Stegana (Oxyphortica) prigenti, 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 : 32-33

Stegana (Oxyphortica) prigenti , new species

( Figs. 7-10 )

Material examined. – Holotype - male, CHINA: Yexianggu, Mengyang, Xishuangbanna , Yunnan, coll. H. - w. Chen , 9 Sep.2002 ( KIZ).

Paratypes – CHINA: 2 males, 13 females, same data as holotype expect for 13, 14 Sep.2002 (1 male, 3 females: SCAU; 7 females: KIZ; 1 male, 3 females: SEHU) . THAILAND: 1 male, 1 female, Khao Yai, coll. S. Prigent, 8 Jun.1997 ( NMNH) .

Diagnosis. – Paramere apically pointed with 1 small fissure ( Fig. 9 ); surstylus with ca. 4 rows of scale-shaped processes basally ( Fig. 8 ).

Description. – Thorax: Mesonotum submedially and laterally with black longitudinal stripes, 2 per side; submedial stripes converge on prescutum. Pleura with 2 longitudinal stripes: upper one long below wing, the lower short on katepisterum.

Wing: Dark brown, yellow along posterior margin. Halter: stalk grey; apical part white.

Legs: Mid tibia basally with 2 (mostly) -3 (sometimes) long, strong postero-dorsal setae.

Abdominal tergites mostly yellow, with narrow, black band on lateral and posterior margins. Sternites black, yellow on lateral margins.

Male terminalia: Epandrium constricted mid-dorsally, with 1 row of long, strong setae and several short setae along posterior margin ( Fig. 7 ). Hypandrium with 1 flap posterolaterally ( Fig. 9 ). Paramere with serrated processes intersubbasally ( Fig. 10 ), medially with 1 sclerotized projection ( Fig. 9 ). Aedeagus broadly separated apically ( Fig. 10 ).

Measurements: BL = 6.50 mm (holotype) range in 3 males and 3 females paratypes: 5.90-6.70 (male), 5.30-7.55 (female); ThL = 2.80 mm (2.50-2.90 male, 2.40-3.10 female); WL = 5.00 mm (4.70-5.10 male, 4.50-6.00 female); WW = 1.80 mm (1.70-1.90 male, 1.60-2.00 female).

Indices: arb = 10/8 (10-11/7-8), avd = 0.95 (0.85-0.95), adf = 3.00 (3.00-3.20), flw = 2.60 (2.50-2.60), FW/HW = 0.40 (0.40-0.45), ch/o = 0.06 (0.06), prorb = 0.90 (0.85-0.90), rcorb = 0.65 (0.60-0.70), vb = 0.40 (0.50), dcl = 0.55 (0.50-0.60), presctl = 0.70 (0.70-0.75), sctl = 0.90 (0.90-1.00), sterno = 0.90 (0.90-0.95), orbito = 1.10 (1.10-1.20), dcp = 0.20 (0.20- 0.23), sctlp = 1.20 (1.20-1.30), C = 2.77 (2.66-2.78), 4c = 0.73 (0.62-0.75), 4v = 1.24 (1.13-1.30), 5x = 0.50 (0.40-0.50), ac = 5.00 (4.20-5.25), M = 0.17 (0.15-0.17), C3F = 1.00 (1.00).

Etymology. – The specific name is in honor of Dr. S. Prigent of the Drosophila Genetic Resource Center , Kyoto Institute of Technology, Japan (KITJ).

Distribution. – China (Yunnan), Thailand.

Remarks. – This species resembles S. (O.) nigripennis in the same characters, but can be clearly distinguished from the latter by paramere inter-subbasally with serrated processes and medially with 1 sclerotized projection, and surstylus with ca. 4 rows of scale-shaped processes basally (they are absent in nigripennis ).

Figures

Figs. 7-10. Stegana (Oxyphortica) prigenti, 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).