Scaptodrosophila apunctata, 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 : 176-177

Scaptodrosophila apunctata sp. nov.

( Figs 2D–F , 7 )

Diagnosis. This species differs from the other Chinese species in the coracina species group in the pattern on the abdomen tergites and male terminalia, but can be distinguished from them by hypandrium fused to pregonite apically, tubular-shaped on inner surfaces; phallapodeme (aedeagal apodeme in McAlpine 1981) recurved ( Fig. 7C, D ); tergites lacking black band ( Fig. 2E, F ). This species exhibits the closest genetic affinity to S. ventriobscurata in light of divergence in COI barcodes ( Table 2 ).

Description. Head ( Fig. 2D ): Frons brown. Pedicel hazel. First flagellomere yellowish brown. Facial carina yellowish brown, long, 1/2 the length of face.

Thorax ( Fig. 2E, F ): Mesonotum yellow. Pleura yellow.

Abdomen ( Fig. 2E, F ): Tergites yellow.

Male terminalia ( Fig. 7 ): Epandrium with ca. 8 epandrial bristles near posterior and ventral margins per side. Surstylus with 9 peg-like surstylar teeth on caudal margins ( Fig. 7A, B ). Hypandrium with a pair of paramedian hypandrial bristle. Pregonite with 5 sensilla medially. Postgonite roundly expanded, with pubescence apically. Phallus lacking pubescence ( Fig. 7C, D ).

Measurements. BL = 3.45 mm in holotype (mm in 4♂ paratypes: 2.98–3.29), ThL = 1.29 mm (1.07–1.33), WL = 3.02 mm (2.53–3.07), WW = 1.29 mm (0.98–1.29), arb = 3/2 (3/2), avd = 0.92 (0.67–0.92), adf = 2.60 (1.67–2.60), flw = 2.20 (1.83–2.20), FW/HW = 0.44 (0.40–0.47), ch/o = 0.23 (0.20–0.25), prorb = 0.71 (0.57–0.86), rcorb = 0.36 (0.36–0.39), vb = 0.70 (0.25–0.63), dcl = 0.50 (0.38–0.47), presctl = 0.69 (0.55–0.61), sctl = 1.03 (0.89–1.07), sterno = 0.83 (0.50–0.74), orbito = 0.44 (0.33–0.53), dcp = 0.24 (0.20–0.22), sctlp = 0.90 (0.92–1.42), C = 2.50 (2.52–2.93), 4c = 1.00 (0.90–1.00), 4v = 2.22 (2.06–2.16), 5x = 1.13 (0.71–1.13), ac = 1.80 (1.80–2.27), M = 0.20 (0.29–0.50), C3F = 0.72 (0.77–0.81).

Materials examined. Holotype ♂ ( SCAU, No. 125106), CHINA: Moli Forest Park, Ruili , Yunnan, 24°07'N, 97°58'E, alt. 922m, 23.iv.2018, HW Chen . Paratypes: CHINA: 4♂ ( SCAU, Nos. 125103–125105, 125107), Moli Forest Park, Ruili , Yunnan, 24°07'N, 97°58'E, alt. 922m, 23.iv.2018, HW Chen, L Gong, Y Lin .

Distribution. China (Yunnan).

Etymology. A combination of the Latin words “ absent ” + “ punctatus ”, referring to the tergites lacking bands.

Figures

FIGURE 2. External morphology.A–C. Scaptodrosophila angustifolia sp. nov. A. head, anterior view; B. habitus, dorsal view; C. habitus, lateral view. D–F. S. apunctata sp. nov. D. head, anterior view; E. habitus, dorsal view; F. habitus, lateral view. Scale bars = 0.5 mm.

FIGURE 7. Scaptodrosophila apunctata 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.