Clusia luteimacula, Shen & Zhu & Liu & Yang & Xi, 2023

Shen, Shuang, Zhu, Yongqiang, Liu, Chang, Yang, Ding & Xi, Yuqiang, 2023, First records of the druid fly genus Clusia Haliday, 1838 (Diptera, Clusiidae), with two new species from China, Zootaxa 5257 (1), pp. 123-130 : 125-126

Clusia luteimacula sp. nov.

( Figs 1, 3 , 5–10 )

Diagnosis. Head ( Figs 1 , 5 ) mostly yellowish, with one pair of dark brown dorsal stripes; antenna yellowish (dorsal 1/3 of postpedicel and arista except base of verticals); front with two brown subtriangular markings and connected. Thorax yellow with six black-brown stripes, median stripe along dorsocentral seta, sublateral ones just inside of supra-alar lines and with median stripe connected, lateral ones from postpronotal lobes to notopleura. Scutellum black-brown with a wide central yellow stripe. Legs yellow, mid tibia without preapical dorsal setae. Wing with fuscous anterodistal spot, covering distal 1/4 of R 2+3. Abdomen brown; surstylus longer and without setae on inner and outer face; hypandrium with a row of setulae and four pores under the setulae, pregonite with three longer setae and four shorter setae at the root.

Description. Male. Body length 6.1–6.2 mm, wing length 5.8–6.0 mm.

Head ( Figs 1 , 5 ) yellowish; palpus, face and frons yellow, three fronto-orbitals, the first fronto-orbital seta from inclines inward; one inter-frontal seta; occiput yellow in the middle and brown subtriangular markings on both sides; gena mostly yellow and almost without seta, a row of setae on the lower edge of the eye; gena more than 1/3 as high as eye; antenna yellowish, antenna dorsal 1/3 of postpedicel and arista except base of vertical spale brown spot surrounding base of arista, arista brown, sparsely short plumose; one postocellar seta and one ocellar seta; fronstal with two brown subtriangular markings and connected, a brown subtriangular markings on the front of the postocellar seta; a brown subtriangular markings on the inter-frontal and some setae around the inter-frontal.

Thorax ( Fig. 3 ) yellow with six brown stripes, the middle two stripes are longer, extending from the pronotum plate to the scutellum anterior, the stripes along dorsocentral seta; sublateral ones shorter, just inside of supra-alar lines, extending from the seam of the scutal to the scutellum until fused with the middle, lateral ones from postpronotal labes to notopleura; scutellum yellow in the middle and black-brown markings on both sides; anepisternum and katepisternum yellow. Prescutellar acrostichal seta absent; one postpronotal seta, two notopleural setae, one posutural supra-alar seta, two dorsocentral setae, dark brown; one intra-alar seta, two postalar setae, the posterior seta is 1/3 of the anterior setae, dark brown; two lateral scutellar setae, one apical scutellar seta, dark brown; one anepisternal seta, one katepisternal seta. Legs yellow, tibiae and tarsi very slightly brownish; mid femur with one posterior rows of ventral setae and preapical dorsal seta absent. Wing ( Fig. 6 ) with complete subcosta and with large dark brown spots along veins R 2+3, R 4+5 and M 1, covering distal 1/4 of R 2+3, the M 1 ratio: distal portion of M 1 1.7 times as long as dm-m. Halter white.

Abdomen brown; setae and setulae on abdomen dark brown; tergites 1–3 dark yellow, with inverted T-shaped patch, tergite 3 with yellow spots in the middle, which are as 1/3 area as tergite 3, approximately subtriangular markings, tergite 4 with dark yellow spots in the middle, approximately subtriangular markings, tergite 5 with brown lower margin; sternites yellow. Male genitalia ( Figs 7–10 ): 2/3 of the epandrium brown, the rest is yellow, epandrium high and wide almost the same length. Cerci approximately 1/4 of surstylus length, W-shaped, 0.7 times longer than wide, with many setae and three long setae. Surstylus about 1/3 of epandrium length; surstylus without setae on inner and outer face, having no spines. Hypandrium with a row of setulae and four pores under the setulae, pregonite with three setae and four setae at the root, phallapodeme well developed, the apex is large and protruding; distipallus relatively long, narrower at the distal end.

Female. Unknown.

Type material. HOLOTYPE male, CHINA, Chongqing, Yintiaoling Nature Reserve, Mt. Guanshan, Maizitang 2168m, 31°28′N 109°47′E, 2022.VIII.17. Xulong Chen . PARATYPE: 1 male, same data as holotype .

Distribution. China (Chongqing).

Etymology. The specific name is a combination of “ lute- ” (yellow) and “ maculus ” (spotted), referring to the yellow spotted abdomen, feminine.

Remarks. The new species is similar to C. sinensis sp. nov. ( Figs 2, 4 , 11–16 ), but it can be separated from the latter by the frons with two brown subtriangular markings and connected; the wing with large dark brown spots along the R 2+3, R 4+5 and M 1, covering distal 1/4 of R 2+3; one postocellar seta; hypandrium with a row of setulae and four pores under the setulae; pregonite with three setae and four setae at the root. In C. sinensis sp. nov., the frons with stripe extending from ocellar tubercle; the wing with brown spots along the R 2+3 and R 4+5, and with a small fainter spot subapically on M 1, covering distal 1/5 of R 2+3; postocellar seta absent; abdomen with light yellow markings; hypandrium with one shorter seta; pregonite with three longer setae and three shorter setae. The new species also is similar to C. sexlineata , in which surstylus conical with 12–18 spine-like setae and some setulae on inner apical part; pregonite membranous, with two setae ( Sasakawa 2011; Frey 1960).

Figures

FIGURES 1–4. Dorsal view of head and thorax (male). 1, head of C. luteimacula sp. nov.); 2, head of C. sinensis sp. nov.; 3, thorax of C. luteimacula sp. nov.; 4, thorax of C. sinensis sp. nov.. Scale bars: 0.5mm.

FIGURES 5–10. Clusia luteimacula sp. nov. (male). 5, head, lateral view; 6, wing; 7, epandrium, cerci, and surstylus, posterior view; 8, epandrium, cerci, and surstylus, lateral view; 9, hypandrial complex, posterior view; 10, hypandrial complex, lateral view. Scale bars: 0.5mm.Abbreviations: Sc = subcostal vein; R1 = anterior branch of radius; R2+3 = second branch of radius; R 4+5 = third branch of radius; M1 = first branch of media; M4 = fourth branch of cubital vein; CuA + CuP = anterior branch of cubital vein + posterior branch of cubital vein; bm = basal medial cell; cua = anterior cubital cell; dm = discal medial crossvein; r - m = radial - medial crossvein; dm - m = discal medial cubital crossvein; epand = epandrium; cerc = cerci; sur = surstylus; phapod = phallapodeme; hypd = hypandrium; distph = distiphallus; pregt = pregonite; epiph = epiphallus.

FIGURES 11–16. Clusia sinensis sp. nov. (male); 11, head, lateral view; 12, wing; 13, epandrium, cerci, and surstylus, posterior view; 14, epandrium, cerci, and surstylus, lateral view; 15, hypandrial complex, posterior view; 16, hypandrial complex, lateral view. Scale bars: 0.5mm.