Scaptodrosophila polytricapillum, Peng & Lin & Chen, 2022

Peng, Hongen, Lin, Yong & Chen, Hongwei, 2022, Morphological and molecular evidence of eight new species of the genus Scaptodrosophila Duda (Diptera, Drosophilidae) from China, Zootaxa 5093 (2), pp. 169-194 : 180-181

Scaptodrosophila polytricapillum sp. nov.

( Figs 4D–F , 11 )

Diagnosis. This species resembles S. helvpecta Liu & Chen, 2018 in the pattern on the abdomen tergites and shape of surstylus, but can be distinguished from the latter by surstylus palm shaped in posterior view ( Fig. 11A ); postgonite large, expanded antrorsely, with pubescence basally ( Fig. 11C, D ). This species exhibits the closest genetic affinity to S. longiciliata in light of divergence in COI barcodes ( Table 2 ).

Description. Head ( Fig. 4D ): Frons dark brown. Pedicel brown. First flagellomere grayish. Facial carina hazel, short, 1/3 the length of face.

Thorax ( Fig. 4E, F ): Mesonotum brown. Scutellum brown. Pleura brown.

Abdomen ( Fig. 4E, F ): Tergites III to VI brown with dark brown caudal bands.

Male terminalia ( Fig. 11A–D ): Epandrium with ca. 15 epandrial bristles near posterior and ventral margins per side. Surstylus with 5 peg-like surstylar teeth on caudal margins ( Fig. 11A, B ). Hypandrium with a pair of paramedian hypandrial bristle. Phallus lacking pubescence ( Fig. 11C, D ).

Female terminalia ( Fig. 11E ): Oviscapt narrow with 1 long subapical trichoid ovisensillum, 18 peg-like ovisensilla per side on ventral margins. Ovisensilla dense at both ends, sparse in the middle.

Measurements. BL = 2.40 mm in holotype (mm in 1♂ and 1♀ paratypes: 2.62 in ♂, 2.58 in ♀), ThL = 1.56 mm (1.24 in ♂, 1.20 in ♀), WL = 2.76 mm (2.36 in ♂, 2.49 in ♀), WW = 1.02 mm (0.98 in ♂, 1.07 in ♀), arb = 3/2 (3/2), avd = 0.75 (0.73–0.92), adf = 2.67 (1.96–2.31), flw = 2.67 (2.28–2.29), FW/HW = 0.35 (0.27–0.33), ch/o = 0.14 (0.10–0.11), prorb = 0.54 (0.50–0.56), rcorb = 0.38 (0.38–0.41), vb = 0.61 (0.44–0.57), dcl = 0.48 (0.46–0.50), presctl = 0.66 (0.38–0.56), sctl = 0.71 (0.72–1.37), sterno = 0.92 (0.92–0.96), orbito = 0.39 (0.55–0.60), dcp = 0.28 (0.23–0.30), sctlp = 0.85 (0.86–0.92), C = 4.36 (4.08–4.80), 4c = 0.52 (0.50–0.55), 4v = 1.67 (1.50–1.70), 5x = 0.86 (0.88–1.14), ac = 1.38 (1.33–1.43), M = 0.29 (0.32–0.40), C3F = 0.73 (0.70–0.75).

Materials examined. Holotype ♂ ( SCAU, No. 125124), CHINA: Mengdong, Cangyuan , Yunnan, 23°10'N, 99°13'E, alt. 1323m, 6.v.2016, YQ Liu . Paratypes: CHINA: 1♂ ( SCAU, No. 125125), Muyiji, Ximeng , Yunnan, 22°37'N, 99°35'E, alt. 1203m, 30.iv.2016, YQ Liu ; 1♀ ( SCAU, No. 125123), Botanic Garden, Ruili , Yunnan, 24°01'N, 97°51'E, alt. 1154m, 22.iv.2018, HW Chen .

Distribution. China (Yunnan).

Etymology. A combination of the Latin word “ polytrichus ” + “ capillus ”, referring to the postgonite with pubescence basally.

Figures

FIGURE 4. External morphology. A–C. Scaptodrosophila melanovittata sp. nov. A. head, anterior view; B. habitus, dorsal view; C. habitus, lateral view. D–F. S. polytricapillum sp. nov. D. head, anterior view; E. habitus, dorsal view; F. habitus, lateral view. Scale bars = 0.5 mm.

FIGURE 11. Scaptodrosophila polytricapillum sp. nov., male terminalia: A, B. Epandrium, surstylus and cercus (posterior and lateral views); C, D. Hypandrium, phallus, phallapodeme, pregonite and postgonite (ventral and lateral views); E. Oviscapt (lateral view). Scale bars = 0.1 mm.