Stegana (Oxyphortica) latipenis, 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 : 44-45

Stegana (Oxyphortica) latipenis , new species

( Figs. 1–4 )

Material examined. – Holotype: male, CHINA, Bubang (21 ° 28'N 101 ° 38'E), Mengla, Xishuangbanna , Yunnan, alt. 700 m, coll. Hongwei Chen, 11 Sep.2002 ( KIZ).

Paratypes: 2 males, same data as holotype ( SCAU). Diagnosis. – Surstylus somewhat oblong, basally with ca. 3 long bristles, distally densely setigerous ( Fig. 2 ); paramere very small, with 2 small sensilla; aedeagus basally expanded, apically round ( Fig. 3 ); gonopod large, submedially with 2 processes ( Figs. 3, 4 ) .

Description. – Male. Head: Eyes brownish red. Ocellar triangle dark brown. Postocellar seta small. Frons and frontoorbital plate brown, with several minute interfrontal setulae. Pedical yellowish brown, with 2 long setae and several minute setulae; first flagellomere grayish yellow, apically narrowing. Face yellow; facial carina slightly prominent. Clypeus grayish brown. Gena yellowish brown, anteriorly darker. Postgena narrow, linear. Palpus yellow, with 4 long setae and several minute setulae.

Thorax: Mesoscutum yellowish brown; acrostichal setulae in ca. 10 irregular rows. Scutellum yellowish brown, marginally slightly dark. Basal scutellar setae divergent; apical scutellar setae crossed. Postpronotal lobe grayish yellow, with 1 long seta. Thoracic pleura grayish brown, with broad, brown, longitudinal stripe above. Katepisternum with 3 setae, of which the medial one is the shortest.

Wing: Yellowish brown, paler basally and posteriorly. Veins dark brown. Costal vein between R 2+3 and R 4+5 with ca. 6 peg-like spinules on ventral surface. R 2+3 and R nearly straight. M 1 distally weakly convergent to R 4+5. Basal medialcubital crossvein present. Halter grayish yellow, basally slightly brownish.

4+5

Legs: Yellow, slightly darker at knee joints. Midleg tibiae proximally with 2 stout, long posterior setae. Preapical dorsal setae on all legs; apical setae only on midlegs. Midleg tarsi ventrally with 2 rows and hindleg tarsi ventrally with 1 row of minute cuneiform bristles. Fore- and midleg metatarsi as long as the three succeeding tarsal segments together; hindleg metatarsus slightly shorter than the three succeeding together.

Abdomen: All tergites mostly grayish brown; second to sixth tergites yellow along anterior margin. Sternites yellow.

Male terminalia: Epandrium broad below, pubescent except for anterior and ventral margins, lacking apodeme on anterior margin ( Fig. 1 ). Cercus separate from epandrium, narrow, setigerous but lacking pubescence ( Fig. 1 ). Surstylus small, without prensisetae ( Fig. 2 ). Hypandrium broad, medially slightly constricted. Gonopods partially covering aedeagus, basolaterally contiguous to hypandrium. Aedeagus basally with short, thick, densely distributed, hair.

Measurements: BL = 3.35 mm in holotype, range in 2 male paratypes: (2.55-2.75); ThL = 1.58 mm (1.16-1.34), WL = 2.65 mm (2.15-2.20); WW = 1.16 mm (0.98-1.02).

Indices: arb = 8/5 (6-7/3-5), avd = 1.00 (1.00), adf = 2.78 (2.22-2.60), flw = 2.22 (1.89-2.10), FW/HW = 0.35 (0.37), ch/o = 0.09 (0.06-0.07), prorb = 1.21 (0.83-0.94), rcorb = 0.66 (0.59-0.61), vb = 0.62 (0.45-0.50), dcl = 0.47 (0.41-0.45), presctl = 0.51 (0.50-0.51), sctl = 1.17 (1.25), sterno = 0.72 (0.89-0.90), orbito = 1.22 (1.38-1.78), dcp = 0.24 (0.23-0.24), sctlp = 1.00 (1.00), C = 2.76 (2.56-2.70), 4c = 0.83 (0.82- 0.86), 4v = 1.83 (1.67-1.86), 5x = 1.73 (1.55-1.60), ac = 6.44 (6.00), M = 0.54 (0.52-0.57), C3F = 1.00 (1.00).

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

Distribution. – China (Yunnan).

Remarks. – This species is very similar to S. (O.) adentata with regard to the bilobed gonopod and broad hypandrium, but can be distinguished from it by the paramere and the aedeagus (in adentata the paramere is absent and the aedeagus is basally rounded).

Figures

Figs. 1–4. Stegana (Oxyphortica) latipenis, new species, male genitalia: 1, epandrium and cercus (lateral view); 2, surstylus (frontal view); 3, hypandrium, gonopod, paramere, aedeagus and aedeagal apodeme (ventral view); 4, ditto (lateral view). Scale bar = 0.1 mm.