Ctenosciara xijingensis Wu & Zhang

Wu, Hong, Zhang, Su-Jiong & Huang, Junhao, 2010, The genus Ctenosciara Tuomikoski in China, with descriptions of three new species (Diptera, Sciaridae), Zootaxa 2560, pp. 42-50 : 47-48

Ctenosciara xijingensis Wu & Zhang sp. nov.

Fig. 4 A–F

Specimens examined. Holotype, male. China, Zhejiang province, Hangzhou, Linan, Mt. Xijingshan, Chanyuan temple, 30°23΄N, 119°72΄E, sweep-net, 22.VI.2008, Su-Jiong Zhang [SM00066]. Paratypes. 2 males, same data as holotype, but 21.VI.2008 [SM00013–14]; 2 males, same data as holotype, but 21.VI.2008, Junhao Huang [SM00016, SM00031].

Description (Male). Body length: 1.57 mm. Color. Antenna bicolored, flagellomeres brown, scape and pedicel yellowish-brown; thorax, abdomen, hypopygium, and coxae yellowish-brown; palpus and legs yellow; wing fumose. Head ( Fig. 4 A, B). Eye bridge three facets wide. Prefrons with 14 setae. Palpus threesegmented, basal segment with three setae and an indistinct narrow sensory pit, 2nd segment with seven setae, 3rd segment with nine setae. Length of 4th flagellomere: 0.11 mm, length/width: 2.81. Thorax. Anterior pronotum with two setae, episternum1 with four setae. Apex of fore tibia with a comb-like row of setae, and subdivided into three parts ( Fig. 4 C). Length of spur/width of tibia: fore leg 1.89. Length of metatarsus/length of tibia: fore leg 0.53, mid leg 0.51, hind leg 0.36. Length of hind tibia/length of thorax: 1.78. Tarsal claws not toothed. Wings ( Fig. 4 D). Wing length 1.75 mm, width/length: 0.46. M1, M2, CuA1, CuA2, and r-m with setae. bM bare. R5 with dorsal and ventral setae from the intermediate part. stM weakly visible, without setae. Halter with two rows of setae. c/w: 0.70. R1/R: 0.84. r-m/bM: 0.85. Hypopygium. Gonostylus rather slender, slightly attenuated apically, and with distinct apical tooth and six subapical megasetae ( Fig. 4 F). Tegmen quadrangular, with very fine aedeagal teeth; aedeagal apodeme small and short ( Fig. 4 E).

Female. Unknown.

Remarks. The new species is similar to C. rufulenta and C. insolita in having setae on r-m (setose in some individuals of C. rufulenta ) and CuA2; R5 with both dorsal and ventral setae; and gonostylus rather slender, slightly attenuated apically, with 5–8 subapical megasetae. It is distinguished by having a quadrangular tegmen and R5 with dorsal and ventral setae only on the apical half. The species is about 1.57 mm in body length, and is smaller than both C. rufulenta and C. insolita , which are 2.2–3 mm. Moreover, stM is setose in C. insolita , but bare in C. xijingensis .

Etymology. The species is named after its type locality (Mt. Xijingshan).

Figures

FIGURE 4. Ctenosciara xijingensis Wu & Zhang sp. nov., male. A, palpus, lateral view; B, 4 th flagellomere, lateral view; C, apex of front tibia, prolateral view; D, wing, dorsal view; E, part of hypopygium, ventral view; F, right gonostylus, ventral view. Scale 1.0 mm for D, 0.1 mm for the others.