Stegana (Steganina) iaspidea Zhang & Chen

WANG, YA-LIAN, LI, BING-XUE, CUI, MENG-DI, ZHANG, YUAN, WANG, LE, ZHANG, CAI-HONG, TSAUR, SHUN-CHERN, CHEN, HONG-WEI & HUANG, JIA, 2023, Revision of the subgenus Stegana (Steganina) from China, with assessment of species delimitation using DNA barcodes (Diptera, Drosophilidae), Zootaxa 5250 (1), pp. 1-109 : 38-40

Stegana (Steganina) iaspidea Zhang & Chen , sp. nov.

( Figs. 4A, 4B , 15 )

Diagnosis. This species closely resembles S. (S.) langufoliacea in the shape of male terminalia (as figs. 16–22 in Wu et al. 2010, Fig. 15 ), but can be distinguished from the latter by having the articulating plate of aedeagus (aaed in Fig. 15C) with several minute, serrated processes along outer margin; aedeagus with several minute, serrated processes medially and some pubescence apically (Fig. 15B, C).

Description. Male and female: First flagellomere entirely black. Clypeus yellow. Mesonotum brown, with 4 yellow longitudinal stripes posterolaterally ( Fig. 4A ). Katepisternum yellowish ( Fig. 4B ). Scutellum brown, yellow at tip ( Fig. 4A ). Halter brown basally, grey distally ( Fig. 4B ). Fore femur with a row of 7 or 8 strong setae on distal part of posteroventral surface. Abdominal tergites dark brown ( Fig. 4A, B ); sternites brown, about 2 times as wide as long. Male terminalia ( Fig. 15A–F ): Epandrium with ca. 14 setae on dorsal to posterior portions per side ( Fig. 15A ). Surstylus slightly squared, with some minute, serrated processes on outer surface, 1 peg-like tooth (prensiseta in McAlpine 1981) and several setulae near distal margin, lacking pubescence ( Fig. 15A ). Cercus with much pubescence ( Fig. 15A ). Hypandrium slightly expanded anteromedially ( Fig. 15B, C ). Pregonite (paramere in McAlpine 1981) blurry or absent ( Fig. 15B, C ). Aedeagus subbasally expanded in ventral view, with 6 serrate-like processes per side ( Fig. 15B, C ). Aedeagal sheath (gonopod in McAlpine 1981) apically rounded and slightly dorsad curved, with several minute, serrated processes ( Fig. 15D, E ). Subepandrial sclerite slightly rounded distally ( Fig. 15F ). Female terminalia ( Fig. 15G–I ): Epiproct, cercus, and hypoproct with numerous setae and much pubescence ( Fig. 15G, I ). Eighth sternite mostly glabrous, with a few setae near posterolateral corner ( Fig. 15H ).

Measurements and indices. BL = 3.14 mm in holotype (2.46–3.21 in 5♂, 2.87–3.46 in 5♀ paratypes), ThL = 1.32 mm (1.20–1.45 in ♂, 1.20–1.47 in ♀), WL = 2.75 mm (2.21–2.86 in ♂, 2.00– 2.64 in ♀), WW = 1.35 mm (1.01–1.41 in ♂, 1.07–1.29 in ♀), arb = 9/4 (8–9/5–6), avd = 0.94 (0.60–0.92), adf = 1.33 (1.11–1.83), flw = 2.87 (2.14–2.99), FW/HW = 0.32 (0.30–0.44), ch/o = 0.27 (0.19–0.26), prorb = 1.09 (1.00–1.27), rcorb = 0.57 (0.50–0.81), vb = 0.62 (0.56–0.71), dcl = 0.68 (0.41–0.68), presctl = 0.54 (0.45–0.71), sctl = damaged (1.40–1.90), sterno = 0.81 (0.75–1.25), orbito = 1.42 (1.37–1.89), dcp = 0.38 (0.17–0.36), sctlp = 1.14 (1.09–1.42), C = 2.04 (1.71–2.06), 4c = 1.08 (1.00–1.29), 4v = 1.75 (1.50–1.81), 5x = 1.37 (1.18–1.54), ac = 12.38 (9.04–13.05), M = 0.61 (0.43–0.67), C3F = 0.73 (0.50–0.74).

Type materials. Holotype ♂ ( SCAU, No. 125186, DNA #1346), CHINA: Wangtianshu, Mengla , Yunnan, 21°36'09''N, 101°35'06''E, alt. 600m, 30.ix.2011, ex tree trunk, H.W. Chen . Paratypes: 1♂, 2♀ ( SCAU, Nos.125187– 89, DNA #1904), Yixiang, Pu'er , Yunnan, 22°44'19''N, 101°07'01''E, alt. 1400m, 2.x.2011, ex tree trunks, H.W. Chen; 3♂, 8♀ ( SCAU, Nos. 125190–200, DNA #2670, 2748), Longtan Park, Ximeng, Yunnan, 22°38'55''N, 99°36'02''E, alt. 1140m, 17.iv.2018, ex tree trunks, H.W. Chen, L. Gong, Y. Lin; 1♂ ( SCAU, No. 125201, DNA #2629), Menglun , Mengla , Yunnan, 21°47'29''N, 101°22'59''E, alt. 560m, 19.xii.2017, ex tree trunk, H.W. Chen.

Distribution. China (Yunnan).

Etymology. From the Latin word " iaspideus " (= jasper), referring to Yunnan, which is also known as “Emerald City''.

Figures

FIGURE 15. Stegana (Steganina) iaspidea Zhang & Chen, sp. nov., male (A–F) and female terminalia (G–I). A. Epandrium (epand), surstylus (sur), and cercus (cerc) in lateral view; B, C. Hypandrium (hypd), aedeagus (aed), articulating plate of aedeagus (ap aed), and phallapodeme (phap) in ventral and lateral views; D, E. Aedeagal sheath in ventral and lateral views; F. Subepandrial sclerite in ventral view; G. Epiproct and cercus in dorsal view; H. Eighth sternite in ventral view; I. Hypoproct in ventral view. Scale bars: 0.1 mm (the same as below).

FIGURE 1-4. An un-rooted, neighbor-joining (NJ) tree constructed using 435 DNA barcode sequences of 102 Steganina species. Numbers around the nodes are bootstrap percentages (BPs). BPs lower than 50 are not shown. The bars indicate the estimated number of substitutions per site.