Stegana (Steganina) stachydifolia, 2019

Li, Bingxue, Zhang, Yuan & Chen, Hongwei, 2019, Nine new species of the subgenus Stegana (Steganina) from China, with DNA barcoding information (Diptera: Drosophilidae), Zootaxa 4576 (1), pp. 81-108 : 97-98

Stegana (Steganina) stachydifolia sp. nov.

( Figs 2F , 9 )

Diagnosis. This species resembles S. malanostoma Chen & Chen, 2008 from Hubei, China in the colour patterns of body ( Fig. 2F ) and some characters of male terminalia ( Fig. 9 ), but can be distinguished by the aedeagus with 1 pair of fringe-like processes ventrally ( Fig. 9C, D ); gonopods slightly protruded dorsomedially, with a few serrated, minute processes ( Fig. 9E, F ). The minimum interspecific genetic distance to S. malanostoma is 3.4%, which is smaller than to other species ( Table 2).

Description. Male: Frons black on upper half, with 1 yellow band medially, brown below. First flagellomere yellow on basal 2/3, black on distal 1/3. Clypeus black medially, yellow laterally. Palpus yellow, slightly brownish apically. Mesonotum brown medially, yellowish brown laterally ( Fig. 2F ). Katepisternum entirely white. Scutellum brown ( Fig. 2F ). Foreleg femur with 4 long suberect setae near distal part of posteroventral surface. Abdominal tergites entirely brown ( Fig. 2F ). Male terminalia ( Fig. 9 ): Epandrium with ca. 24 setae on dorsal to posterolateral portion per side. Cercus lacking pubescence. Surstylus distally with numerous setulae on inner surface. Paramere with ca. 2 setulae. Aedeagus with numerous, thin setae along apical margin and serration processes on dorsal portion. Gonopods with 1 small projection distodorsally in lateral view.

Measurements. BL = 2.80 mm in holotype (4♂ paratypes: 2.47–2.67), ThL = 1.33 mm (1.11–1.58), WL = 2.20 mm (1.87–2.00), WW = 1.01 mm (0.87–1.00), arb = 7/4 (7/4–8/4), avd = 0.75 (0.50–0.67), adf = 1.60 (1.43– 1.80), flw = 2.4 (1.57–2.20), FW/HW = 0.41 (0.40–0.44), ch/o = 0.10 (0.10–0.12), prorb = 0.94 (0.93–1.07), rcorb = 0.63 (0.71–0.79), vb = 0.30 (0.26–0.36), dcl = 0.48 (0.44–0.63), presctl = 0.40 (0.45–0.53), sctl = 1.60 (1.61– 1.75), sterno = 0.79 (0.75–0.83), orbito = 1.82 (1.50–1.80), dcp = 0.23 (0.22–0.24), sctlp = 2.5 (2.67–3.3), C = 2.06 (2.00–2.07), 4c = 0.89 (0.79–1.07), 4v = 1.42 (1.21–1.79), 5x = 1.16 (1.16–2.00), ac = 8.5 (7.5–8.5), M = 0.37 (0.41–0.43), C3F = 0.71 (0.66–0.84), A = 1.17(1.03–1.17), H = 0.17(0.17–0.22).

Specimens examined. Holotype ♂ ( SCAU, No. 121491), China: Yixiang, Pu'er , Yunnan, 22°42'N, 101°09'E, altitude 1400m, 2.x.2011, tree trunk, HW Chen . Paratypes: 3♂ ( SCAU, Nos 121492 –94), 13.v.2012, same data as holotype ; 1♂ ( KIZ, No. 0090662), Guanlei, Mengla , Yunnan, 21°37'39''N, 101°9'55''E, altitude 670m, 14.ix.2012, tussock, JJ Gao ; 1♂ ( SCAU, No. 124705), Husa, Longchuan , Yunnan, 24°27'37''N, 97°45'9''E, altitude 1227m, 7.ix.2017, tree trunk, HW Chen .

Etymology. From the Greek word: stachydifolius, referring to the aedeagus with 1 pair of fringe-like processes.

Distribution. China (Yunnan).

Figures

FIGURE 2. Habitus. A. Stegana (Steganina) toyaensis Okada & Sidorenko, 1992; B–J in holotype: B. Stegana (Steganina) latitabula sp. nov.; C. Stegana (Steganina) panda sp. nov.; D. Stegana (Steganina) pinguifoliacea sp. nov.; E. Stegana (Steganina) spatulata, sp. nov.; F. Stegana (Steganina) stachydifolia, sp. nov.; G. Stegana (Steganina) hirtifoliacea sp. nov.; H. Stegana (Steganina) unguiculata sp. nov.; I. Stegana (Steganina) biflava sp. nov.; J. Stegana (Steganina) flavivittata sp. nov.

FIGURE 9. Stegana (Steganina) stachydifolia sp. nov., male terminalia: A. Epandrium, surstylus and cercus (lateral view); B. Surstylus (inner view); C, D. Hypandrium, parameres, aedeagus and aedeagal apodeme (ventral and lateral views); E, F. Gonopods (ventral and lateral views); G. Tenth sternite (ventral view). Scale lines = 0.1 mm.