu leg.; specimen identifiers: SYR-2021070010 .

Description

Male ( Figs 25, 27–29, 31–41 )

MEASUREMENTS. Body length: 5 mm. Wing length: 5 mm.

HEAD ( Figs 25, 27–28 ). Hemispherical, deeply concave posteriorly with concealed postpronotum. Eye bare, with eye contiguity longer than frons. Vertex slightly convex, black, yellow pilose and pollinose. Ocellar triangle equilateral,located at 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 of lateral portions, obscures ground colour. Frons densely white pollinose obscures ground colour, short light pile along eye 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, densely white to light yellow pollinose obscures ground colour, facial tubercle and lateral oral margins shining 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. Black. Mesonotum metallic golden green, subappressed short yellow pilose, light yellow pollinose and thickened laterally, anterior area with one pair of inconspicuous submedial pollinose vittae extended posteriad of transverse suture. Postpronotum light yellow pollinose. Scutellum shining black, metallic golden green, subappressed short yellow pilose, row of light yellow bristle-like pile on posterior margin and two pile elongated in middle. Subscutellar fringe short and sparse, central area of posterior margin bare. 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, with posterior margin shallowly concave similar to that in Platycheirus , yellow, bare.

LEGS. Light yellow to yellowish white; two apical tarsomeres of mid-tarsi light brown; hind-tibiae, hindtarsi and apical ½ to ⅔ of hind-femora black to blackish brown, hind-knees and apical of hind-tibiae light yellow. Yellow pilose.

WING ( Fig. 31 ). Transparent, stigma light yellow, membrane entirely microtrichose. Vein R 4+5 straight, spurious vein rudimentary, corssvein r-m slightly inclined, located before 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 ( Fig. 29 ). Male abdomen parallel-sided, slightly constricted at tergite 2 posterior margin, broadened from tergite 3 and the widest part at the 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 yellow broad median fascia, sometime interrupted medially; tergite 4 without macula, sometime with median small yellow macula or fascia anteriorly. Terminalia yellowish brown. Tergites with light yellow pile on lateral margin and appressed black pile medially. Sternites light pilose; sternites 1 and 2 yellowish white, 3 and 4 brownish yellow.

MALE TERMINALIA ( Figs 32–41 ). Yellowish brown. Cercus small, weakly sclerotized, yellowish brown with yellow pile. Epandrium nearly quadrilateral in lateral view, slightly longer than high, with the dorsal margin slightly convex. Surstylus elongated, slightly expanded inwards basodorsally, narrowly stripelike in lateral view, dorsal and ventral margins at basal ⅔ nearly parallel, apical ⅓ bent posterodorsally, ventral margin with circularly concave, apical with two triangular dentate-shaped point, inner surface with short brown setae. Hypandrium rounded and enlarged, with short brown setae posteroventrally and concave posteromedial margin. Postgonite bluntly basodorsally with a prominent tooth in lateral view, posterior part divided into dorsal and ventral branches, dorsal branch blunt and broad apically, ventral branch slightly sharp apically with dentate-shaped towards midline. Phallus unsegmented, in lateral view bluntly rounded apically, in dorsal view enlarged medially, arc-shaped laterally, two dentateshaped apically, arc-shaped between dentate-shape.

Female ( Figs 26, 30 )

MEASUREMENTS. Body length: 5 mm. Wing length: 5 mm.

HEAD ( Fig. 26 ). Vertex and frons densely gray yellow pollinose and yellow pilose, with a blackish brown spot in the front of lunule. Antenna dark brown.

LEGS. Tarsi with black pile dorsally.

ABDOMEN ( Fig. 30 ). Abdomen parallel-sided, blackish brown, yellowish laterally. Tergite 1 yellow or dark brown. Tergite 2 with lateral yellow spots medially, separated at the inner ends and merged into lateral yellow. Tergites 3 to 7 with broad yellow fasciae, anterior border of fasciae contacts anterior margin of tergites, covering about ⅔ of tergites 3 and 4, about ½ of tergites 5 to 7. Sternites yellow with light pile. Remainder similar to male.

Immature stages

Unknown.

Distribution

This species was obtained from sub-alpine forest at Qilian Mountain National Park, Qinghai Province, China (102º24′ E, 37º7′ N, 2600–3248 m above sea level) ( Fig. 42 ).

Figures

Figs 25–41. Biema qilianensis Huo & Liu gen. et sp. nov. 25. Male, head in lateral view. 26. Female, head in frontal view. 27. Antenna, inside view. 28. Male, head in dorsal view. 29. Female, abdomen in dorsal view. 30. Male, abdomen in dorsal view. 31. Wing. 32. Male, terminalia in lateral view. 33. Male, epandrium and appendages in dorsal view. 34. Male, terminalia in ventral view. 35. Male, hypandrium and appendages in lateral view. 36. Male, epandrium and appendages in lateral view. 37. Male, superior lobe in lateral view. 38. Male, epandrium and appendages in ventral view. 39. Phallus in lateral view. 40. Phallus in dorsal view. 41. Phallus in ventral view.

Fig. 42. The ecological environment of Biema qilianensis Huo & Liu gen. et sp. nov. collection area in China.