Zygoneura (Pharetratula) disparilis 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

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

Specimens examined. Holotype, male. China, Yunnan province, Yingjiang, Tongbiguan nature reserve, 24°36.004΄N, 97°39.139΄E, 16.V.2009, Su-Jiong Zhang [SM00789]. Paratype. 2 Males, the same data as the holotype [SM00824, SM00919]. Wings and mid-legs are broken and missing in the holotype. All the wings and legs are missing in the paratypes.

Description (Male). Body length 2.33 mm. Color: Head dark brown; antenna, thorax, coxae, abdomen, and hypopygium yellowish-brown; palpus and legs yellow; wing fumose. Head ( Fig. 1 A, B): Eye bridge broad, with three rows of facets. Prefrons with six setae. Palpus three-segmented, basal segment with two setae, 2nd segment with four setae, 3rd segment with six setae. Flagellomeres mostly bearing short setae, except one row of remarkably long setae around the neck. The 4th flagellomere 0.14 mm in length, length/ width: 3.5, flagellomere neck 0.08 mm, nearly 1/2 of the length of the flagellomere. Thorax: Posterior pronotum and mediotergite bare. Scutellum with one seta. Apex of fore tibia with a narrow comb-like row of setae ( Fig. 1 C). Length of spur/width of tibia: fore leg 1.39. Length of metatarsus/length of tibia: fore leg 0.53. Length of hind tibia/length of thorax: 1.37. Tarsal claws three-toothed. Wings ( Fig. 1 D): M1, M2, CuA1, r-m with no setae. stM well visible. Terminalia: Ventral mesial margin of the gonocoxa with two evident groups of setae ( Fig. 1 E). Gonostylus almost as long as gonocoxa, with two megasetae at the middle of the inner side, of unequal length ( Fig. 1 F). Tegmen simple, much broader sub-basally than subapically.

Female. Unknown.

Remarks. The species belongs to the subgenus Pharetratula . It is similar to the species Z. flavicornis Mamaev, 1968 and the species Z. bidens in having a pair of megasetae ( Mamaev 1968), but can be recognized by the gonostylus attenuated at the apex, and two megasetae on a shorter dorsal lobe, of unequal in length.

Etymology. The species is named after its distinctive megasetae.

Figures

FIGURE 1. Zygoneura (Pharetratula) disparilis Zhang & Wu, sp. nov., male. A, 4 th flagellomere, lateral view; B, palpus, lateral view; C, apex of front tibia, prolateral view; 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.