Ensiferella elongata, Liu, Xiaoyan & Yang, Ding, 2012

Liu, Xiaoyan & Yang, Ding, 2012, Species of the genus Ensiferella Andersson from China, with a key to world species (Diptera, Chloropidae), Zootaxa 3207, pp. 54-62 : 55-57

Ensiferella elongata sp. nov.

(Figs. 1–7)

Diagnosis. Antenna black except scape yellow. Ventral 2/3 of katepisternum black, dorsal 1/3 yellow. Scutellum brown except middle 1/3 yellow. Legs yellow except fore tibiae and tarsi brown; mid and hind tarsomere 5 brown. Tergites 1–4 with a narrow triangular yellow spot. Hypandrium and phallic complex very long.

Description. Body length 2.5 mm, wing length 1.8 mm.

Head yellow without microtomentum, about 0.75 times as long as high, wider than thorax; face somewhat concave in lateral view, bright brown except middle 1/2 yellow; frons yellowish brown with posterior corner yellow, about as long as wide, projecting only slightly in front of eye, almost entirely occupied by broad ocellar triangle; gena linear, yellow with few yellow setulae; vibrissal angle obtuse; parafacial unconspicuous; clypeus light black. Ocellar triangle very large and broad, black, smooth, shiny with blue-green metallic shimmer, reaching to anterior margin of frons with pointed anterior apex; ocellar tubercle black. Occiput black. Cephalic setae and setulae black; if, orb short hair-like; oc, pvt hair-like, oc procurved and divergent; pvt procurved; vte developed, recurved and outcurved; vti weak, procurved, 0.5 times as long as vte. Antenna black except scape yellow with thick grayish microtomentum; postpedicel 0.5 times as long as wide; arista brown, basal 2 segments and basal portion of 3rd segment blackish brown. Proboscis brownish yellow with yellowish setulae; palpus black with black setulae.

Scutum almost as long as wide, yellow in ground color with 3 black longitudinal stripes, the medial stripe extending to posterior 7/10 of scutum, sparsely with gray microtomentum. Postpronotum yellow with a small brown spot. Thoracic pleuron shiny, yellow except paratergite brown; anteroventral portion of anepisternum with a black long spot, ventral 2/3 of katepisternum black, lower margin with some yellow setulae; ventral portion of katepimeron with a black spot; Postnotum black. Scutellum brown except middle 1/3 yellow, about 0.7 times as long as wide; ap sc short, distinctly shorter than scutellum. Setae and setulae on thorax black. npl 1+2, a npl and posterior p npl hair-like, anterior p npl developed; a pa strong, longer than p pa; 1 dc also strong, as long as a pa. Legs yellow except fore tibiae and tarsi brown; mid and hind tarsomere 5 brown. Setulae on legs brown. Tibial organ absent. Wing hyaline, about 2.5 times as long as wide; veins brown. Relative lengths of 2nd: 3rd: 4th costal sections = 12: 11: 4; discal cell narrow and long; r-m at basal 0.36 of discal cell. Halter brown.

Figures 1–4. Ensiferella elongata sp. nov., male. 1. epandrium, ventral view; 2. epandrium, lateral view; 3. hypandrium and phallic complex, ventral view; 4. hypandrium and phallic complex, lateral view. Abbreviations: basph – basiphallus; cer – cercus; distph – distiphallus; epd – epandrium; hyp – hypandrium; phap – phallapodeme; pog – postgonite; prg – pregonite; sur – surstylus. Scale bar = 0.1mm.

Abdomen shiny, yellowish brown except for tergite 1 yellowish, tergites 1+2 with a small black lateral spot, distal margins of tergites 2–4 blackish brown, tergites 1–4 with a narrow triangular yellow spot and yellow lateral margin; venter yellow. Setulae on abdomen brown.

Male genitalia (Figs.1–4): Epandrium short tubular, weakly sclerotized, with 2 band-like sclerites along posterodorsal notch. Surstylus basally broad, nearly triangular with an incurved apex, clothed with some small spinous processes, distally narrowed. Cercus semicircular with 6 pairs of setulae. Hypandrium and phallic complex very long, gonites arranged in a row; postgonite slightly incurved distally with blunt apex, with some sensory setulae, basally pointed; pregonite as long as postgonite, basally broad, distally narrowed; basiphallus narrow, cylindrical; distiphallus long, cylindrical, beyond lower margin of hypandrium; phallapodeme long, extended near base of basiphallus, with basal stalk broad in lateral view. Hypandrium narrowed.

Female similar to male. Body length 2.1–2.6 mm, wing length 1.3–1.8 mm.

Female genitalia (Figs. 5–7): Tergite 9 subtriangular, distinctly wider than long, with 2 long setae; sternite 9 long and apically round with long stout setae at apical portion. Cercus long and stout with some long setae. Type material. Holotype 3, CHINA: Yunnan: Mengla, 8. VIII. 2010, Hui Yu; paratypes 2 ♀ ♀, same data as holotype; 3 ♀ ♀, Mengla, 8. VIII. 2010, Wenliang Li. Hainan: 1 3, Wuzhishan, 29. V. 2007, Xingyue Liu. All type specimens were stored in 75% ethanol.

Figures 5–7. Ensiferella elongata sp. nov., female. 5. abdominal terminalia, dorsal view; 6. abdominal terminalia, lateral view; 7. abdominal terminalia, ventral view. Abbreviations: cer – cercus; s9 – sternite 9; t9 – tergite 9. Scale bar = 0.1 mm.

Distribution. China (Yunnan, Hainan).

Remarks. The new species is somewhat similar to E. sabroskyi Narshuk , but it can be separated from the latter by the following features: antenna black except scape yellow; legs yellow except fore tibiae and tarsi brown; distal margins of tergites 2–4 blackish brown, tergites 1–4 with a narrow triangular yellow spot. In E. sabroskyi , the antenna is yellowish brown except the basodorsal portion of the pedicel dark brown and the postpedicel yellow with the black dorsodistal portion; the legs are yellow except the fore tarsomeres 4–5 brown; the tergites 1+2 have a large semicircular yellow spot ( Nartshuk 1993).

Etymology. The specific name is from the Latin elongata (“long”), refers to long hypandrium and phallic complex of the new species.