Stegana convergens

Cheng, Yu, Xu, Miaofeng & Chen, Hongwei, 2010, The Stegana (Oxyphortica) convergens species group from the Oriental region (Diptera: Drosophilidae), Zootaxa 2531, pp. 57-63 : 57-58

Stegana convergens species group

Diagnosis. Surstylus dorsally with 1–2 sclerotized and pointed prensiseta(e) ( Figs 2 , 6 , 10 ); parameres small, fused basally ( Figs 2, 3 , 7, 8 , 11, 12 ); aedeagus with tentacle-like processes apically ( Figs 2, 3 , 7, 8 , 11, 12 ); each gonopod basally fused, distally separated into 2 lobe-like processes: ventral process bearing dense hair along margins; dorsal process curved dorsad, more or less pointed apically ( Figs 4 , 8 , 12 ).

Description. Male and female: Eyes brownish red. Ocellar triangle dark brown to black, without small setae around ocellar setae. Postocellar seta small. Frons and fronto-orbital plate brown to dark brown, with minute interfrontal setulae. Pedicel brown, with 2 long setae and several minute setulae; first flagellomere grayish brown. Carina slightly prominent in upper part. Gena narrow, linear. Palpus yellow, with 3–4 long setae and several minute setulae.

Mesoscutum almost yellow, with ca. 10 irregular rows of acrostichal setulae. Postpronotal lobe grayish yellow, with 1 long seta. Basal scutellar setae divergent; apical scutellar setae crossed. Pleura with broad, brown, longitudinal stripe above (running from propleuron to base of halter). Katepisternum with 3 setae, of which medial one shortest. Wing grayish brown, dark brown on distal part of anterior margin. Veins dark brown. Costal vein between R2+3 and R4+5 with 4–6 peg-like spinules on ventral surface. Veins R2+3 and R4+5 nearly straight. Vein M1 distally weakly convergent to vein R4+5. Basal medial-cubital crossvein present. Halter grayish yellow, basally slightly brownish. Legs yellowish. Midleg tibia basodorsally with 2 long setae. Preapical dorsal setae on all tibiae; apical setae only on fore and mid tibiae. Midleg tarsi ventrally with 2 rows and hindleg tarsi ventrally with 1 row of minute cuneiform bristles. Fore- and midleg basitarsi as long as the 3 succeeding tarsal segments together; hindleg basitarsus slightly shorter than the 3 succeeding segments together.

Male terminalia: Epandrium broad, lacking developed apodeme on anterior margin, with pubescence posterodorsally and dense setae on posterior margin ( Figs 1 , 5 , 9 ). Cercus separate from epandrium, narrow, setigerous, but lacking pubescence ( Figs 1 , 5 , 9 ). Surstylus broad basally, with slender setae along margin ( Figs 2 , 6 , 10 ). Hypandrium semicircularly expanded anteromedially ( Figs 3 , 7 , 11 ). Aedeagus slender, fused with aedeagal apodeme, almost concealed within gonopods ( Figs 4 , 8 , 12 ).

Figures

FIGURES 1 – 4. Stegana (Oxyphortica) mediospinosa sp. nov. 3. 1. Epandrium, cercus and surstylus (lateral view); 2. Surstylus (ventral view); 3, 4. Hypandrium, parameres, gonopods, aedeagus and aedeagal apodeme (ventral and lateral view). Scale lines = 0.1 mm.

FIGURES 5 – 8. Stegana (Oxyphortica) apicopubescens sp. nov. 3. 5. Epandrium, cercus and surstylus; 6. Surstylus; 7, 8. Hypandrium, parameres, gonopods, aedeagus and aedeagal apodeme. Scale lines = 0.1 mm.

FIGURES 9 – 12. Stegana (Oxyphortica) apicosetosa sp. nov. 3. 9. Epandrium, cercus and surstylus (lateral view); 10. Surstylus (ventral view); 11, 12. Hypandrium, parameres, gonopods, aedeagus and aedeagal apodeme. Scale lines = 0.1 mm.