Stegana (Oxyphortica) aotsukai, Chen & Wang, 2004

Chen, Hong-wei & Wang, Bao-cheng, 2004, Stegana (Oxyphortica) Nigripennis Species-Group, With Descriptions Of Four New Species From Southeast Asia (Insecta: Diptera: Drosophilidae), Raffles Bulletin of Zoology 52 (1), pp. 29-36 : 31-32

Stegana (Oxyphortica) aotsukai , new species

( Figs. 3-6 )

Material examined. – Holotype male, CHINA: Mt. Wuyi, Fujian, 700 m, coll. H. - w. Chen , 17 Aug.2001 ( KIZ).

Paratypes - 2 males, 2 females, same data as holotype except for 15-19 Aug.2001 ( SCAU) .

Diagnosis. – Paramere narrowed distally, slightly hooked apically ( Figs. 5, 6 ); aedeagus with 1 curved, lobe-shaped process basally ( Fig. 5 ).

Description. – Thorax: Mesonotum yellow, with 3 black, longitudinal stripes per side: submedial and later stripes extend to prescutum; sublateral stripes short between scutal and scutellar sulci. Pleura yellow mostly, with 1 black, longitudinal stripe medially. Scutellum medially black, laterally yellow.

Wing: Dark brown. Halter greyish black.

Legs: Mid tibia basally with 2 long, strong postero-dorsal setae.

Abdomen: Second to fourth tergites yellow to dark yellow on anterior margin, with laterally and medially protruded, black band on posterior margin; fifth and sixth nearly entirely black. Sternites yellow.

Male terminalia: Epandrium not constricted mid-dorsally, with 1 row of long, strong setae and 2 rows of short setae along posterior margin ( Fig. 3 ). Surstylus with several setae on distal margin, and 1 hole near posterior margin ( Fig. 4 ). Aedeagus apically bifurcate ( Fig. 6 )

For morphological terminology and index definitions, see Chen & Toda (2001) or Chen & Aotsuka (2003).

Measurements: BL = 7.10 mm (holotype), paratypes range: 6.17 (male) to and 7.23 (female); ThL = 2.84 mm (2.64 male, 2.90 female); WL = 5.40 mm (5.33 male, 5.50 female); WW = 2.10 mm (2.00 male, 2.12 female).

Indices: arb = 10/7 (10-11/6-7), avd = 0.85 (0.85), adf = 2.20 (2.30), flw = 2.60 (2.50-2.60), FW/HW = 0.40 (0.40-0.45), ch/o = 0.07 (0.07), prorb = 0.90 (0.90-0.95), rcorb = 0.55 (0.55), vb = 0.40 (0.40), dcl = 0.55 (0.55-0.60), sctl = 0.80 (0.80), sterno = 1.00 (1.00), orbito = 2.00 (1.90-2.00), dcp = 0.20 (0.20-0.23), presctl = 0.70 (0.70-0.75), sctlp = 1.20 (1.20-1.30), C = 2.58 (2.56-2.60), 4c = 0.73 (0.70-0.75), 4v = 1.22 (1.13-1.20), 5x = 0.53 (0.50-0.54), ac = 4.71 (4.70- 4.75), M = 0.18 (0.15-0.17), C3F = 1.00 (1.00).

Etymology. – The specific name is in honor of Dr. T. Aotsuka of the Department of Biology, Tokyo Metropolitan University, Japan (TMUJ).

Distribution. – China (Fujian).

Remarks. – This species resembles S. (O.) nigripennis in the many characters, but can be clearly distinguished from the latter by paramere distally narrowed and aedeagus basally with 1 curved process (paramere distally broad and aedeagus basally without curved process in nigripennis ).

Figures

Figs. 3-6. Stegana (Oxyphortica) aotsukai, new species, male genitalia: 3. epandrium (epand) and cercus (cerc); 4. surstylus; 5. hypandrium (hypd), paramere (pm), gonopod (gon), aedeagus (aed) and aedeagal apodeme (aed a) (ventral view); 6. ditto (lateral view) (scale-line = 0.1 mm).