Scaptodrosophila nigricostata, Liu & Gao & Chen, 2017

Liu, Yi-Qin, Gao, Qing-Song & Chen, Hong-Wei, 2017, The genus Scaptodrosophila Duda part I: the brunnea species group from the Oriental Region, with morphological and molecular evidence (Diptera, Drosophilidae), ZooKeys 671, pp. 87-118 : 95-97

Scaptodrosophila nigricostata sp. n.

Figs 5E-H , 13

Type material.

Holotype ♂ (SCAU, No. 128253): CHINA: Baihualing, Baoshan, Yunnan, alt. 1400 m, 7.vi.2011, ex tussocks, HW Chen. Paratypes: CHINA: 1♂, 4♀ (SCAU, Nos 128248-51, 128374), HW Chen, JJ Gao, same data as holotype; 1♂ (SCAU, No. 128254), Wangtianshu, Mengla, Yunnan, 21°47'N, 101°63'E, alt. 580 m, 23.iv.2007, HW Chen.

Diagnosis.

This species is similar to S. nigripecta sp. n. in the shape of the paramere and the pattern on the mesonotum (Fig. 13C, D ), but can be distinguished from the latter by having the mesonotum mostly yellow (Fig. 5G ), and the aedeagus slender and rod-like (Fig. 13C, D ); see under that species.

Description.

Male and female: Head (Fig. 5E ): frons yellowish brown with a brown band anteriorly. Pedicel yellowish brown; first flagellomere yellowish brown. Facial carina yellowish brown, short and broad, as 1/3 length as face.

Thorax (Fig. 5F, G ): mesonotum with three dark brown longitudinal stripes medially and sublaterally. Acrostichal setulae in ca. 8-10 irregular rows. Scutellum yellowish brown, dark brown near basal scutellar setae, pale at tip. Pleura brown to dark brown.

Abdomen (Fig. 5H ): all tergites yellowish brown with dark brown caudal bands, the caudal bands on tergites II and III narrowed medially.

Male terminalia (Fig. 13A-D ): epandrium with ca. 15 setae near posterior and ventral margins per side. Surstylus with seven peg-like prensisetae. Hypandrium with a pair of paramedian setae and pubescence medially. Paramere with seven sensilla medially and pubescence distally. Aedeagus lacking pubescence.

Female terminalia (Fig. 13E ): oviscapt with one subapical trichoid ovisensillum, 16, 11 and 5 peg-like ovisensilla per side on ventral, dorsal and apical margins, respectively.

Measurements [holotype (paratypes range in 2♂, 4♀), in mm]: BL = 3.38 (2.86-3.33, 2.86-3.29), ThL = 1.60 (1.47-1.64, 1.33-1.56), WL = 3.33 (3.20-3.29, 2.67-3.33), WW = 1.29 (1.20-1.24, 1.07-1.33).

Indices: arb = 4/3 (4/3), avd = 1.00 (0.88-1.43), adf = 2.67 (3.20-4.00), flw = 1.67 (1.83-3.00), FW/HW = 0.42 (0.41-0.47), ch/o = 0.13 (0.05-0.13), prorb = damaged (0.46-0.64), rcorb = damaged (0.27-0.36), vb = 1.00 (0.50-1.00), dcl = 0.77 (0.55-0.69), presctl = 0.44 (0.28-0.43), sctl = damaged (0.88-1.18), sterno = 0.73 (0.56-0.92), orbito = 0.56 (0.44-0.56), dcp = 0.47 (0.40-0.50), sctlp = 0.94 (0.86- 1.00), C = 2.11 (2.20-2.59), 4c = 1.23 (0.90-1.18), 4v = 2.15 (2.11-2.29), 5x = 1.80 (1.67-2.20), ac = 2.37 (2.43-2.57), M = 0.68 (0.50-0.65), C3F = 0.96 (0.89-0.96).

Etymology.

A combination of the Latin words: " niger " + " costa ", referring to the black pleura.

Distribution.

China (Yunnan).

Figures

Figure 5. Head, mesonotum, scutellum, pleura and abdomen of male. A-D S. melanogaster sp. n. E-H S. nigricostata sp. n. Scale bars 1 mm.

Figure 13. Scaptodrosophila nigricostata sp. n. A, B epandrium, surstylus and cercus (lateral and posterior views) C, D hypandrium, parameres, gonopods, aedeagus and aedeagal apodeme (ventral and lateral views) E oviscapt (lateral view). Scale bars 0.1 mm.