Scaptodrosophila undulata, 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 : 181-182

Scaptodrosophila undulata sp. nov.

( Figs 5A–C , 12 )

Diagnosis. This species resembles S. angustifolia sp. nov. in body colour patterns ( Fig. 5C ), but can be distinguished from it by surstylus curved inward in posterior view ( Fig. 12A ); hypandrium lacking a pair of paramedian hypandrial bristle ( Fig. 12C, D ). This species exhibits the closest genetic affinity to S. longiciliata in light of divergence in COI barcodes ( Table 2 ).

Description. Head ( Fig. 5A ): Eyes brownish red. Ocellar triangle dark brown to black. Frons brown to dark brown. Anterior reclinate orbital setae usually outside and close to proclinate orbital setae; posterior reclinate orbital seta larger than others. Pedicel and first flagellomere brown to dark brown. Facial carina brown to dark brown. Face brown to dark brown. Clypeus brown to dark brown. Palpus yellowish to yellowish brown. Vibrissa prominent; subvibrissal setae small. Gena and postgena narrow.

Thorax ( Fig. 5B, C ): Mesonotum black brown to black. Acrostichal setulae in ca eight regular rows. Scutellum black brown to black. Pleura dark brown to dark.

Abdomen ( Fig. 5B, C ): All tergites brown to dark brown.

Male terminalia ( Fig. 12A–D ): Epandrium with ca. 6 epandrial bristles near posterior and ventral margins per side. Surstylus with 10 peg-like surstylar teeth caudal margins ( Fig. 12A, B ). Hypandrium lacking hypandrial hairs. Pregonite with 3 sensilla medially. Postgonite weak. Phallus lacking pubescence ( Fig. 12C, D ).

Female terminalia ( Fig. 12E ): Oviscapt expanded subapically, apically elliptic. Oviscapt narrow with 16 peglike ovisensilla per side on ventral margins.

Measurements. BL = 2.27 mm in holotype (mm in 2♂ and 3♀ paratypes: 2.20–2.74 in ♂, 2.14–2.47 in ♀), ThL = 0.93 mm (0.93–1.20 in ♂, 1.07–1.13 in ♀), WL = 2.33 mm (2.33–2.40 in ♂, 2.27–2.67 in ♀), WW = 0.87 mm (0.93– 0.93 in ♂, 0.73–0.93 in ♀), arb = 4/2 (4/2), avd = 0.86 (0.75–1.00), adf = 2.33 (1.75–2.00), flw = 2.00 (1.50–2.00), FW/HW = 0.22 (0.22–0.24), ch/o = 0.10 (0.06–0.13), prorb = 0.46 (0.31–0.56), rcorb = 0.38 (0.23– 0.45), vb = 0.38 (0.38–0.50), dcl = 0.30 (0.26–0.35), presctl = 0.35 (0.32–0.50), sctl = 1.18 (1.11–1.33), sterno = 0.60 (0.50–0.75), orbito = 0.50 (0.43–0.67), dcp = 0.40 (0.27–0.36), sctlp = 1.00 (1.00–1.20), C = 1.56 (1.40–1.77), 4c = 1.50 (1.35–1.67), 4v = 2.50 (2.12–2.67), 5x = 2.80 (2.00–3.00), ac = 3.86 (3.57–3.75), M = 0.78(0.59–0.95), C3F = 0.67 (0.60–0.71).

Materials examined. Holotype ♂, ( SCAU, No. 125163), CHINA: Dupangling, Daoxian , Hunan, 25°48'N, 111°35'E, alt. 477m, 29.viii.2020, HE Peng . Paratypes: CHINA: 2♂, 3♀ ( SCAU, Nos. 125164, 125169–125172), same data as holotype ; 1♀, ( SCAU, No. 125165), Guposhan, Hezhou , Guangxi, 24°29'N, 111°34'E, alt. 790m, 29.vii.2017, HW Chen ; 3♂, 1♀ ( SCAU, Nos. 125166–67, 125173–74) Mulun, Huanjiang , Guangxi, 24°83'N, 108°26'E, alt. 749m, 16.ix.2015, HW Chen .

Distribution. China (Hunan, Guangxi).

Etymology. Etymology. From the Latin word: undulatus, referring to the surstylus curved inward.

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 12. Scaptodrosophila undulata 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.