Clusia sinensis, 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 : 126-129

Clusia sinensis sp. nov.

( Figs 2, 4 , 11–16 )

Diagnosis. Head ( Figs 2 , 11 ) mostly yellowish, with one pair of dark brown dorsal stripes; antenna yellowish (dorsal 1/2 of postpedicel and arista except base of verticals). Thorax ( Fig. 4 ) yellow with six brown stripes, median stripe along dorsocentral seta, sublateral ones just inside of supra-alar lines, lateral ones from postpronotal lobes to notopleura. Scutellum with a wide central yellow stripe and brown on both sides. Legs yellow; mid tibia without preapical dorsal seta. Wing ( Fig. 12 ) with fuscous anterodistal spot, covering distal 1/4 of R 2+3. Abdomen brown; surstylus ( Figs 13, 14 ) long and without setae on inner and outer face, without spines; hypandrium ( Figs 15, 16 ) with one short seta; pregonite ( Figs 15, 16 ) with three longer setae and three shorter setae.

Description. Male. Body length 5.3–5.5 mm, wing length 5.5–5.7 mm.

Head ( Figs 2 , 11 ) yellowish; palpus, face and frons light yellow; three fronto-orbital setae, the first frontoorbital seta from inclines inward; one inter-frontal seta; head with one pair of dark brown dorsal stripes; gena and postgena mostly yellow and almost without setulae; gena more than 1/5 as high as eye; antenna yellowish (dorsal 1/2 of postpedicel and arista except base pale brown), arista dark brown, sparsely short plumose; one ocellar seta and postocellar seta absent.

Thorax ( Fig. 4 ) yellow with six brown stripes, the mid two stripes extending from the pronotum to the scutellum, the stripe along dorsocentral seta; sublateral ones shorter, just inside of supra-alar lines, lateral ones from postpronotal labes to notopleura; scutellum yellow in the middle and 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; one intra-alar seta, two postalar setae, the anterior setae 3 times longer than posterior setae; two lateral scutellar setae, one apical scutellar seta; one anepisternal seta, one katepisternal seta. Legs yellow, tibiae and tarsi very slightly brownish; mid femur with one posterior rows of ventral seta and preapical dorsal seta absent. Wing ( Fig. 12 ) with complete subcosta; 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, the M 1 ratio: distal portion of M 1 is 1.7 times longer than dm-m. Halter white.

Abdomen dark brown; setae and setulae on abdomen dark brown; tergites 1–3 with median spots on anterior; sternites yellow. Male genitalia ( Figs 13–16 ): The upper part of the epandrium brown, the lower part yellow, epandrium 1.3 times as high as wide. Cerci approximately 2/3 of surstylus length, W-shaped, 1.4 times as high as wide, with many setae and two long setae. Surstylus long and 1/3 length of epandrium; surstylus without setae on inner and outer face, having no spines. Hypandrium with one shorter seta, pregonite with three longer setae and three shorter setae, phallapodeme well developed, the top is large and protruding; distipallus is longer and narrower at the top.

Female. Unknown.

Type material. HOLOTYPE male, CHINA, Sichuan, Pingwu, Wanglang , 2909 m, 32°51′N 103°58′E, 2016. VII.29, Yuqiang Xi . PARATYPES: 1 male, CHINA, Shaanxi, Zhouzhi, Dudumen , 1740m, 2015.VIII.1. Xuankun Li ; 2 males, CHINA, Shaanxi, Zhouzhi, Mt. Taibai , 1648m, 33°53′N 107°46′E, 2014.VIII.17–18. Xuankun Li .

Distribution. China (Sichuan, Shaanxi).

Etymology. The specific name refers to China, referring to the firstly discovered species of Clusia in China.

Remarks. The new species is similar to C. omogensis (Sasakawa) , but it can be separated from the latter by the frons with stripe extending from ocellar tubercle; the gena is about 1/5 height of eye; the abdomen brown, with light yellow markings; the surstylus without setae on inner and outer face, spines absent; the pregonite with three longer setae and three shorter setae. In C. omogensis the frons very slightly brownish; the gena about 1/7 height of eye; the abdomen black, with distinctly testaceous markings; the surstylus is strongly incurved, with two processes; the pregonite with three long setae ( Sueyoshi 2006; Sasakawa 1965).

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 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.