Psilota bashanensis Huo and Zhao, 2022

Zhao, Le, Liu, Xin, Smit, John T., Li, Gang, Liu, Han-Yue, Dang, Li-Hong & Huo, Ke-Ke, 2022, A new species of the genus Psilota Meigen, 1822 (Diptera: Syrphidae) from China, Zootaxa 5154 (2), pp. 225-238 : 228-230

Psilota bashanensis Huo and Zhao sp. nov.

ZooBank link: http://zoobank.org/9054da35-d537-458d-8607-21a5a92137e4

BOLD link: dx.doi.org/10.5883/BOLD:AEK3637

Figs 1–16

Type material. HOLOTYPE: ♂, CHINA: Dabashan Mountains, Shaanxi Province, 107°23’E, 32°84′N, 23-III- 2021, collected by Le Zhao (depository: Museum of Zoology and Botany, Shaanxi University of Technology , China) . PARATYPE: 1 ♂ same data as holotype .

Diagnosis. Psilota bashanensis sp. nov. belongs to the P. innupta species-group sensu Smit & Vujić (2008). It is easily recognized by the faintly brown-tinted wing with a yellow stigma, the elongated basoflagellomere (1.8 times longer than wide), and the shiny pleura. Additional characters are black species with face heavily whitish microtrichose, eyes densely covered with long yellowish white pile, antennae inserted in upper half of the face in lateral view. Pleura shining and partly long light yellowish-brown pilose. Metafemur not swollen, carinate on posterior margin apicoventrally. Epandrium in lateral view almost 1.12 times wider than long. Surstylus about 1.19 times as long as length of the base of the epandrium, inner lobe lanceolate, gradually broadened towards the top; outer lobe shorter than inner lobe, curved, broader, and rectangular basally. Body length: Males, 7.0– 7.1mm (n=2). wing length: 5.5–5.6mm (n=2).

