Zygoneura (Pharetratula) longa Zhang & Wu

Zhang, Su-Jiong, Wu, Hong & Huang, Junhao, 2010, The genus Zygoneura Meigen in China, with descriptions of three new species (Diptera, Sciaridae), Zootaxa 2368, pp. 40-48 : 43-45

Zygoneura (Pharetratula) longa Zhang & Wu , sp. nov.

Specimens examined. Holotype, male. China, Zhejiang province, Lishui, Taishun, Mt. Wuyanling nature reserve, 28°01΄N, 120°38΄E, 04.VIII.2005, Yi-Ping Wang [SM00948]. Paratype. 1 Male, China, Zhejiang, Linan, Mt. Xijingshan nature reserve, Laodian, 30°23΄N, 119°43΄E, 21.XI.2008, Su-Jiong Zhang [SM00129]; 1 male, China, Fujian province, Mt. Wuyishan nature reserve, Xingcun, 27°46΄N, 118°02΄E, 17.IV.2009, Su- Jiong Zhang [SM00507].

Description (Male). Body length 2.31 mm. Color: The head is bleached, pale brown; antenna, thorax, coxae, abdomen and hypopygium yellowish-brown; legs yellow; wing fumose. Head ( Fig. 2 A, B): Eye bridge broad, with four rows of facets. Prefrons bearing eight setae. Palpus three-segmented, basal segment with two setae, 2nd segment with four setae, 3rd segment with four setae. Flagellomeres mostly bearing short setae, except one row of remarkably long setae around the neck. The 4th flagellomere 0.11 mm in length, length/ width: 2.7, flagellomere neck 0.06 mm, nearly 1/2 the length of the flagellomere. Thorax: Posterior pronotum with two setae. Mediotergite with three setae. Scutellum with no setae. Apex of fore tibia densely covered by disordered long setae ( Fig. 2 C): Length of spur/width of tibia: fore leg 1.33, mid leg 0.67, hind leg 1.03; length of metatarsus/length of tibia: fore leg 0.58, mid leg 0.55, hind leg 0.39; length of hind tibia/length of thorax: 1.13. Tarsal claws two-toothed. Wings ( Fig. 2 D): Wing length 1.38 mm, width/length: 0.41. r-m with two setae on dorsal side. M1, M2, CuA1 with no setae. stM not easily visible. c/w: 0.79. R1/R: 0.52. Terminalia: Ventral mesial margin of gonocoxa with two evident groups of setae ( Fig. 2 E). Gonostylus slender, with one subapical megaseta and another longer sub-basal megaseta in the inner side. Tegmen higher than broad ( Fig. 2 F).

Female. Unknown.

Remarks. The species belongs to the subgenus Pharetratula . It is similar to Z. divergens ( Mamaev, 1976) and Z. subdivergens ( Mohrig & Mamaev, 1990) , in the subapical and sub-basal megasetae ( Mamaev 1976; Mohrig et al. 1990), but the new species can be distinguished by the slenderer gonostylus and its two different megasetae, as well as the different tegmen. Moreover, the posterior pronotum has 1–2 setae in Z. longa , while it is bare in Z. subdivergens .

Etymology. The species is named after its slender gonostylus.

Figures

FIGURE 2. Zygoneura (Pharetratula) longa Wu & Zhang, sp. nov., male. A, 4 th flagellomere, lateral view; B, palpus, lateral view; C, apex of front tibia, prolateral; D, wing, dorsal view; E, part of hypopygium, ventral view; F, left gonostyle, ventral view. Scale 0.05 mm for C, 0.50 mm for D, 0.10 mm for the others.