Scaptodrosophila trivittata, Liu & Chen, 2018

Liu, Yi-Qin & Chen, Hong-Wei, 2018, The genus Scaptodrosophila Duda part II: the coracina species group from East Asia, with morphological and molecular evidence (Diptera, Drosophilidae), ZooKeys 736, pp. 119-148 : 130-132

Scaptodrosophila trivittata sp. n.

Figs 6B, D, F , 14

Holotype.

♂ (SCAU, No. 110984): CHINA: Mengdong, Cangyuan, Yunnan, alt. 1323 m, 6.v.2016, J Huang, YQ Liu.

Paratypes.

CHINA: 2♂ (SCAU, Nos 110985, 86), same data as holotype.

Diagnosis.

This species is similar to S. fuscilimba sp. n. in the pattern on the abdomen tergites, but can be distinguished from the latter by having the tergites V, VI yellowish brown, and lacking dark brown caudal bands (Fig. 6D, F ); paramere triangle shaped in lateral view (Fig. 14C, D ); gonopods small, concave medially in lateral view, bilobed apically (Fig. 14C, D ); aedeagus rod-like, with pubescence, and broadened apically (Fig. 14C, D ).

Description.

(♂) Head (Fig. 6B ): Frons yellowish brown. Pedicel yellowish brown; first flagellomere yellowish, margins black. Facial carina yellowish, flat, 1/3 long as face.

Thorax (Fig. 6D, F ): Mesonotum yellowish brown. Acrostichal setulae in ca. ten regular rows. Prescutellar setae small. Scutellum yellowish brown. Pleura yellowish brown.

Abdomen (Fig. 6D, F ): Tergites II to IV yellow with dark brown caudal bands, the caudal bands narrowed dorsomedially; tergites V to VI yellow.

Male terminalia (Fig. 14 ): Epandrium with ca. 16 setae near posterior and ventral margins per side. Surstylus with nine peg-like prensisetae. Hypandrium lacking pubescence. Paramere with ten sensilla medially.

Measurements [holotype ♂ (range in 2♂paratypes), in mm]: BL = 2.00 (1.97-2.00), ThL = 0.83 (0.83), WL = 1.70 (1.70-1.93), WW = 0.67 (0.73-0.83).

Indices: arb = 4/2 (4/2), avd = 0.83 (0.83-1.00), adf = 2.00 (2.00), flw = 2.00 (2.00-2.33), FW/HW = 0.48 (0.50), ch/o = 0.13 (0.12-0.13), prorb = 0.86 (0.86), rcorb = 0.29 (0.29), vb = 0.30 (0.29-0.30), dcl = 0.46 (0.55), presctl = 0.38 (0.45), sctl = 1.17 (1.08), sterno = 0.50 (0.40), orbito = 0.38 (0.40-0.50), dcp = 0.33 (0.40-0.50), sctlp = 086 (1.00-1.17), C = 1.59 (1.59-1.88), 4c = 1.42 (1.23-1.42), 4v =2.17 (2.08-2.25), 5x = 3.00 (2.50), ac = 3.40 (2.67-3.40), M = 0.75 (0.77-0.83), C3F = 0.59 (0.59-0.69).

Etymology.

A combination of the Latin words tri and vittatus, referring to the three caudal bands on the tergites II to IV.

Distribution.

China (Yunnan).

Figures

Figure 6. Frontal, dorsal, and lateral views of male. Scaptodrosophila nigrolimbata sp. n. (A, C, E); S. trivittata sp. n. (B, D, F). Scale bars: 0.5 mm.

Figure 14. Scaptodrosophila trivittata sp. n. A and B epandrium, surstylus, and cercus (posterior and lateral views) C and D hypandrium, parameres, gonopods, aedeagus, and aedeagal apodeme (ventral and lateral views, respectively). Scale bars: 0.1 mm.