Stegana (Oxyphortica) acutipenis, Xu & Gao & Chen, 2007

Xu, Miao-Feng, Gao, Jian-Jun & Chen, Hong-Wei, 2007, Three New Species Of Stegana (Oxyphortica) From Yunnan Province, Southwestern China (Insecta: Diptera: Drosophilidae), Raffles Bulletin of Zoology 55 (1), pp. 43-47 : 45-46

Stegana (Oxyphortica) acutipenis , new species

( Figs. 5–8 )

Material examined. – Holotype: male, CHINA, Xishuangbanna Tropical Botanical Garden, Menglun , Yunnan, alt. 700 m, coll. Hong-wei Chen, 13 Sep.2002 ( SCAU) . Paratype 1 female, same data as holotype ( KIZ) .

Diagnosis. – Surstylus elongate, basally with ca. 6 long bristles, submedially slightly curved, distally setigerous ( Fig. 6 ); aedeagus basally round, medially broadened, apically narrowed, slightly sclerotized ( Figs. 7, 8 ).

Description. – Only those characters that differ from the species above are given in this description.

Male. Head: Pedical yellow, with 1 long seta and several minute setulae.

Wing: Costal vein between R 2+3 and R 4+5 with ca. 8 peg-like spinules on ventral surface.

Abdomen: All tergites mostly dark brown to black except for second to third tergites yellow along anterior margins.

Male terminalia: Epandrium with developed apodeme on anterior margin ( Fig. 5 ). Gonopod small lobe. Paramere absent.

Measurements: BL = 3.40 mm in holotype (4.05 mm in paratype); ThL = 1.56 mm (1.74); WL = 2.55 mm (2.95); WW = 1.18 mm (1.42).

Indices: arb = 8/6 (8/6), avd = 1.00 (1.00), adf = 2.27 (3.00), flw = 2.00 (2.40), FW/HW = 0.37 (0.36), ch/o = 0.07 (0.06), prorb = 1.17 (0.89), rcorb = 0.60 (0.66), vb = 0.45 (0.48), dcl = 0.46 (0.46), sctl = 1.05 (1.15), sterno = 0.73 (0.60), orbito = 2.00 (1.60), dcp = 0.27 (0.28), presctl = 0.55 (0.55), sctlp = 0.84 (0.93), C = 2.60 (3.12), 4c = 0.79 (0.77), 4v = 1.55 (1.84), 5x = 1.42 (1.46), ac = 6.00 (4.92), M = 0.45 (0.49), C3F = 1.00 (1.00).

Etymology. – A combination of the Latin words: “acutus” and “penis”, referring to the apically acute aedeagus.

Distribution. – China (Yunnan).

Remarks. – This species resembles S. (O.) latipenis and S. (O.) adentata in that the surstylus has basally a few long bristles. But it can be clearly distinguished from latipenis by referring to the diagnostic characters, and from adentata by the aedeagus (in adentata the aedeagus has subapically one pair of lobe-like processes).

Figures

Figs. 5–8. Stegana (Oxyphortica) acutipenis, new species, male genitalia: 5, epandrium and cercus (lateral view); 6, surstylus (frontal view); 7, hypandrium, gonopod, paramere, aedeagus and aedeagal apodeme (ventral view); 8, ditto (lateral view). Scale bar = 0.1 mm.