Stegana (Steganina) melanostoma, Chen, Xi-Peng & Chen, Hong-Wei, 2008

Chen, Xi-Peng & Chen, Hong-Wei, 2008, The Stegana coleoptrata species group (Diptera: Drosophilidae) from mainland China, Zootaxa 1891, pp. 55-65 : 57-58

Stegana (Steganina) melanostoma sp. nov.

( Figs 1–6 )

Specimens examined. Holotype ɗ (SCAU, No. 120293), CHINA – labeled “Shennongjia, Hubei, 31°29' N, 110°18' E, 1700 m a.s.l., 1.viii.2005, on tree trunk, H.W. Chen”.

Etymology. A combination of the Greek words “melas + stoma”, referring to the black clypeus. Diagnosis. Tenth sternite (decasternum) roundly protruded dorsally, with pubescence distally ( Fig. 3 ); aedeagus with numerous furrows and serration processes distally ( Fig. 5 ); gonopods roundly vaulted ( Fig. 6 ).

Description. Male: Frons brown, shiny, with 1 black band and sporadic, minute setulae on lower part (above ptilinal fissure). Face black, with 1 yellow band medially; facial carina slight on upper part. First flagellomere almost yellow, black on distal 1/4. Clypeus almost black. Palpus yellow on basal 2/3, black on distal 1/3. Gena white-yellow. Scutum dark brown medially, brown laterally. Katepisternum entirely white. Scutellum entirely black. Wing dark grey-brown anteriorly, slightly paler posteriorly, not paler at tip. Legs white to yellowish, dark brown at fore knees, distal half of mid and hind femora and basal half of mid and hind tibiae. Fore femur with 4 strong suberect setae on distal part of ventral surface. Abdominal tergites dark brown. Male terminalia: Epandrium pubescent except for ventral margin, with ca. 26 setae on dorsal to posterolateral portion per side ( Fig. 1 ). Surstylus distally with numerous setae on outer surface ( Fig. 2 ). Tenth sternite strongly sclerotized basally ( Fig. 3 ). Cercus setigerous, lacking pubescence ( Fig. 1 ). Hypandrium anteromedially protruded and connected with base of aedeagus by articulating plate (median flaps, Figs. 4, 5 ). Paramere reduced, with ca. 2 setulae ( Figs. 4, 5 ). Aedeagus with thin tentacle-like setae along apical margin ( Figs. 4, 5 ).

Measurements. BL = 2.79 mm; ThL = 1.58 mm; WL = 2.63 mm; WW = 1.13 mm. Indices: arb = 7/6, avd = 0.71, adf = 1.55, flw = 1.64, FW/HW = 0.45, ch/o = 0.15, prorb = 1.11, rcorb = 0.90, vb = 0.44, dcl = damaged, presctl = damaged, sctl = damaged, sterno = 0.80, orbito = 1.86, dcp = 0.21, sctlp = 1.86, C = 2.01, 4c = 1.34, 4v = 1.83, 5x = 0.85, ac = 15.50, M = 0.38, C3F = 0.70.

Distribution. China (Hubei).

Figures

FIGURES 1 – 6. Stegana (Steganina) melanostoma sp. nov., male genitalia: 1. epandrium (epand), surstylus (sur) and cercus (cerc) (lateral view); 2. surstylus (ventral view); 3. 10 th sternite (ventral view); 4. hypandrium (hypd), paramere (pm), aedeagus (aed) and aedeagal apodeme (aed a) (ventral view); 5. ditto (lateral view); 6. gonopods (ventral view) (scale lines = 0.1 mm).