Scaptodrosophila curvata, 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 : 190-191

Scaptodrosophila curvata sp. nov.

( Figs 5D–F , 13 )

Diagnosis. Body yellowish brown ( Fig. 5E, F ); arista with five dorsal and four ventral branches in addition to terminal bifurcation ( Fig. 5D ); hypandrium triangle shaped in ventral view; phallapodeme curved in lateral view ( Fig. 13C, D ). This species exhibits the closest genetic affinity to S. latifoliacea sp. nov. in light of divergence in COI barcodes ( Table 2 ), but morphologically somewhat conflict with the diagnostic characters of the coracina species group.

Description. Head ( Fig. 5D ): Frons brown. Pedicel yellowish brown. First flagellomere grayish. Facial carina brown, short, 1/3 the length of face.

Thorax ( Fig. 5E, F ): Mesonotum yellow. Acrostichal setulae in ca. ten regular rows. Scutellum yellow. Pleura beige.

Abdomen ( Fig. 5E, F ): Tergites II to V yellow with black caudal bands, the caudal bands on tergites II to V interrupted medially.

Male terminalia ( Fig. 13 ): Epandrium with ca. 12 epandrial bristles near posterior and ventral margins per side. Surstylus with 8 peg-like surstylar teeth ( Fig. 13A, B ). Hypandrium with a pair of paramedian hypandrial bristle. Pregonite with 3 sensilla medially. Phallus lacking pubescence ( Fig. 13C, D ).

Measurements. BL = 2.58 mm in holotype (mm in 5♂ paratypes: 2.80–3.42), ThL = 0.87 mm (0.84–0.96), WL = 2.67 mm (2.58–2.89), WW = 1.09 mm (1.08–1.11), arb = 5/4 (5/4), avd = 0.94 (0.69–1.14), adf = 3.14 (2.80–3.20), flw = 2.75 (2.17–2.60), FW/HW = 0.36 (0.34–0.39), ch/o = 0.10 (0.09–0.13), prorb = 0.75 (0.50–0.87), rcorb = 0.36 (0.24–0.33), vb = 0.48 (0.32–0.51), dcl = 0.77 (0.47–0.48), presctl = 0.53 (0.52–0.52), sctl = 0.97 (0.73–0.97), sterno = 0.68 (0.68–0.74), orbito = 0.51 (0.36–0.41), dcp = 0.23 (0.21–0.31), sctlp = 0.94 (0.85–2.13), C = 2.91 (2.70–3.40), 4c = 0.88 (0.73–1.00), 4v = 1.60 (1.42–1.73), 5x = 0.88 (1.07–1.14), ac = 3.14 (2.11–3.29), M = 0.28 (0.63–1.14), C3F = 0.86 (0.83–0.90).

Materials examined. Holotype ♂ ( SCAU, No. 125126), CHINA: Mengma, Menglian , Yunnan, 22°12'N, 99°22'E, alt. 1050m, 14.iv.2018, HW Chen . Paratypes: CHINA: 3♂ ( SCAU, Nos. 125127, 125128, 125130), Mengma, Menglian , Yunnan, 22°12'N, 99°22'E, alt. 1050m, 14.iv.2018, HW Chen ; 1♂ ( SCAU, No. 125131), Moli Forest Park, Ruili , Yunnan, 24°07'N, 97°58'E, alt. 922m, 23.iv.2018, HW Chen ; 1♂ ( SCAU, No. 125129), Mengyuan, Mengla , Yunnan, 21°47'N, 101°22'E, alt. 876m, 18.xii.2017, HW Chen .

Distribution. China (Yunnan)

Etymology. From the Latin words “ curvi ”, referring to the phallapodeme curved in lateral view.

Figures

FIGURE 5. External morphology. A–C. Scaptodrosophila undulata sp. nov. A. head, anterior view; B. habitus, dorsal view; C. habitus, lateral view. D–F. S. curvata sp. nov. D. head, anterior view; E. habitus, dorsal view; F. habitus, lateral view. Scale bars = 0.5 mm.

FIGURE 13. Scaptodrosophila curvata 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). Scale bars = 0.1 mm.