Epichlorops yunnanensis, Cui, Yusi & Yang, Ding, 2009

Cui, Yusi & Yang, Ding, 2009, Species of Epichlorops Becker from China (Diptera, Chloropidae), Zootaxa 2017, pp. 41-46 : 42-45

Epichlorops yunnanensis sp. nov.

( Figs. 1–9 )

Diagnosis. Frons nearly as wide as long, projecting only slightly in front of eye; ocellar triangle dark brown, with narrow black projection continuing anteriorly to margin of frons, each posterior corner demarcated by a yellow spot around base of vte. 3rd antennal segment brown. Scutum black except for yellow lateral margins and reddish-brown area, covered with dense pale setae arising from star-shaped tubercles.

Description. Body length 1.9–3.0 mm. Wing length 1.9–2.9 mm.

Head about 0.7 times as long as high, mainly yellow. Face concave in lateral view; frons orange-yellow, nearly as wide as long, projecting only slightly in front of eye; occiput dark brown; gena narrowed, about 0.4 times as high as 3rd antennal segment, vibrissal angle 90°. Ocellar triangle dark brown, smooth, main portion of triangle only two-thirds as long as frons, lateral margins convex, with narrow black projection continuing anteriorly to margin of frons, and each posterior corner demarcated by a yellow spot around base of vte; ocellar tubercle black. Setae and setulae on head black. Oc proclinate and divergent; vte and vti developed. Eyes bare. Antennal 1st and 2nd segments brown, 3rd segment nearly rounded, dark brown; arista black with long setulae. Proboscis yellow with yellow setulae; palpus yellow to blackish with pale setulae.

Thorax slightly broader than head. Scutum about 1.25 times as long as wide, black except for yellow lateral margins, covered with dense pale setae arising from tubercles, giving scutum a coarsely punctuate appearance, with 5 black stripes, the median stripe located anteriorly, and separated from inner lateral stripe by a narrow reddish-brown area, the inner lateral stripe separated from outer lateral stripe by a yellow area; scutellum yellow, about 1.5 times as wide as long; postnotum black. Thoracic pleuron shinning yellow except for postpronotum and anteroventral region of anepisternum each with a black spot; anepimeron occasionally with a faint yellow-brown spot on anteroventral region; katepisternum and katepimeron with black lower portions, and katepimeron not shinning. Setae and setulae on thorax black. Legs long and thin; coxae yellow, femora yellow-brown, tibiae yellow-brown or yellow-brown with a brown spot medially, tarsomeres 1–5 brown to dark brown. Wing hyaline, veins dark brown. Relative lengths of costal sections 2nd: 3rd: 4th = 20: 35: 21. Squama yellow with yellow setulae. Halteres bright yellow.

Abdomen dark brown dorsally, yellow laterally and ventrally. Tergum 5 dark brown with a yellow posterior margin. Setulae on abdomen black.

Male genitalia ( Figs. 4–6 ): epandrium brownish yellow, darker dorsomedially, and with black setulae; surstylus short, less than half as long as height of epandrium, with posterior region long finger-like and curved backward, dark, granulate; mesolobus oviform; hypandrium relatively broad in lateral view, short and convex anteriorly, with small medial indentation; pregonite shorter than gonostylus, with rounded posterior apex; gonostylus with wide anterior margin, tapered and rounded posterior region, and with 5–6 ventral setulae in anterior half.

Female similar to male. Body length 2.8–3.0 mm. wing length 2.7–2.9 mm.

Female genitalia ( Figs. 7–9 ): brownish yellow, tergum 9 with projected posterior margin, and two pairs of long pale setulae; sternum 9 broad with dense posterior setulae; cercus brown, with rounded tip, covered with long pale setulae densely.

Type material. Holotype male, CHINA: Yunnan, Tengchong, 31. V. 2007, Xingyue Liu. Paratypes 1 male 2 females, same as holotype; 2 males, same locality as holotype, 20. V. 2006, Xingyue Liu; 1 male, same locality as holotype, 16. V. 2006, Yajun Zhu.

Distribution. China (Yunnan).

Remarks. The new species is somewhat similar to Epichorops scaber (Coquillett) from USA in having the ocellar triangle smooth and shinning, the main portion of the triangle only two-thirds as long as the frons, with the narrow black projection continuing anteriorly to the margin of the frons; the stripes on the scutum separated by the reddish-brown area; the hypandrium relatively broad in lateral view, short and convex anteriorly, with the small medial indentation. But it can be separated from the latter by the brown 3rd antennal segment, the surstylus with posterior region long finger-like and curved backward; the gonostylus with the anterior margin wide and the posterior region tapered and rounded. In E. scaber (Coquillett) , the 3rd antennal segment is orange-yellow basally and ventrally, black distally and dorsally; the posterior region of the surstylus is rounded; the gonostylus is uniformly broad for most of the length ( Wheeler, 1994).

Etymology. The species is named after the type locality Yunnan.

Figures

FIGURES 1 – 9. Epichlorops yunnanensis sp. nov. Male. 1. Head, dorsal view; 2. antenna, lateral view; 3. mesonotum, dorsal view; 4. epandrium, lateral view; 5. epandrium, posterior view; 6. hypandrium and phallic complex, ventral view. Female. 7. Terminalia, dorsal view; 8. terminalia, lateral view; 9. terminalia, ventral view.