Stegana (Steganina) diodonta, Wang & Lu & Zhang & Chen, 2021, 2021

Wang, Ya-Lian, Lu, Jin-Ming, Zhang, Yuan & Chen, Hong-Wei, 2021, Molecular phylogeny, species delimitation and biogeographic history of the Stegana (Steganina) shirozui species group (Diptera: Drosophilidae) from East Asia, Zoological Journal of the Linnean Society 192, pp. 998-1016 : 1006-1008

STEGANA (STEGANINA) DIODONTA ZHANG & CHEN

( FIGS 4C, D , 6 )

Zoobank registration: u r n: l s i d: z o o b a n k. org:act: 8564947E-EF72-402E-884C-626245C25296

Holotype: ♂ ( SCAU, No. 124169), China: Kangping, Jiangcheng , Yunnan, 22.617°N, 101.455° E, 940 m a.s.l., 13.v.2012, tree trunk, J. J. Gao.

Paratype: China: 1♀ ( SCAU, No. 121892), Mengdong, Cangyuan , Yunnan, 23.167°N, 99.233°E, 1320 m a.s.l., 6.v.2016, tree trunk, J. Huang .

Etymology: The epithey is composed of the Greek δύο, two, and οδόντι, tooth, referring to the surstylus with two prensisetae.

Diagnosis: This species is unique in the shirozui group in having the mesoscutum and scutellum predominantly yellow, laterally with brownish longitudinal strips on mesoscutum ( Fig. 4C, D ), and surstylus with two prensisetae submedially ( Fig.6A, B ). In other species of this group, the mesoscutum is usually dark brown to black, laterally with yellow longitudinal strips ( Fig. 4A, G ).

Measurements: BL = 3.33 mm in holotype (4.13 in paratype), THL = 1.47 mm (1.80), WL = 2.67 mm (3.00), WW = 1.33 mm (1.33), arb = 8/6 (8/5), avd = 0.85 (0.67), adf = 2.17 (1.71), flw = 2.17 (2.43), FW/ HW = 0.38 (0.47), ch/o = 0.12 (0.17), prorb = 1.06 (in ♂ not counted due to damage), rcorb = 0.61 (in ♀ not counted due to damage), vb = 0.39 (0.26), dcl = 0.52 (0.40), presctl = 0.60 (0.42), sctl = 2.00 (2.00), sterno = 1.12 (1.00), orbito = 2.00 (1.71), dcp = 0.23 (0.23), sctlp = 1.54 (1.47), C = 2.35 (2.33), 4c = 1.05 (1.02), 4v = 2.05 (1.82), 5x = 1.11 (1.47), ac = 6.67 (9.20), M = 0.53 (0.49), C3F = 0.78 (0.87).

Description

Male and female. Head: Frons yellow above, brown below. First flagellomere yellow, black on distal third. Clypeus brownish. Palpus yellow.

Male terminalia ( Fig. 6 ): Epandrium slightly broadened on posterior margins, more than half as wide as long, ventrally slightly protruded. Cercus lacking pubescence. Paramere with two sensilla. Opening of aedeagus nearly oblong in ventral view, lateral parts lacking serrated processes. Gonopods posteromedially concave in ventral view, dorsomedially protruded in lateral view.

Figures

Figure 4. Habitus ofholotypes.A,B.Stegana (Steganina) alianya sp. nov.; C, D. Stegana (Steganina) diodonta sp. nov.; E, F. Stegana (Steganina) zebromyia sp. nov.; G, H. Stegana (Steganina) zopheria sp. nov.

Figure 6. Stegana (Steganina) diodonta sp. nov.A.epandrium, cercus and surstylus (lateral view); B. surstylus (ventral view); C, D. hypandrium, parameres (pm), aedeagus and aedeagal apodeme (ventral and lateral views); E, F. gonopods (ventral and lateral views). Scale bars: 0.1 mm.