Description. MALE: Head ( Figs 1–4 , 6–8 ). Head black, face densely covered with whitish microtrichia ( Figs 2, 4 ). Face slightly inclined towards posterior in lateral view, about 2.4 times longer than frons and gradually broadened laterally downwards in frontal view, covered with yellowish white long pile laterally; frons small, mostly covered with long yellowish white pile and mixed with a few long black pile laterad to frontal prominence; gena long yellowish white pilose ( Figs 2, 4 , 6–7 ). Eyes holoptic, contiguity about 1.2 times the length of the frons, with dense long yellowish white pile ( Figs 1 , 6–7 ). Ocellar triangle equilateral. Ocellar triangle equilateral. Occiput black, covered with whitish pollinosity, light yellow short pile dorsally and a few long pile posterior to the ocellar triangle medially, a row of long black pile along with the posterior margin of eyes, and yellow to yellowish white pile laterally below. Occiput in lateral view narrowed dorsally and gradually broadened laterally. Vertex black, with a tuft of long yellowish white and black pile. Antenna black, black pilose on dorsal and ventral margins of scape and pedicel, basoflagellomere 1.8 times as long as wide, arista black and bare ( Figs 4 , 8 ). Thorax ( Figs 1, 3–4 ). Postpronotum black with long light yellowish-brown pile. Mesonotum longer than wide, slightly convex dorsally, shiny black, bronze metallic reflection with fine punctuation and long light yellowish-brown pile, sparse black pile posterior to transverse suture. Scutellum ( Figs 1 , 9 ) about twice as wide as long, with fine punctuation and apical marginal rim, shiny black, mixed long black and light yellowish-brown pile. Subscutellar fringe composed of long light yellowish-brown pile. Pleura shiny black with long light yellowish-brown pile on propleuron, anepisternum, posterior anepimeron and posterior katepisternum. Katepisternum without dorsal and ventral pile patches. Meron with a tuft of light yellowish-brown pile anteroventral to posterior spiracle. Metasternum black with long yellowish white pile. Postmetacoxal bridge absent. Legs ( Figs 1, 3 , 13 ). Legs black, blackish brown on the extreme apex of femora and the base of tibiae of pro- and mesolegs. Tarsi black, basal two tarsomeres slightly brownish. Proleg yellow pilose, except for the apical half of the profemur, posteriorly, bearing long black pile, and the protibial bearing mixed long black and light yellowish-brown pile posteriorly. The pile of mesolegs similar to that on the forlegs, except mesofemur with long yellowish-brown pile posteriorly and sparsely long black pile anteriorly, mesotibia with long black pile in posterior part. Metacoxa covered with long yellowish white pile. Metafemur covered with light yellow pile, longer in anterior part and apical part posterodorsally, a few short black spines apicoventrally. Metatibia covered with mixed long black and light-yellow pile, anterior margin of the basitarsus with long dark pile. Metafemur not swollen, distinctly ridged apically on the posteroventral margin. Wings ( Figs 1, 3, 5 , 15 ). Spurious vein absent, faintly brown-tinted, stigma yellow, covered with microtrichia except base of cells c and bm, anterior and posterior margin of cell bm, and anterior portion of cell cup. Vein R 2+3 straight, vein r-m at basal 1/4 of cell dm. The middle of the vein M 1 bulged outwards circularly without external spurs, joined with vein R 4+5 at acute angle. Vein dm-cu recessive anteriorly, forming a right angle with vein M ( Fig 15 ). Dorsal calypter light brown. Ventral calypter light grey-black, large and rounded. Plumula long, yellowish brown. Abdomen ( Figs 1, 3 , 9 ). Oval, black, abdominal segments 2, 3, and 4 nearly equal in length, abdominal tergites with fine punctuation and erect long light yellowish brown pile. Genitalia ( Figs 10–12, 14, 16 ). Epandrium shiny black and strongly sclerotized. Epandrium in lateral view almost 1.12 times wider than long ( Fig 11 ). In dorsal view, the middle of the posterior epandrium margin inwards formed a triangular depression ( Fig 12 ). Cercus elongate, petiolate, broad and rounded on apical half, finer on basal half, dark tawny with long light yellowish pile ( Figs 11–12 ). Surstyli, inner lobe at most 1.19 times the length of the epandrium, lanceolate, gradually broadened towards the top; outer lobe shorter than inner lobe, curved, broader and quadrangle basally, light to long dark pile on basal half ( Figs 10–12 ). Hypandrium shiny black and strongly sclerotized, elongated, tubular, broader basally and finer apically ( Fig 14 ). Superior lobe as a narrow band, broad and rounded at apex. Aedeagus ( Figs 14, 16 ) unsegmented, dorsal margin arcuated and formed an acute angle with ventral margin; ventral margin denticulate apically and joining basal margin approximately at right angle; aedeagal apodeme elongated triangles.

FEMALE. Unknown.

Etymology. The specific epithet refers to the type locality.

Distribution. Known only from Dabashan Mountains, Shaanxi Province, China.

Biology. Adults were collected in open areas of the Dabashan Mountains (107°23′E, 32°84′N, 600–680m asl) in 2021 ( Fig.17 ). They were visiting flowers of Microdesmis caseariifolia .

Figures

FIGURE 17. The ecological environment of Psilota bashanensis sp. nov. in the collection area.

FIGURES 1–5. Male holotype of Psilota bashanensis sp. nov. 1. habitus, dorsal view; 2. Head, frontal view; 3. habitus, left lateral view; 4. Head, left lateral view; 5. Right wing, dorsal view. Scale bars = 2 mm (1, 3, 5), 1 mm (2, 4).

FIGURES 6–16. Male of Psilota bashanensis sp. nov. 6. Head, lateral view; 7. Head, frontal view; 8. Right antenna, inside; 9. Scutellum and abdomen, dorsal view; 10 Genitalia, ventral view; 11. Genitalia, lateral view; 12. Epandrium and appendages, dorsal view; 13. metaleg, anterior view; 14. hypandrium and appendages, lateral view; 15. left wing, dorsal view; 16. Aedeagus. Scale bar = 1 mm.