Scaptodrosophila riverata (Singh & Gupta , 1977 )

Lin, Yong & Chen, Hong-Wei, 2020, The genus Scaptodrosophila Duda (Diptera, Drosophilidae), part III: the riverata species group from China, with morphological and molecular evidence for five new species, ZooKeys 937, pp. 139-162 : 139

Scaptodrosophila riverata (Singh & Gupta, 1977)

Figs 3A, C, E , 7

Drosophila riverata Singh & Gupta, 1977: 240.

Material examined.

China: 2♂ (SCAU, Nos 126828, 29), Banli, Chongzuo , Guangxi, alt. 160 m, 21.viii.2004, HW Chen ; 1♀ (SCAU, No. 126830), Ailaoshan, Jingdong , Yunnan, 24°32'N, 101°00'E, alt. 2100 m, 21.vi.2009, T Li ; 3♂ (SCAU, Nos 110913-15), Likan, Ximeng , Yunnan, 22°39'N, 99°36'E, alt. 844 m, 1.v.2016, YQ Liu ; 1♂, 1♀ (SCAU, Nos 110916, 17), Huanglianshan, Lüchun, Yunnan, 23°20'N, 102°23'E, alt. 600 m, 28.x.2018, HW Chen .

Diagnosis.

Surstylus bifid, the upper lobe with about 5 thin, peg-like prensisetae and 1 fine seta, the below one with 1 thin, peg-like prensiseta and 2 fine setae (Fig. 7A, B ); gonopods undeveloped (Fig. 7C, D ).

Description.

(♂, ♀) Head (Fig. 3A ): Frons yellowish brown. Pedicel and first flagellomere maple. Facial carina yellowish, short, 1/3 length as face.

Thorax (Fig. 3C, E ): Mesonotum and scutellum yellowish. Acrostichal setulae in ca 8 regular rows. Wings hyaline.

Abdomen (Fig. 3C, E ): Tergites and sternites yellowish.

Male terminalia: Epandrium with ca 14 setae near posterior margin and ventral corner on each side (Fig. 7A, B ). Hypandrium glabrous (Fig. 7C, D ). Paramere slender and curved apically, with 3 sensillae subbasally (Fig. 7C, D ).

Female terminalia (Fig. 7E ): Oviscapt with 2 long subapical trichoid ovisensilla, 17 peg-like ovisensilla on each side on ventral margins and 5 trichoid ovisensilla on dorsal.

Measurements (range in 2♂, 1♀, in mm): BL = (1.73-2.07, 1.93 mm), ThL = (0.80-1.07, 0.80), WL = (1.80-2.27, 1.93), WW = (0.67-0.93, 0.80).

Indices: arb = 2/1, avd = 0.60-1.00, adf = 2.00-2.50, flw = 2.00, FW/HW = 0.45-0.48, ch/o = 0.08, prorb = 0.80-0.83, rcorb = 0.40-0.60, vb = 0.33-0.50, dcl = 0.54-0.60, presctl = 0.45-0.60, sctl = 1.00-1.10, sterno = 0.67-0.75, orbito = 0.67-0.75, dcp = 0.30-0.40, sctlp = 0.83, C = 2.42-2.92, 4c = 1.00-1.20, 4v = 2.17-2.60, 5x = 1.50-2.00, ac = 2.40-3.00, M = 0.67-0.80, C3F = 0.25-0.33.

Distribution.

China (Guangxi, Yunnan), India, Myanmar.

Figures

Figure 3. Head, mesonotum, scutellum, pleura and abdomen of male. A, C, E S. riverata (Singh & Gupta, 1977) B, D, F S. puncticeps (Okada, 1956). Scale bars: 0.5 mm.

Figure 7. Scaptodrosophila riverata (Singh & Gupta, 1977) ♂. A Epandrium, surstylus and cercus (posterior view) B surstylus (lateral view) C hypandrium, aedeagus, aedeagal apodeme, paramere and gonopods (ventral view) D hypandrium, aedeagus, aedeagal apodeme, paramere and gonopods (lateral view) E oviscapt (lateral view). Scale bars: 0.1 mm.